CfRadial1

import xarray as xr
from open_radar_data import DATASETS

import xradar as xd

Download

Fetching CfRadial1 radar data file from open-radar-data repository.

filename = DATASETS.fetch("cfrad.20080604_002217_000_SPOL_v36_SUR.nc")

xr.open_dataset

Making use of the xarray cfradial1 backend. We also need to provide the group.

ds = xr.open_dataset(filename, group="sweep_0", engine="cfradial1")
display(ds)

<xarray.Dataset> Size: 4MB
Dimensions:                    (azimuth: 483, range: 996)
Coordinates:
  * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
    elevation                  (azimuth) float32 2kB ...
    time                       (azimuth) datetime64[ns] 4kB ...
  * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
    latitude                   float64 8B ...
    longitude                  float64 8B ...
    altitude                   float64 8B ...
Data variables: (12/18)
    sweep_number               int32 4B ...
    sweep_mode                 <U20 80B ...
    prt_mode                   |S32 32B ...
    follow_mode                |S32 32B ...
    sweep_fixed_angle          float32 4B ...
    pulse_width                (azimuth) float32 2kB ...
    ...                         ...
    r_calib_index              (azimuth) int8 483B ...
    measured_transmit_power_h  (azimuth) float32 2kB ...
    measured_transmit_power_v  (azimuth) float32 2kB ...
    scan_rate                  (azimuth) float32 2kB ...
    DBZ                        (azimuth, range) float32 2MB ...
    VR                         (azimuth, range) float32 2MB ...

xarray.Dataset

• Dimensions:
  • azimuth: 483
  • range: 996
• Coordinates: (7)
  • azimuth
    (azimuth)
    float32
    0.0 0.75 1.5 ... 357.8 358.5 359.2

    standard_name :

    beam_azimuth_angle

    units :

    degrees

    array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],
          shape=(483,), dtype=float32)

  • elevation
    (azimuth)
    float32
    ...

    standard_name :

    beam_elevation_angle

    units :

    degrees

    positive :

    up

    [483 values with dtype=float32]

  • time
    (azimuth)
    datetime64[ns]
    ...

    standard_name :

    time

    long_name :

    time in seconds since volume start

    comment :

    times are relative to the volume start_time

    [483 values with dtype=datetime64[ns]]

  • range
    (range)
    float32
    150.0 300.0 ... 1.492e+05 1.494e+05

    standard_name :

    range_to_center_of_measurement_volume

    long_name :

    Range from instrument to center of gate

    units :

    meters

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    150.00000596046448

    meters_between_gates :

    150.00000596046448

    array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,
           149250.     , 149400.     ], shape=(996,), dtype=float32)

  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (18)
  • sweep_number
    ()
    int32
    ...

    standard_name :

    sweep_index_number_0_based

    [1 values with dtype=int32]

  • sweep_mode
    ()
    <U20
    ...

    standard_name :

    scan_mode_for_sweep

    options :

    sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

    [1 values with dtype=<U20]

  • prt_mode
    ()
    |S32
    ...

    standard_name :

    transmit_pulse_mode

    options :

    fixed, staggered, dual

    meta_group :

    radar_parameters

    [1 values with dtype=|S32]

  • follow_mode
    ()
    |S32
    ...

    standard_name :

    follow_mode_for_scan_strategy

    options :

    none, sun, vehicle, aircraft, target, manual

    meta_group :

    instrument_parameters

    [1 values with dtype=|S32]

  • sweep_fixed_angle
    ()
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [1 values with dtype=float32]

  • pulse_width
    (azimuth)
    float32
    ...

    standard_name :

    transmitter_pulse_width

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt
    (azimuth)
    float32
    ...

    standard_name :

    pulse_repetition_frequency

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt_ratio
    (azimuth)
    float32
    ...

    standard_name :

    pulse_repetition_frequency_ratio

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • nyquist_velocity
    (azimuth)
    float32
    ...

    standard_name :

    unambiguous_doppler_velocity

    units :

    meters per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • unambiguous_range
    (azimuth)
    float32
    ...

    standard_name :

    unambiguous_range

    units :

    meters

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • antenna_transition
    (azimuth)
    int8
    ...

    standard_name :

    antenna_is_in_transition_between_sweeps

    comment :

    1 if antenna is in transition, 0 otherwise

    [483 values with dtype=int8]

  • n_samples
    (azimuth)
    int32
    ...

    standard_name :

    number_of_samples_used_to_compute_moments

    meta_group :

    instrument_parameters

    [483 values with dtype=int32]

  • r_calib_index
    (azimuth)
    int8
    ...

    standard_name :

    calibration_data_array_index_per_ray

    meta_group :

    radar_calibration

    comment :

    This is the index for the calibration which applies to this ray

    [483 values with dtype=int8]

  • measured_transmit_power_h
    (azimuth)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_h_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • measured_transmit_power_v
    (azimuth)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_v_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • scan_rate
    (azimuth)
    float32
    ...

    standard_name :

    antenna_angle_scan_rate

    units :

    degrees per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • DBZ
    (azimuth, range)
    float32
    ...

    long_name :

    Computed Horizontal Co-polar Reflectivit

    standard_name :

    equivalent_reflectivity_factor

    units :

    dBZ

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

  • VR
    (azimuth, range)
    float32
    ...

    long_name :

    Computed Velocity

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument

    units :

    m/s

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

Plot Time vs. Azimuth

We need to sort by time and specify the coordinate.

ds.azimuth.plot(y="time")

[<matplotlib.lines.Line2D at 0x7c46421c5810>]

Plot Range vs. Time

We need to sort by time and specify the coordinate.

ds.DBZ.sortby("time").plot(y="time")

<matplotlib.collections.QuadMesh at 0x7c4642225160>

Plot Range vs. Azimuth

ds.DBZ.plot()

<matplotlib.collections.QuadMesh at 0x7c46390bf610>

backend_kwargs

The cfradial1 backend can be parameterized via kwargs. Please observe the possibilities below.

?xd.io.CfRadial1BackendEntrypoint

ds = xr.open_dataset(filename, group="sweep_0", engine="cfradial1", first_dim="time")
display(ds)

<xarray.Dataset> Size: 4MB
Dimensions:                    (time: 483, range: 996)
Coordinates:
  * time                       (time) datetime64[ns] 4kB 2008-06-04T00:15:03 ...
    azimuth                    (time) float32 2kB ...
    elevation                  (time) float32 2kB ...
  * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
    latitude                   float64 8B ...
    longitude                  float64 8B ...
    altitude                   float64 8B ...
Data variables: (12/18)
    sweep_number               int32 4B ...
    sweep_mode                 <U20 80B ...
    prt_mode                   |S32 32B ...
    follow_mode                |S32 32B ...
    sweep_fixed_angle          float32 4B ...
    pulse_width                (time) float32 2kB ...
    ...                         ...
    r_calib_index              (time) int8 483B ...
    measured_transmit_power_h  (time) float32 2kB ...
    measured_transmit_power_v  (time) float32 2kB ...
    scan_rate                  (time) float32 2kB ...
    DBZ                        (time, range) float32 2MB ...
    VR                         (time, range) float32 2MB ...

xarray.Dataset

• Dimensions:
  • time: 483
  • range: 996
• Coordinates: (7)
  • time
    (time)
    datetime64[ns]
    2008-06-04T00:15:03 ... 2008-06-...

    standard_name :

    time

    long_name :

    time in seconds since volume start

    comment :

    times are relative to the volume start_time

    array(['2008-06-04T00:15:03.000000000', '2008-06-04T00:15:03.000000000',
           '2008-06-04T00:15:03.000000000', ..., '2008-06-04T00:15:50.000000000',
           '2008-06-04T00:15:50.000000000', '2008-06-04T00:15:50.000000000'],
          shape=(483,), dtype='datetime64[ns]')

  • azimuth
    (time)
    float32
    ...

    standard_name :

    beam_azimuth_angle

    units :

    degrees

    [483 values with dtype=float32]

  • elevation
    (time)
    float32
    ...

    standard_name :

    beam_elevation_angle

    units :

    degrees

    positive :

    up

    [483 values with dtype=float32]

  • range
    (range)
    float32
    150.0 300.0 ... 1.492e+05 1.494e+05

    standard_name :

    range_to_center_of_measurement_volume

    long_name :

    Range from instrument to center of gate

    units :

    meters

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    150.00000596046448

    meters_between_gates :

    150.00000596046448

    array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,
           149250.     , 149400.     ], shape=(996,), dtype=float32)

  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (18)
  • sweep_number
    ()
    int32
    ...

    standard_name :

    sweep_index_number_0_based

    [1 values with dtype=int32]

  • sweep_mode
    ()
    <U20
    ...

    standard_name :

    scan_mode_for_sweep

    options :

    sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

    [1 values with dtype=<U20]

  • prt_mode
    ()
    |S32
    ...

    standard_name :

    transmit_pulse_mode

    options :

    fixed, staggered, dual

    meta_group :

    radar_parameters

    [1 values with dtype=|S32]

  • follow_mode
    ()
    |S32
    ...

    standard_name :

    follow_mode_for_scan_strategy

    options :

    none, sun, vehicle, aircraft, target, manual

    meta_group :

    instrument_parameters

    [1 values with dtype=|S32]

  • sweep_fixed_angle
    ()
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [1 values with dtype=float32]

  • pulse_width
    (time)
    float32
    ...

    standard_name :

    transmitter_pulse_width

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt
    (time)
    float32
    ...

    standard_name :

    pulse_repetition_frequency

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt_ratio
    (time)
    float32
    ...

    standard_name :

    pulse_repetition_frequency_ratio

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • nyquist_velocity
    (time)
    float32
    ...

    standard_name :

    unambiguous_doppler_velocity

    units :

    meters per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • unambiguous_range
    (time)
    float32
    ...

    standard_name :

    unambiguous_range

    units :

    meters

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • antenna_transition
    (time)
    int8
    ...

    standard_name :

    antenna_is_in_transition_between_sweeps

    comment :

    1 if antenna is in transition, 0 otherwise

    [483 values with dtype=int8]

  • n_samples
    (time)
    int32
    ...

    standard_name :

    number_of_samples_used_to_compute_moments

    meta_group :

    instrument_parameters

    [483 values with dtype=int32]

  • r_calib_index
    (time)
    int8
    ...

    standard_name :

    calibration_data_array_index_per_ray

    meta_group :

    radar_calibration

    comment :

    This is the index for the calibration which applies to this ray

    [483 values with dtype=int8]

  • measured_transmit_power_h
    (time)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_h_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • measured_transmit_power_v
    (time)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_v_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • scan_rate
    (time)
    float32
    ...

    standard_name :

    antenna_angle_scan_rate

    units :

    degrees per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • DBZ
    (time, range)
    float32
    ...

    long_name :

    Computed Horizontal Co-polar Reflectivit

    standard_name :

    equivalent_reflectivity_factor

    units :

    dBZ

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

  • VR
    (time, range)
    float32
    ...

    long_name :

    Computed Velocity

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument

    units :

    m/s

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

ds = xr.open_dataset(
    filename, group="sweep_1", engine="cfradial1", backend_kwargs=dict(first_dim="time")
)
display(ds)

<xarray.Dataset> Size: 4MB
Dimensions:                    (time: 483, range: 996)
Coordinates:
  * time                       (time) datetime64[ns] 4kB 2008-06-04T00:15:50 ...
    azimuth                    (time) float32 2kB ...
    elevation                  (time) float32 2kB ...
  * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
    latitude                   float64 8B ...
    longitude                  float64 8B ...
    altitude                   float64 8B ...
Data variables: (12/18)
    sweep_number               int32 4B ...
    sweep_mode                 <U20 80B ...
    prt_mode                   |S32 32B ...
    follow_mode                |S32 32B ...
    sweep_fixed_angle          float32 4B ...
    pulse_width                (time) float32 2kB ...
    ...                         ...
    r_calib_index              (time) int8 483B ...
    measured_transmit_power_h  (time) float32 2kB ...
    measured_transmit_power_v  (time) float32 2kB ...
    scan_rate                  (time) float32 2kB ...
    DBZ                        (time, range) float32 2MB ...
    VR                         (time, range) float32 2MB ...

xarray.Dataset

• Dimensions:
  • time: 483
  • range: 996
• Coordinates: (7)
  • time
    (time)
    datetime64[ns]
    2008-06-04T00:15:50 ... 2008-06-...

    standard_name :

    time

    long_name :

    time in seconds since volume start

    comment :

    times are relative to the volume start_time

    array(['2008-06-04T00:15:50.000000000', '2008-06-04T00:15:52.000000000',
           '2008-06-04T00:15:53.000000000', ..., '2008-06-04T00:16:39.000000000',
           '2008-06-04T00:16:39.000000000', '2008-06-04T00:16:39.000000000'],
          shape=(483,), dtype='datetime64[ns]')

  • azimuth
    (time)
    float32
    ...

    standard_name :

    beam_azimuth_angle

    units :

    degrees

    [483 values with dtype=float32]

  • elevation
    (time)
    float32
    ...

    standard_name :

    beam_elevation_angle

    units :

    degrees

    positive :

    up

    [483 values with dtype=float32]

  • range
    (range)
    float32
    150.0 300.0 ... 1.492e+05 1.494e+05

    standard_name :

    range_to_center_of_measurement_volume

    long_name :

    Range from instrument to center of gate

    units :

    meters

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    150.00000596046448

    meters_between_gates :

    150.00000596046448

    array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,
           149250.     , 149400.     ], shape=(996,), dtype=float32)

  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (18)
  • sweep_number
    ()
    int32
    ...

    standard_name :

    sweep_index_number_0_based

    [1 values with dtype=int32]

  • sweep_mode
    ()
    <U20
    ...

    standard_name :

    scan_mode_for_sweep

    options :

    sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

    [1 values with dtype=<U20]

  • prt_mode
    ()
    |S32
    ...

    standard_name :

    transmit_pulse_mode

    options :

    fixed, staggered, dual

    meta_group :

    radar_parameters

    [1 values with dtype=|S32]

  • follow_mode
    ()
    |S32
    ...

    standard_name :

    follow_mode_for_scan_strategy

    options :

    none, sun, vehicle, aircraft, target, manual

    meta_group :

    instrument_parameters

    [1 values with dtype=|S32]

  • sweep_fixed_angle
    ()
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [1 values with dtype=float32]

  • pulse_width
    (time)
    float32
    ...

    standard_name :

    transmitter_pulse_width

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt
    (time)
    float32
    ...

    standard_name :

    pulse_repetition_frequency

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • prt_ratio
    (time)
    float32
    ...

    standard_name :

    pulse_repetition_frequency_ratio

    units :

    seconds

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • nyquist_velocity
    (time)
    float32
    ...

    standard_name :

    unambiguous_doppler_velocity

    units :

    meters per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • unambiguous_range
    (time)
    float32
    ...

    standard_name :

    unambiguous_range

    units :

    meters

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • antenna_transition
    (time)
    int8
    ...

    standard_name :

    antenna_is_in_transition_between_sweeps

    comment :

    1 if antenna is in transition, 0 otherwise

    [483 values with dtype=int8]

  • n_samples
    (time)
    int32
    ...

    standard_name :

    number_of_samples_used_to_compute_moments

    meta_group :

    instrument_parameters

    [483 values with dtype=int32]

  • r_calib_index
    (time)
    int8
    ...

    standard_name :

    calibration_data_array_index_per_ray

    meta_group :

    radar_calibration

    comment :

    This is the index for the calibration which applies to this ray

    [483 values with dtype=int8]

  • measured_transmit_power_h
    (time)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_h_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • measured_transmit_power_v
    (time)
    float32
    ...

    standard_name :

    measured_radar_transmit_power_v_channel

    units :

    dBm

    meta_group :

    radar_parameters

    [483 values with dtype=float32]

  • scan_rate
    (time)
    float32
    ...

    standard_name :

    antenna_angle_scan_rate

    units :

    degrees per second

    meta_group :

    instrument_parameters

    [483 values with dtype=float32]

  • DBZ
    (time, range)
    float32
    ...

    long_name :

    Computed Horizontal Co-polar Reflectivit

    standard_name :

    equivalent_reflectivity_factor

    units :

    dBZ

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

  • VR
    (time, range)
    float32
    ...

    long_name :

    Computed Velocity

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument

    units :

    m/s

    threshold_field_name :

    threshold_value :

    -9999.0

    sampling_ratio :

    1.0

    grid_mapping :

    grid_mapping

    [481068 values with dtype=float32]

open_cfradial1_datatree

The same works analoguous with the datatree loader. But additionally we can provide a sweep number or list.

?xd.io.open_cfradial1_datatree

dtree = xd.io.open_cfradial1_datatree(
    filename,
    first_dim="time",
    optional=False,
)
display(dtree)

<xarray.DataTree>
Group: /
│   Dimensions:              (sweep: 9)
│   Coordinates:
│       latitude             float64 8B ...
│       longitude            float64 8B ...
│       altitude             float64 8B ...
│   Dimensions without coordinates: sweep
│   Data variables:
│       volume_number        int32 4B ...
│       time_coverage_start  |S32 32B ...
│       time_coverage_end    |S32 32B ...
│       sweep_group_name     (sweep) <U7 252B 'sweep_0' 'sweep_1' ... 'sweep_8'
│       sweep_fixed_angle    (sweep) float32 36B ...
│   Attributes:
│       Conventions:         CF/Radial instrument_parameters radar_parameters rad...
│       version:             1.2
│       title:               TIMREX
│       institution:         
│       references:          
│       source:              
│       history:             
│       comment:             
│       instrument_name:     SPOLRVP8
│       platform_is_mobile:  false
├── Group: /sweep_0
│       Dimensions:            (time: 483, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:15:03 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_1
│       Dimensions:            (time: 483, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:15:50 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_2
│       Dimensions:            (time: 482, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:16:40 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_3
│       Dimensions:            (time: 483, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:17:27 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_4
│       Dimensions:            (time: 481, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:18:15 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_5
│       Dimensions:            (time: 482, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:19:03 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_6
│       Dimensions:            (time: 482, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:19:51 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
├── Group: /sweep_7
│       Dimensions:            (time: 484, range: 996)
│       Coordinates:
│         * time               (time) datetime64[ns] 4kB 2008-06-04T00:20:39 ... 2008...
│           azimuth            (time) float32 2kB ...
│           elevation          (time) float32 2kB ...
│         * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
│       Data variables:
│           sweep_number       int32 4B ...
│           sweep_mode         <U20 80B 'azimuth_surveillance'
│           prt_mode           |S32 32B ...
│           follow_mode        |S32 32B ...
│           sweep_fixed_angle  float32 4B ...
│           DBZ                (time, range) float32 2MB ...
│           VR                 (time, range) float32 2MB ...
└── Group: /sweep_8
        Dimensions:            (time: 483, range: 996)
        Coordinates:
          * time               (time) datetime64[ns] 4kB 2008-06-04T00:21:28 ... 2008...
            azimuth            (time) float32 2kB ...
            elevation          (time) float32 2kB ...
          * range              (range) float32 4kB 150.0 300.0 ... 1.492e+05 1.494e+05
        Data variables:
            sweep_number       int32 4B ...
            sweep_mode         <U20 80B 'azimuth_surveillance'
            prt_mode           |S32 32B ...
            follow_mode        |S32 32B ...
            sweep_fixed_angle  float32 4B ...
            DBZ                (time, range) float32 2MB ...
            VR                 (time, range) float32 2MB ...

xarray.DataTree

• /sweep_0(11)

  • Dimensions:
    • sweep: 9
    • time: 483
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:15:03 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:15:03.000000000', '2008-06-04T00:15:03.000000000','2008-06-04T00:15:03.000000000', ..., '2008-06-04T00:15:50.000000000','2008-06-04T00:15:50.000000000', '2008-06-04T00:15:50.000000000'],shape=(483,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [483 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_1(11)

  • Dimensions:
    • sweep: 9
    • time: 483
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:15:50 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:15:50.000000000', '2008-06-04T00:15:52.000000000','2008-06-04T00:15:53.000000000', ..., '2008-06-04T00:16:39.000000000','2008-06-04T00:16:39.000000000', '2008-06-04T00:16:39.000000000'],shape=(483,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [483 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_2(11)

  • Dimensions:
    • sweep: 9
    • time: 482
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:16:40 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:16:40.000000000', '2008-06-04T00:16:40.000000000','2008-06-04T00:16:40.000000000', ..., '2008-06-04T00:17:27.000000000','2008-06-04T00:17:27.000000000', '2008-06-04T00:17:27.000000000'],shape=(482,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [482 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [482 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

  /sweep_3(11)

  • Dimensions:
    • sweep: 9
    • time: 483
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:17:27 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:17:27.000000000', '2008-06-04T00:17:28.000000000','2008-06-04T00:17:28.000000000', ..., '2008-06-04T00:18:15.000000000','2008-06-04T00:18:15.000000000', '2008-06-04T00:18:15.000000000'],shape=(483,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [483 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_4(11)

  • Dimensions:
    • sweep: 9
    • time: 481
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:18:15 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:18:15.000000000', '2008-06-04T00:18:16.000000000','2008-06-04T00:18:16.000000000', ..., '2008-06-04T00:19:03.000000000','2008-06-04T00:19:03.000000000', '2008-06-04T00:19:03.000000000'],shape=(481,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [481 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [481 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [479076 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [479076 values with dtype=float32]

  /sweep_5(11)

  • Dimensions:
    • sweep: 9
    • time: 482
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:19:03 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:19:03.000000000', '2008-06-04T00:19:04.000000000','2008-06-04T00:19:04.000000000', ..., '2008-06-04T00:19:51.000000000','2008-06-04T00:19:51.000000000', '2008-06-04T00:19:51.000000000'],shape=(482,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [482 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [482 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

  /sweep_6(11)

  • Dimensions:
    • sweep: 9
    • time: 482
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:19:51 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:19:51.000000000', '2008-06-04T00:19:52.000000000','2008-06-04T00:19:52.000000000', ..., '2008-06-04T00:20:39.000000000','2008-06-04T00:20:39.000000000', '2008-06-04T00:20:39.000000000'],shape=(482,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [482 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [482 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [480072 values with dtype=float32]

  /sweep_7(11)

  • Dimensions:
    • sweep: 9
    • time: 484
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:20:39 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:20:39.000000000', '2008-06-04T00:20:41.000000000','2008-06-04T00:20:41.000000000', ..., '2008-06-04T00:21:28.000000000','2008-06-04T00:21:28.000000000', '2008-06-04T00:21:28.000000000'],shape=(484,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [484 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [484 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [482064 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [482064 values with dtype=float32]

  /sweep_8(11)

  • Dimensions:
    • sweep: 9
    • time: 483
    • range: 996
  • Coordinates: (4)
    • time
      (time)
      datetime64[ns]
      2008-06-04T00:21:28 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:21:28.000000000', '2008-06-04T00:21:30.000000000','2008-06-04T00:21:30.000000000', ..., '2008-06-04T00:22:16.000000000','2008-06-04T00:22:17.000000000', '2008-06-04T00:22:17.000000000'],shape=(483,), dtype='datetime64[ns]')

    • azimuth
      (time)
      float32
      ...

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      [483 values with dtype=float32]

    • elevation
      (time)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (7)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • DBZ
      (time, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (time, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

• Dimensions:
  • sweep: 9
• Coordinates: (3)
  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (5)
  • volume_number
    ()
    int32
    ...

    standard_name :

    data_volume_index_number

    [1 values with dtype=int32]

  • time_coverage_start
    ()
    |S32
    ...

    standard_name :

    data_volume_start_time_utc

    comment :

    ray times are relative to start time in secs

    [1 values with dtype=|S32]

  • time_coverage_end
    ()
    |S32
    ...

    standard_name :

    data_volume_end_time_utc

    [1 values with dtype=|S32]

  • sweep_group_name
    (sweep)
    <U7
    'sweep_0' 'sweep_1' ... 'sweep_8'

    array(['sweep_0', 'sweep_1', 'sweep_2', 'sweep_3', 'sweep_4', 'sweep_5',
           'sweep_6', 'sweep_7', 'sweep_8'], dtype='<U7')

  • sweep_fixed_angle
    (sweep)
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [9 values with dtype=float32]

• Attributes: (10)

  Conventions :

  CF/Radial instrument_parameters radar_parameters radar_calibration geometry_correction

  version :

  1.2

  title :

  TIMREX

  institution :

  references :

  source :

  history :

  comment :

  instrument_name :

  SPOLRVP8

  platform_is_mobile :

  false

Plot Sweep Range vs. Time

dtree["sweep_0"].ds.DBZ.plot()

<matplotlib.collections.QuadMesh at 0x7c46336196d0>

Plot Sweep Range vs. Azimuth

dtree["sweep_0"].ds.DBZ.sortby("azimuth").plot(y="azimuth")

<matplotlib.collections.QuadMesh at 0x7c46336c7250>

dtree = xd.io.open_cfradial1_datatree(filename, sweep=[0, 1, 8])
display(dtree)

<xarray.DataTree>
Group: /
│   Dimensions:              (sweep: 9)
│   Coordinates:
│       latitude             float64 8B ...
│       longitude            float64 8B ...
│       altitude             float64 8B ...
│   Dimensions without coordinates: sweep
│   Data variables:
│       volume_number        int32 4B ...
│       platform_type        |S32 32B ...
│       primary_axis         |S32 32B ...
│       status_str           |S1 1B ...
│       instrument_type      |S32 32B ...
│       time_coverage_start  |S32 32B ...
│       time_coverage_end    |S32 32B ...
│       sweep_group_name     (sweep) <U7 252B 'sweep_0' 'sweep_1' ... 'sweep_8'
│       sweep_fixed_angle    (sweep) float32 36B ...
│   Attributes: (12/13)
│       Conventions:         CF/Radial instrument_parameters radar_parameters rad...
│       version:             1.2
│       title:               TIMREX
│       institution:         
│       references:          
│       source:              
│       ...                  ...
│       comment:             
│       instrument_name:     SPOLRVP8
│       site_name:           
│       scan_name:           
│       scan_id:             0
│       platform_is_mobile:  false
├── Group: /sweep_0
│       Dimensions:                    (azimuth: 483, range: 996)
│       Coordinates:
│         * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
│           elevation                  (azimuth) float32 2kB ...
│           time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:15:...
│         * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
│       Data variables: (12/18)
│           sweep_number               int32 4B ...
│           sweep_mode                 <U20 80B 'azimuth_surveillance'
│           prt_mode                   |S32 32B ...
│           follow_mode                |S32 32B ...
│           sweep_fixed_angle          float32 4B ...
│           pulse_width                (azimuth) float32 2kB ...
│           ...                         ...
│           r_calib_index              (azimuth) int8 483B ...
│           measured_transmit_power_h  (azimuth) float32 2kB ...
│           measured_transmit_power_v  (azimuth) float32 2kB ...
│           scan_rate                  (azimuth) float32 2kB ...
│           DBZ                        (azimuth, range) float32 2MB ...
│           VR                         (azimuth, range) float32 2MB ...
├── Group: /sweep_1
│       Dimensions:                    (azimuth: 483, range: 996)
│       Coordinates:
│         * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
│           elevation                  (azimuth) float32 2kB ...
│           time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:16:...
│         * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
│       Data variables: (12/18)
│           sweep_number               int32 4B ...
│           sweep_mode                 <U20 80B 'azimuth_surveillance'
│           prt_mode                   |S32 32B ...
│           follow_mode                |S32 32B ...
│           sweep_fixed_angle          float32 4B ...
│           pulse_width                (azimuth) float32 2kB ...
│           ...                         ...
│           r_calib_index              (azimuth) int8 483B ...
│           measured_transmit_power_h  (azimuth) float32 2kB ...
│           measured_transmit_power_v  (azimuth) float32 2kB ...
│           scan_rate                  (azimuth) float32 2kB ...
│           DBZ                        (azimuth, range) float32 2MB ...
│           VR                         (azimuth, range) float32 2MB ...
└── Group: /sweep_2
        Dimensions:                    (azimuth: 483, range: 996)
        Coordinates:
          * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
            elevation                  (azimuth) float32 2kB ...
            time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:21:...
          * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
        Data variables: (12/18)
            sweep_number               int32 4B ...
            sweep_mode                 <U20 80B 'azimuth_surveillance'
            prt_mode                   |S32 32B ...
            follow_mode                |S32 32B ...
            sweep_fixed_angle          float32 4B ...
            pulse_width                (azimuth) float32 2kB ...
            ...                         ...
            r_calib_index              (azimuth) int8 483B ...
            measured_transmit_power_h  (azimuth) float32 2kB ...
            measured_transmit_power_v  (azimuth) float32 2kB ...
            scan_rate                  (azimuth) float32 2kB ...
            DBZ                        (azimuth, range) float32 2MB ...
            VR                         (azimuth, range) float32 2MB ...

xarray.DataTree

• /sweep_0(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 483
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(483,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:15:34 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:15:34.000000000', '2008-06-04T00:15:34.000000000','2008-06-04T00:15:34.000000000', ..., '2008-06-04T00:15:33.000000000','2008-06-04T00:15:33.000000000', '2008-06-04T00:15:34.000000000'],shape=(483,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [483 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [483 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [483 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_1(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 483
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(483,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:16:21 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:16:21.000000000', '2008-06-04T00:16:21.000000000','2008-06-04T00:16:21.000000000', ..., '2008-06-04T00:16:20.000000000','2008-06-04T00:16:20.000000000', '2008-06-04T00:16:20.000000000'],shape=(483,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [483 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [483 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [483 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_2(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 483
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(483,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:21:49 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:21:49.000000000', '2008-06-04T00:21:49.000000000','2008-06-04T00:21:49.000000000', ..., '2008-06-04T00:21:49.000000000','2008-06-04T00:21:49.000000000', '2008-06-04T00:21:49.000000000'],shape=(483,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [483 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [483 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [483 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

• Dimensions:
  • sweep: 9
• Coordinates: (3)
  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (9)
  • volume_number
    ()
    int32
    ...

    standard_name :

    data_volume_index_number

    [1 values with dtype=int32]

  • platform_type
    ()
    |S32
    ...

    standard_name :

    platform_type

    options :

    fixed, vehicle, ship, aircraft_fore, aircraft_aft, aircraft_tail, aircraft_belly, aircraft_roof, aircraft_nose, satellite_orbit, satellite_geostat

    [1 values with dtype=|S32]

  • primary_axis
    ()
    |S32
    ...

    standard_name :

    primary_axis_of_rotation

    options :

    axis_z, axis_y, axis_x

    [1 values with dtype=|S32]

  • status_str
    ()
    |S1
    ...

    standard_name :

    status_xml

    [1 values with dtype=|S1]

  • instrument_type
    ()
    |S32
    ...

    standard_name :

    type_of_instrument

    options :

    radar, lidar

    meta_group :

    instrument_parameters

    [1 values with dtype=|S32]

  • time_coverage_start
    ()
    |S32
    ...

    standard_name :

    data_volume_start_time_utc

    comment :

    ray times are relative to start time in secs

    [1 values with dtype=|S32]

  • time_coverage_end
    ()
    |S32
    ...

    standard_name :

    data_volume_end_time_utc

    [1 values with dtype=|S32]

  • sweep_group_name
    (sweep)
    <U7
    'sweep_0' 'sweep_1' ... 'sweep_8'

    array(['sweep_0', 'sweep_1', 'sweep_2', 'sweep_3', 'sweep_4', 'sweep_5',
           'sweep_6', 'sweep_7', 'sweep_8'], dtype='<U7')

  • sweep_fixed_angle
    (sweep)
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [9 values with dtype=float32]

• Attributes: (13)

  Conventions :

  CF/Radial instrument_parameters radar_parameters radar_calibration geometry_correction

  version :

  1.2

  title :

  TIMREX

  institution :

  references :

  source :

  history :

  comment :

  instrument_name :

  SPOLRVP8

  site_name :

  scan_name :

  scan_id :

  0

  platform_is_mobile :

  false

dtree = xd.io.open_cfradial1_datatree(filename, sweep=["sweep_0", "sweep_4", "sweep_8"])
display(dtree)

<xarray.DataTree>
Group: /
│   Dimensions:              (sweep: 9)
│   Coordinates:
│       latitude             float64 8B ...
│       longitude            float64 8B ...
│       altitude             float64 8B ...
│   Dimensions without coordinates: sweep
│   Data variables:
│       volume_number        int32 4B ...
│       platform_type        |S32 32B ...
│       primary_axis         |S32 32B ...
│       status_str           |S1 1B ...
│       instrument_type      |S32 32B ...
│       time_coverage_start  |S32 32B ...
│       time_coverage_end    |S32 32B ...
│       sweep_group_name     (sweep) <U7 252B 'sweep_0' 'sweep_1' ... 'sweep_8'
│       sweep_fixed_angle    (sweep) float32 36B ...
│   Attributes: (12/13)
│       Conventions:         CF/Radial instrument_parameters radar_parameters rad...
│       version:             1.2
│       title:               TIMREX
│       institution:         
│       references:          
│       source:              
│       ...                  ...
│       comment:             
│       instrument_name:     SPOLRVP8
│       site_name:           
│       scan_name:           
│       scan_id:             0
│       platform_is_mobile:  false
├── Group: /sweep_0
│       Dimensions:                    (azimuth: 483, range: 996)
│       Coordinates:
│         * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
│           elevation                  (azimuth) float32 2kB ...
│           time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:15:...
│         * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
│       Data variables: (12/18)
│           sweep_number               int32 4B ...
│           sweep_mode                 <U20 80B 'azimuth_surveillance'
│           prt_mode                   |S32 32B ...
│           follow_mode                |S32 32B ...
│           sweep_fixed_angle          float32 4B ...
│           pulse_width                (azimuth) float32 2kB ...
│           ...                         ...
│           r_calib_index              (azimuth) int8 483B ...
│           measured_transmit_power_h  (azimuth) float32 2kB ...
│           measured_transmit_power_v  (azimuth) float32 2kB ...
│           scan_rate                  (azimuth) float32 2kB ...
│           DBZ                        (azimuth, range) float32 2MB ...
│           VR                         (azimuth, range) float32 2MB ...
├── Group: /sweep_1
│       Dimensions:                    (azimuth: 481, range: 996)
│       Coordinates:
│         * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
│           elevation                  (azimuth) float32 2kB ...
│           time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:18:...
│         * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
│       Data variables: (12/18)
│           sweep_number               int32 4B ...
│           sweep_mode                 <U20 80B 'azimuth_surveillance'
│           prt_mode                   |S32 32B ...
│           follow_mode                |S32 32B ...
│           sweep_fixed_angle          float32 4B ...
│           pulse_width                (azimuth) float32 2kB ...
│           ...                         ...
│           r_calib_index              (azimuth) int8 481B ...
│           measured_transmit_power_h  (azimuth) float32 2kB ...
│           measured_transmit_power_v  (azimuth) float32 2kB ...
│           scan_rate                  (azimuth) float32 2kB ...
│           DBZ                        (azimuth, range) float32 2MB ...
│           VR                         (azimuth, range) float32 2MB ...
└── Group: /sweep_2
        Dimensions:                    (azimuth: 483, range: 996)
        Coordinates:
          * azimuth                    (azimuth) float32 2kB 0.0 0.75 ... 358.5 359.2
            elevation                  (azimuth) float32 2kB ...
            time                       (azimuth) datetime64[ns] 4kB 2008-06-04T00:21:...
          * range                      (range) float32 4kB 150.0 300.0 ... 1.494e+05
        Data variables: (12/18)
            sweep_number               int32 4B ...
            sweep_mode                 <U20 80B 'azimuth_surveillance'
            prt_mode                   |S32 32B ...
            follow_mode                |S32 32B ...
            sweep_fixed_angle          float32 4B ...
            pulse_width                (azimuth) float32 2kB ...
            ...                         ...
            r_calib_index              (azimuth) int8 483B ...
            measured_transmit_power_h  (azimuth) float32 2kB ...
            measured_transmit_power_v  (azimuth) float32 2kB ...
            scan_rate                  (azimuth) float32 2kB ...
            DBZ                        (azimuth, range) float32 2MB ...
            VR                         (azimuth, range) float32 2MB ...

xarray.DataTree

• /sweep_0(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 483
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(483,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:15:34 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:15:34.000000000', '2008-06-04T00:15:34.000000000','2008-06-04T00:15:34.000000000', ..., '2008-06-04T00:15:33.000000000','2008-06-04T00:15:33.000000000', '2008-06-04T00:15:34.000000000'],shape=(483,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [483 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [483 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [483 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

  /sweep_1(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 481
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(481,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [481 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:18:41 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:18:41.000000000', '2008-06-04T00:18:41.000000000','2008-06-04T00:18:41.000000000', ..., '2008-06-04T00:18:41.000000000','2008-06-04T00:18:41.000000000', '2008-06-04T00:18:41.000000000'],shape=(481,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [481 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [481 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [481 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [481 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [481 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [481 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [479076 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [479076 values with dtype=float32]

  /sweep_2(22)

  • Dimensions:
    • sweep: 9
    • azimuth: 483
    • range: 996
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float32
      0.0 0.75 1.5 ... 357.8 358.5 359.2

      standard_name :

      beam_azimuth_angle

      units :

      degrees

      array([  0.  ,   0.75,   1.5 , ..., 357.75, 358.5 , 359.25],shape=(483,), dtype=float32)

    • elevation
      (azimuth)
      float32
      ...

      standard_name :

      beam_elevation_angle

      units :

      degrees

      positive :

      up

      [483 values with dtype=float32]

    • time
      (azimuth)
      datetime64[ns]
      2008-06-04T00:21:49 ... 2008-06-...

      standard_name :

      time

      long_name :

      time in seconds since volume start

      comment :

      times are relative to the volume start_time

      array(['2008-06-04T00:21:49.000000000', '2008-06-04T00:21:49.000000000','2008-06-04T00:21:49.000000000', ..., '2008-06-04T00:21:49.000000000','2008-06-04T00:21:49.000000000', '2008-06-04T00:21:49.000000000'],shape=(483,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      150.0 300.0 ... 1.492e+05 1.494e+05

      standard_name :

      range_to_center_of_measurement_volume

      long_name :

      Range from instrument to center of gate

      units :

      meters

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      150.00000596046448

      meters_between_gates :

      150.00000596046448

      array([   150.     ,    300.     ,    450.00003, ..., 149100.     ,149250.     , 149400.     ], shape=(996,), dtype=float32)

  • Data variables: (18)
    • sweep_number
      ()
      int32
      ...

      standard_name :

      sweep_index_number_0_based

      [1 values with dtype=int32]

    • sweep_mode
      ()
      <U20
      'azimuth_surveillance'

      standard_name :

      scan_mode_for_sweep

      options :

      sector, coplane, rhi, vertical_pointing, idle, azimuth_surveillance, elevation_surveillance, sunscan, pointing, calibration, manual_ppi, manual_rhi

      array('azimuth_surveillance', dtype='<U20')

    • prt_mode
      ()
      |S32
      ...

      standard_name :

      transmit_pulse_mode

      options :

      fixed, staggered, dual

      meta_group :

      radar_parameters

      [1 values with dtype=|S32]

    • follow_mode
      ()
      |S32
      ...

      standard_name :

      follow_mode_for_scan_strategy

      options :

      none, sun, vehicle, aircraft, target, manual

      meta_group :

      instrument_parameters

      [1 values with dtype=|S32]

    • sweep_fixed_angle
      ()
      float32
      ...

      standard_name :

      beam_target_fixed_angle

      units :

      degrees

      [1 values with dtype=float32]

    • pulse_width
      (azimuth)
      float32
      ...

      standard_name :

      transmitter_pulse_width

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • prt_ratio
      (azimuth)
      float32
      ...

      standard_name :

      pulse_repetition_frequency_ratio

      units :

      seconds

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • nyquist_velocity
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_doppler_velocity

      units :

      meters per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • unambiguous_range
      (azimuth)
      float32
      ...

      standard_name :

      unambiguous_range

      units :

      meters

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • antenna_transition
      (azimuth)
      int8
      ...

      standard_name :

      antenna_is_in_transition_between_sweeps

      comment :

      1 if antenna is in transition, 0 otherwise

      [483 values with dtype=int8]

    • n_samples
      (azimuth)
      int32
      ...

      standard_name :

      number_of_samples_used_to_compute_moments

      meta_group :

      instrument_parameters

      [483 values with dtype=int32]

    • r_calib_index
      (azimuth)
      int8
      ...

      standard_name :

      calibration_data_array_index_per_ray

      meta_group :

      radar_calibration

      comment :

      This is the index for the calibration which applies to this ray

      [483 values with dtype=int8]

    • measured_transmit_power_h
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_h_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • measured_transmit_power_v
      (azimuth)
      float32
      ...

      standard_name :

      measured_radar_transmit_power_v_channel

      units :

      dBm

      meta_group :

      radar_parameters

      [483 values with dtype=float32]

    • scan_rate
      (azimuth)
      float32
      ...

      standard_name :

      antenna_angle_scan_rate

      units :

      degrees per second

      meta_group :

      instrument_parameters

      [483 values with dtype=float32]

    • DBZ
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Horizontal Co-polar Reflectivit

      standard_name :

      equivalent_reflectivity_factor

      units :

      dBZ

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

    • VR
      (azimuth, range)
      float32
      ...

      long_name :

      Computed Velocity

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument

      units :

      m/s

      threshold_field_name :

      threshold_value :

      -9999.0

      sampling_ratio :

      1.0

      grid_mapping :

      grid_mapping

      [481068 values with dtype=float32]

• Dimensions:
  • sweep: 9
• Coordinates: (3)
  • latitude
    ()
    float64
    ...

    standard_name :

    latitude

    units :

    degrees_north

    [1 values with dtype=float64]

  • longitude
    ()
    float64
    ...

    standard_name :

    longitude

    units :

    degrees_east

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    standard_name :

    altitude

    units :

    meters

    positive :

    up

    [1 values with dtype=float64]

• Data variables: (9)
  • volume_number
    ()
    int32
    ...

    standard_name :

    data_volume_index_number

    [1 values with dtype=int32]

  • platform_type
    ()
    |S32
    ...

    standard_name :

    platform_type

    options :

    fixed, vehicle, ship, aircraft_fore, aircraft_aft, aircraft_tail, aircraft_belly, aircraft_roof, aircraft_nose, satellite_orbit, satellite_geostat

    [1 values with dtype=|S32]

  • primary_axis
    ()
    |S32
    ...

    standard_name :

    primary_axis_of_rotation

    options :

    axis_z, axis_y, axis_x

    [1 values with dtype=|S32]

  • status_str
    ()
    |S1
    ...

    standard_name :

    status_xml

    [1 values with dtype=|S1]

  • instrument_type
    ()
    |S32
    ...

    standard_name :

    type_of_instrument

    options :

    radar, lidar

    meta_group :

    instrument_parameters

    [1 values with dtype=|S32]

  • time_coverage_start
    ()
    |S32
    ...

    standard_name :

    data_volume_start_time_utc

    comment :

    ray times are relative to start time in secs

    [1 values with dtype=|S32]

  • time_coverage_end
    ()
    |S32
    ...

    standard_name :

    data_volume_end_time_utc

    [1 values with dtype=|S32]

  • sweep_group_name
    (sweep)
    <U7
    'sweep_0' 'sweep_1' ... 'sweep_8'

    array(['sweep_0', 'sweep_1', 'sweep_2', 'sweep_3', 'sweep_4', 'sweep_5',
           'sweep_6', 'sweep_7', 'sweep_8'], dtype='<U7')

  • sweep_fixed_angle
    (sweep)
    float32
    ...

    standard_name :

    beam_target_fixed_angle

    units :

    degrees

    [9 values with dtype=float32]

• Attributes: (13)

  Conventions :

  CF/Radial instrument_parameters radar_parameters radar_calibration geometry_correction

  version :

  1.2

  title :

  TIMREX

  institution :

  references :

  source :

  history :

  comment :

  instrument_name :

  SPOLRVP8

  site_name :

  scan_name :

  scan_id :

  0

  platform_is_mobile :

  false