Furuno

import xarray as xr
from open_radar_data import DATASETS

import xradar as xd

Download

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

filename_scnx = DATASETS.fetch("2006_20220324_000000_000.scnx.gz")
filename_scn = DATASETS.fetch("0080_20210730_160000_01_02.scn.gz")

Downloading file '2006_20220324_000000_000.scnx.gz' from 'https://github.com/openradar/open-radar-data/raw/main/data/2006_20220324_000000_000.scnx.gz' to '/home/docs/.cache/open-radar-data'.

Downloading file '0080_20210730_160000_01_02.scn.gz' from 'https://github.com/openradar/open-radar-data/raw/main/data/0080_20210730_160000_01_02.scn.gz' to '/home/docs/.cache/open-radar-data'.

xr.open_dataset

Making use of the xarray furuno backend.

scn format

ds = xr.open_dataset(filename_scn, engine="furuno")
display(ds)

<xarray.Dataset> Size: 55MB
Dimensions:            (azimuth: 1376, range: 602)
Coordinates:
  * azimuth            (azimuth) float64 11kB 0.21 0.47 0.74 ... 359.7 359.9
    elevation          (azimuth) float64 11kB ...
    time               (azimuth) datetime64[ns] 11kB ...
  * range              (range) float32 2kB 25.0 75.0 ... 3.002e+04 3.008e+04
    longitude          float64 8B ...
    latitude           float64 8B ...
    altitude           float64 8B ...
Data variables: (12/14)
    RATE               (azimuth, range) float64 7MB ...
    DBZH               (azimuth, range) float64 7MB ...
    VRADH              (azimuth, range) float64 7MB ...
    ZDR                (azimuth, range) float64 7MB ...
    KDP                (azimuth, range) float64 7MB ...
    PHIDP              (azimuth, range) float64 7MB ...
    ...                 ...
    QUAL               (azimuth, range) uint16 2MB ...
    sweep_mode         <U20 80B ...
    sweep_number       int64 8B ...
    prt_mode           <U7 28B ...
    follow_mode        <U7 28B ...
    sweep_fixed_angle  float64 8B ...
Attributes:
    source:            Furuno
    version:           3
    radar_constant_h:  9.575470000000001e-17
    radar_constant_v:  9.144499999999999e-17

xarray.Dataset

• Dimensions:
  • azimuth: 1376
  • range: 602
• Coordinates: (7)
  • azimuth
    (azimuth)
    float64
    0.21 0.47 0.74 ... 359.7 359.9

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([2.1000e-01, 4.7000e-01, 7.4000e-01, ..., 3.5942e+02, 3.5968e+02,
           3.5994e+02], shape=(1376,))

  • elevation
    (azimuth)
    float64
    ...

    standard_name :

    ray_elevation_angle

    long_name :

    elevation_angle_from_horizontal_plane

    units :

    degrees

    axis :

    radial_elevation_coordinate

    [1376 values with dtype=float64]

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

    standard_name :

    time

    [1376 values with dtype=datetime64[ns]]

  • range
    (range)
    float32
    25.0 75.0 ... 3.002e+04 3.008e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    50.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    25.0

    array([2.5000e+01, 7.5000e+01, 1.2500e+02, ..., 2.9975e+04, 3.0025e+04,
           3.0075e+04], shape=(602,), dtype=float32)

  • longitude
    ()
    float64
    ...

    long_name :

    longitude

    units :

    degrees_east

    standard_name :

    longitude

    [1 values with dtype=float64]

  • latitude
    ()
    float64
    ...

    long_name :

    latitude

    units :

    degrees_north

    positive :

    up

    standard_name :

    latitude

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    long_name :

    altitude

    units :

    meters

    standard_name :

    altitude

    [1 values with dtype=float64]

• Data variables: (14)
  • RATE
    (azimuth, range)
    float64
    ...

    units :

    mm h-1

    long_name :

    rainfall_rate

    standard_name :

    rainfall_rate

    [828352 values with dtype=float64]

  • DBZH
    (azimuth, range)
    float64
    ...

    units :

    dBZ

    long_name :

    Equivalent reflectivity factor H

    standard_name :

    radar_equivalent_reflectivity_factor_h

    [828352 values with dtype=float64]

  • VRADH
    (azimuth, range)
    float64
    ...

    units :

    meters per seconds

    long_name :

    Radial velocity of scatterers away from instrument H

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument_h

    [828352 values with dtype=float64]

  • ZDR
    (azimuth, range)
    float64
    ...

    units :

    dB

    long_name :

    Log differential reflectivity H/V

    standard_name :

    radar_differential_reflectivity_hv

    [828352 values with dtype=float64]

  • KDP
    (azimuth, range)
    float64
    ...

    units :

    degrees per kilometer

    long_name :

    Specific differential phase HV

    standard_name :

    radar_specific_differential_phase_hv

    [828352 values with dtype=float64]

  • PHIDP
    (azimuth, range)
    float64
    ...

    units :

    degrees

    long_name :

    Differential phase HV

    standard_name :

    radar_differential_phase_hv

    [828352 values with dtype=float64]

  • RHOHV
    (azimuth, range)
    float64
    ...

    units :

    unitless

    long_name :

    Correlation coefficient HV

    standard_name :

    radar_correlation_coefficient_hv

    [828352 values with dtype=float64]

  • WRADH
    (azimuth, range)
    float64
    ...

    units :

    meters per seconds

    long_name :

    Doppler spectrum width H

    standard_name :

    radar_doppler_spectrum_width_h

    [828352 values with dtype=float64]

  • QUAL
    (azimuth, range)
    uint16
    ...

    [828352 values with dtype=uint16]

  • sweep_mode
    ()
    <U20
    ...

    [1 values with dtype=<U20]

  • sweep_number
    ()
    int64
    ...

    [1 values with dtype=int64]

  • prt_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • follow_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • sweep_fixed_angle
    ()
    float64
    ...

    [1 values with dtype=float64]

• Attributes: (4)

  source :

  Furuno

  version :

  3

  radar_constant_h :

  9.575470000000001e-17

  radar_constant_v :

  9.144499999999999e-17

Plot Time vs. Azimuth

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

[<matplotlib.lines.Line2D at 0x72c83ef59d10>]

Plot Range vs. Time

We need to sort by time and specify the y-coordinate.

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

<matplotlib.collections.QuadMesh at 0x72c83ee05d30>

Plot Range vs. Azimuth

ds.DBZH.sortby("azimuth").plot(y="azimuth")

<matplotlib.collections.QuadMesh at 0x72c836b3c7d0>

scnx format

ds = xr.open_dataset(filename_scnx, engine="furuno")
display(ds)

<xarray.Dataset> Size: 45MB
Dimensions:            (azimuth: 722, range: 936)
Coordinates:
  * azimuth            (azimuth) float64 6kB 0.19 0.68 1.16 ... 359.2 359.7
    elevation          (azimuth) float64 6kB ...
    time               (azimuth) datetime64[ns] 6kB ...
  * range              (range) float32 4kB 37.5 112.5 ... 7.009e+04 7.016e+04
    longitude          float64 8B ...
    latitude           float64 8B ...
    altitude           float64 8B ...
Data variables: (12/14)
    RATE               (azimuth, range) float64 5MB ...
    DBZH               (azimuth, range) float64 5MB ...
    VRADH              (azimuth, range) float64 5MB ...
    ZDR                (azimuth, range) float64 5MB ...
    KDP                (azimuth, range) float64 5MB ...
    PHIDP              (azimuth, range) float64 5MB ...
    ...                 ...
    QUAL               (azimuth, range) uint16 1MB ...
    sweep_mode         <U20 80B ...
    sweep_number       int64 8B ...
    prt_mode           <U7 28B ...
    follow_mode        <U7 28B ...
    sweep_fixed_angle  float64 8B ...
Attributes:
    source:                     Furuno
    version:                    10
    antenna_gain_h:             337
    antenna_gain_v:             338
    tx_power_h:                 724
    tx_power_v:                 708
    radar_constant_h:           -1294
    radar_constant_v:           -1296
    noise_power_short_pulse_h:  -604

xarray.Dataset

• Dimensions:
  • azimuth: 722
  • range: 936
• Coordinates: (7)
  • azimuth
    (azimuth)
    float64
    0.19 0.68 1.16 ... 359.2 359.7

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([1.9000e-01, 6.8000e-01, 1.1600e+00, ..., 3.5866e+02, 3.5918e+02,
           3.5967e+02], shape=(722,))

  • elevation
    (azimuth)
    float64
    ...

    standard_name :

    ray_elevation_angle

    long_name :

    elevation_angle_from_horizontal_plane

    units :

    degrees

    axis :

    radial_elevation_coordinate

    [722 values with dtype=float64]

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

    standard_name :

    time

    [722 values with dtype=datetime64[ns]]

  • range
    (range)
    float32
    37.5 112.5 ... 7.009e+04 7.016e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    75.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    37.5

    array([3.75000e+01, 1.12500e+02, 1.87500e+02, ..., 7.00125e+04, 7.00875e+04,
           7.01625e+04], shape=(936,), dtype=float32)

  • longitude
    ()
    float64
    ...

    long_name :

    longitude

    units :

    degrees_east

    standard_name :

    longitude

    [1 values with dtype=float64]

  • latitude
    ()
    float64
    ...

    long_name :

    latitude

    units :

    degrees_north

    positive :

    up

    standard_name :

    latitude

    [1 values with dtype=float64]

  • altitude
    ()
    float64
    ...

    long_name :

    altitude

    units :

    meters

    standard_name :

    altitude

    [1 values with dtype=float64]

• Data variables: (14)
  • RATE
    (azimuth, range)
    float64
    ...

    units :

    mm h-1

    long_name :

    rainfall_rate

    standard_name :

    rainfall_rate

    [675792 values with dtype=float64]

  • DBZH
    (azimuth, range)
    float64
    ...

    units :

    dBZ

    long_name :

    Equivalent reflectivity factor H

    standard_name :

    radar_equivalent_reflectivity_factor_h

    [675792 values with dtype=float64]

  • VRADH
    (azimuth, range)
    float64
    ...

    units :

    meters per seconds

    long_name :

    Radial velocity of scatterers away from instrument H

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument_h

    [675792 values with dtype=float64]

  • ZDR
    (azimuth, range)
    float64
    ...

    units :

    dB

    long_name :

    Log differential reflectivity H/V

    standard_name :

    radar_differential_reflectivity_hv

    [675792 values with dtype=float64]

  • KDP
    (azimuth, range)
    float64
    ...

    units :

    degrees per kilometer

    long_name :

    Specific differential phase HV

    standard_name :

    radar_specific_differential_phase_hv

    [675792 values with dtype=float64]

  • PHIDP
    (azimuth, range)
    float64
    ...

    units :

    degrees

    long_name :

    Differential phase HV

    standard_name :

    radar_differential_phase_hv

    [675792 values with dtype=float64]

  • RHOHV
    (azimuth, range)
    float64
    ...

    units :

    unitless

    long_name :

    Correlation coefficient HV

    standard_name :

    radar_correlation_coefficient_hv

    [675792 values with dtype=float64]

  • WRADH
    (azimuth, range)
    float64
    ...

    units :

    meters per seconds

    long_name :

    Doppler spectrum width H

    standard_name :

    radar_doppler_spectrum_width_h

    [675792 values with dtype=float64]

  • QUAL
    (azimuth, range)
    uint16
    ...

    [675792 values with dtype=uint16]

  • sweep_mode
    ()
    <U20
    ...

    [1 values with dtype=<U20]

  • sweep_number
    ()
    int64
    ...

    [1 values with dtype=int64]

  • prt_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • follow_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • sweep_fixed_angle
    ()
    float64
    ...

    [1 values with dtype=float64]

• Attributes: (9)

  source :

  Furuno

  version :

  10

  antenna_gain_h :

  337

  antenna_gain_v :

  338

  tx_power_h :

  724

  tx_power_v :

  708

  radar_constant_h :

  -1294

  radar_constant_v :

  -1296

  noise_power_short_pulse_h :

  -604

Plot Time vs. Azimuth

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

[<matplotlib.lines.Line2D at 0x72c835a1a850>]

Plot Range vs. Time

We need to sort by time and specify the y-coordinate.

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

<matplotlib.collections.QuadMesh at 0x72c835a98e10>

Plot Range vs. Azimuth

ds.DBZH.sortby("azimuth").plot(y="azimuth")

<matplotlib.collections.QuadMesh at 0x72c84155a0d0>

open_furuno_datatree

Furuno scn/scnx files consist only of one sweep. But we might load and combine several sweeps into one DataTree.

dtree = xd.io.open_furuno_datatree(filename_scn)
display(dtree)

<xarray.DataTree>
Group: /
│   Dimensions:              (sweep: 1)
│   Coordinates:
│       longitude            float64 8B 15.45
│       altitude             float64 8B 407.9
│       latitude             float64 8B 47.08
│   Dimensions without coordinates: sweep
│   Data variables:
│       volume_number        int64 8B 0
│       platform_type        <U5 20B 'fixed'
│       instrument_type      <U5 20B 'radar'
│       time_coverage_start  <U20 80B '2021-07-30T16:00:00Z'
│       time_coverage_end    <U20 80B '2021-07-30T16:00:14Z'
│       sweep_group_name     (sweep) int64 8B 0
│       sweep_fixed_angle    (sweep) float64 8B 7.8
│   Attributes:
│       Conventions:      None
│       instrument_name:  None
│       version:          3
│       title:            None
│       institution:      None
│       references:       None
│       source:           Furuno
│       history:          None
│       comment:          im/exported using xradar
└── Group: /sweep_0
        Dimensions:            (azimuth: 1376, range: 602)
        Coordinates:
          * azimuth            (azimuth) float64 11kB 0.21 0.47 0.74 ... 359.7 359.9
            elevation          (azimuth) float64 11kB ...
            time               (azimuth) datetime64[ns] 11kB 2021-07-30T16:00:06.2777...
          * range              (range) float32 2kB 25.0 75.0 ... 3.002e+04 3.008e+04
        Data variables: (12/14)
            RATE               (azimuth, range) float64 7MB ...
            DBZH               (azimuth, range) float64 7MB ...
            VRADH              (azimuth, range) float64 7MB ...
            ZDR                (azimuth, range) float64 7MB ...
            KDP                (azimuth, range) float64 7MB ...
            PHIDP              (azimuth, range) float64 7MB ...
            ...                 ...
            QUAL               (azimuth, range) uint16 2MB ...
            sweep_mode         <U20 80B ...
            sweep_number       int64 8B ...
            prt_mode           <U7 28B ...
            follow_mode        <U7 28B ...
            sweep_fixed_angle  float64 8B ...

xarray.DataTree

• /sweep_0(18)

  • Dimensions:
    • sweep: 1
    • azimuth: 1376
    • range: 602
  • Coordinates: (4)
    • azimuth
      (azimuth)
      float64
      0.21 0.47 0.74 ... 359.7 359.9

      standard_name :

      ray_azimuth_angle

      long_name :

      azimuth_angle_from_true_north

      units :

      degrees

      axis :

      radial_azimuth_coordinate

      array([2.1000e-01, 4.7000e-01, 7.4000e-01, ..., 3.5942e+02, 3.5968e+02,3.5994e+02], shape=(1376,))

    • elevation
      (azimuth)
      float64
      ...

      standard_name :

      ray_elevation_angle

      long_name :

      elevation_angle_from_horizontal_plane

      units :

      degrees

      axis :

      radial_elevation_coordinate

      [1376 values with dtype=float64]

    • time
      (azimuth)
      datetime64[ns]
      2021-07-30T16:00:06.277723500 .....

      standard_name :

      time

      array(['2021-07-30T16:00:06.277723500', '2021-07-30T16:00:06.288556500','2021-07-30T16:00:06.299389500', ..., '2021-07-30T16:00:06.245224500','2021-07-30T16:00:06.256057500', '2021-07-30T16:00:06.266890500'],shape=(1376,), dtype='datetime64[ns]')

    • range
      (range)
      float32
      25.0 75.0 ... 3.002e+04 3.008e+04

      units :

      meters

      standard_name :

      projection_range_coordinate

      long_name :

      range_to_measurement_volume

      axis :

      radial_range_coordinate

      meters_between_gates :

      50.0

      spacing_is_constant :

      true

      meters_to_center_of_first_gate :

      25.0

      array([2.5000e+01, 7.5000e+01, 1.2500e+02, ..., 2.9975e+04, 3.0025e+04,3.0075e+04], shape=(602,), dtype=float32)

  • Data variables: (14)
    • RATE
      (azimuth, range)
      float64
      ...

      units :

      mm h-1

      long_name :

      rainfall_rate

      standard_name :

      rainfall_rate

      [828352 values with dtype=float64]

    • DBZH
      (azimuth, range)
      float64
      ...

      units :

      dBZ

      long_name :

      Equivalent reflectivity factor H

      standard_name :

      radar_equivalent_reflectivity_factor_h

      [828352 values with dtype=float64]

    • VRADH
      (azimuth, range)
      float64
      ...

      units :

      meters per seconds

      long_name :

      Radial velocity of scatterers away from instrument H

      standard_name :

      radial_velocity_of_scatterers_away_from_instrument_h

      [828352 values with dtype=float64]

    • ZDR
      (azimuth, range)
      float64
      ...

      units :

      dB

      long_name :

      Log differential reflectivity H/V

      standard_name :

      radar_differential_reflectivity_hv

      [828352 values with dtype=float64]

    • KDP
      (azimuth, range)
      float64
      ...

      units :

      degrees per kilometer

      long_name :

      Specific differential phase HV

      standard_name :

      radar_specific_differential_phase_hv

      [828352 values with dtype=float64]

    • PHIDP
      (azimuth, range)
      float64
      ...

      units :

      degrees

      long_name :

      Differential phase HV

      standard_name :

      radar_differential_phase_hv

      [828352 values with dtype=float64]

    • RHOHV
      (azimuth, range)
      float64
      ...

      units :

      unitless

      long_name :

      Correlation coefficient HV

      standard_name :

      radar_correlation_coefficient_hv

      [828352 values with dtype=float64]

    • WRADH
      (azimuth, range)
      float64
      ...

      units :

      meters per seconds

      long_name :

      Doppler spectrum width H

      standard_name :

      radar_doppler_spectrum_width_h

      [828352 values with dtype=float64]

    • QUAL
      (azimuth, range)
      uint16
      ...

      [828352 values with dtype=uint16]

    • sweep_mode
      ()
      <U20
      ...

      [1 values with dtype=<U20]

    • sweep_number
      ()
      int64
      ...

      [1 values with dtype=int64]

    • prt_mode
      ()
      <U7
      ...

      [1 values with dtype=<U7]

    • follow_mode
      ()
      <U7
      ...

      [1 values with dtype=<U7]

    • sweep_fixed_angle
      ()
      float64
      ...

      [1 values with dtype=float64]

• Dimensions:
  • sweep: 1
• Coordinates: (3)
  • longitude
    ()
    float64
    15.45

    long_name :

    longitude

    units :

    degrees_east

    standard_name :

    longitude

    array(15.44729)

  • altitude
    ()
    float64
    407.9

    long_name :

    altitude

    units :

    meters

    standard_name :

    altitude

    array(407.9)

  • latitude
    ()
    float64
    47.08

    long_name :

    latitude

    units :

    degrees_north

    positive :

    up

    standard_name :

    latitude

    array(47.07734)

• Data variables: (7)
  • volume_number
    ()
    int64
    0

    array(0)

  • platform_type
    ()
    <U5
    'fixed'

    array('fixed', dtype='<U5')

  • instrument_type
    ()
    <U5
    'radar'

    array('radar', dtype='<U5')

  • time_coverage_start
    ()
    <U20
    '2021-07-30T16:00:00Z'

    array('2021-07-30T16:00:00Z', dtype='<U20')

  • time_coverage_end
    ()
    <U20
    '2021-07-30T16:00:14Z'

    array('2021-07-30T16:00:14Z', dtype='<U20')

  • sweep_group_name
    (sweep)
    int64
    0

    array([0])

  • sweep_fixed_angle
    (sweep)
    float64
    7.8

    array([7.8])

• Attributes: (9)

  Conventions :

  None

  instrument_name :

  None

  version :

  3

  title :

  None

  institution :

  None

  references :

  None

  source :

  Furuno

  history :

  None

  comment :

  im/exported using xradar

Plot Sweep Range vs. Time

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

<matplotlib.collections.QuadMesh at 0x72c8414516d0>

Plot Sweep Range vs. Azimuth

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

<matplotlib.collections.QuadMesh at 0x72c841316fd0>