xradar.georeference.projection.get_earth_radius

xradar.georeference.projection.get_earth_radius(crs, latitude)

Return earth radius (in m) for a given Spheroid model (crs) at a given latitude.

\[R^2 = \frac{a^4 \cos(f)^2 + b^4 \sin(f)^2} {a^2 \cos(f)^2 + b^2 \sin(f)^2}\]

Parameters:

• crs (CoordinateSystem) – spatial reference object

• latitude (float) – geodetic latitude in degrees

Returns:

radius (float) – earth radius in meter