wradlib.georef.projection.get_earth_radius

wradlib.georef.projection.get_earth_radius(latitude, *, crs=None)

wradlib.georef.projection.get_earth_radius(obj: DataArray, *, crs=None)

wradlib.georef.projection.get_earth_radius(obj: Dataset, *, crs=None)

Get the radius of the Earth (in m) for a given Spheroid model (crs) at a given position.

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

Parameters:

latitude (float) – geodetic latitude in degrees

Keyword Arguments:

crs –

Coordinate Reference System (CRS) of the coordinates. Must be provided and can be one of:

• A pyproj.crs.CoordinateSystem instance

• A cartopy.crs.CRS instance

• A osgeo.osr.SpatialReference instance

• A type accepted by pyproj.crs.CRS.from_user_input (e.g., EPSG code, PROJ string, dictionary, WKT, or any object with a to_wkt() method)

Defaults to EPSG(4326).

Returns:

radius (float) – earth radius in meter