earthkit.geo.rotate.unrotate

earthkit.geo.rotate.unrotate(lat, lon, south_pole_lat, south_pole_lon)

Unrotate geographical coordinates on a sphere.

Parameters:

  • lat (ndarray) – Latitudes of the rotated points (degrees).

  • lon (ndarray) – Longitudes of the rotated points (degrees).

  • south_pole_lat (float) – Latitude of the rotated south pole (degrees).

  • south_pole_lon (float) – Longitude of the rotated south pole (degrees).

Returns:

  • ndarray – Unrotated latitudes (degrees).

  • ndarray – Unrotated longitudes (degrees).

unrotate() operates on points already rotated with a rotation specified by (south_pole_lat, south_pole_lon). The function rotates the points back to the original locations.

See also

rotate

Examples

>>> from earthkit.geo.rotate import unrotate
>>> lat = [-18]
>>> lon = [-41]
>>> south_pole_lat = -20
>>> south_pole_lon = -40
>>> unrotate(lat, lon, south_pole_lat, south_pole_lon)
(array([-87.78778846]), array([-25.4673765]))