cordex.derotate_vector

cordex.derotate_vector#

derotate_vector(u, v, lon=None, lat=None, pollon=None, pollat=None)[source]#

Derotate vector components from rotated coordinates.

The function performs a backward transformation of, e.g., velocity components u and v from a rotated spherical coordinate system to a geographical system. If only the components u and v are provided, it is assumed, they are DataArrays containing a rotated latitude longitude grid mapping and lon lat coordinates that are used for the transformation.

Parameters:

  • u (float or DataArray) – u component of vector in rotated coordinate system.

  • v (float or DataArray) – v component of vector in rotated coordinate system.

  • lon (float or DataArray) – Longitude coordinates in which to transform the vector components.

  • lat (float or DataArray) – Latitude coordinates in which to transform the vector components.

  • pollon (float) – Longitude of north pole in geographical coordinate system.

  • pollat (float) – Latitude of north pole in geographical coordinate system.

Returns:

  • ut (DataArray) – Transformed u vector component.

  • vt (DataArray) – Transformed v vector component.