wradlib.georef.satellite.correct_parallax

wradlib.georef.satellite.correct_parallax(sr_xy, nbin, drt, alpha)

Adjust the geo-locations of the SR pixels

With SR, we refer to precipitation radars based on space-born platforms such as TRMM or GPM.

The sr_xy coordinates of the SR beam footprints need to be in the azimuthal equidistant projection of the ground radar. This ensures that the ground radar is fixed at xy-coordinate (0, 0), and every SR bin has its relative xy-coordinates with respect to the ground radar site.

Parameters

  • sr_xy (numpy:numpy.ndarray) – Array of xy-coordinates of shape (nscans, nbeams, 2)

  • nbin (int) – Number of bins along SR beam.

  • drt (float) – Gate lenght of SR in meter.

  • alpha (numpy:numpy.ndarray) – Array of local zenith angles of the SR beams with shape (nscans, nbeams).

Returns

  • sr_xyp (numpy:numpy.ndarray) – Array of parallax corrected coordinates of shape (nscans, nbeams, nbins, 2).

  • r_sr_inv (numpy:numpy.ndarray) – Array of ranges from ground to SR platform of shape (nbins).

  • z_sr (numpy:numpy.ndarray) – Array of SR bin altitudes of shape (nscans, nbeams, nbins).