wradlib.clutter.filter_gabella_a#
- wradlib.clutter.filter_gabella_a(img, wsize, tr1, cartesian=False, radial=False)[source]#
First part of the Gabella filter looking for large reflectivity gradients.
This function checks for each pixel in
img
how many pixels surrounding it in a window ofwsize
are bytr1
smaller than the central pixel.- Parameters:
img (
numpy.ndarray
) – radar image to which the filter is to be appliedwsize (
int
) – Size of the window surrounding the central pixeltr1 (
float
) – Threshold valuecartesian (
bool
) – Specify if the input grid is Cartesian or polarradial (
bool
) – Specify if only radial information should be used
- Returns:
output (
numpy.ndarray
) – an array with the same shape asimg
, containing the filter’s results.
See also
Examples