wradlib.clutter.filter_window_distance¶

wradlib.clutter.filter_window_distance(img, rscale, fsize=1500, tr1=7)¶

2d filter looking for large reflectivity gradients.

This function counts for each bin in img the percentage of surrounding bins in a window of half size fsize which are not tr1 smaller than the central bin. The window is defined using geometrical distance.

Parameters:

img (numpy.ndarray) – 2d polar data to which the filter is to be applied
rscale (float) – range [m] scale of the polar grid
fsize (int) – Half-size [m] of the square window surrounding the central pixel
tr1 (float) – Threshold value

Returns:

output (numpy.ndarray) – an array with the same shape as img, containing the filter’s results.