Validate spectral homogenization results after changing no-data mask computation algorithm within geoarray.
Since https://gitext.gfz-potsdam.de/danschef/geoarray/commit/ff68bcb170e86b25729ee75065e86030d2999d28 (merged into master in https://gitext.gfz-potsdam.de/danschef/geoarray/commit/584ab3efa533194cf82e789c21de760d6be56cf3 (v0.8.2)) pixels that contain the no-data value in not all bands are not treated as 'no-data' anymore. This might affect the spectral homogenization results of gms_preprocessing. Thus, this needs to be validated.
Possible solution: Add an option for enabling a rigorous no-data pixel assignment for these image positions to GeoArray.calc_mask_nodata.