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mask nan in single band raster #63

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12rambau wants to merge 1 commit into xarray-contrib:main from 12rambau:single_band_mask

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12rambau commented Apr 21, 2022 •

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Fix #62

I computed the alpha channel as it is done for rgb images.
My assomption is that single band dataset will always use np.nan as a nodata value.

At first I wanted to use:

alpha = np.where(das[0]==self._da.rio.nodata, 0, 1)

but if nodata is np.nan it always returns 1. If you know a trick that could work for any value + np.nan that would be great. if not, the assumption I made seems to be commonly accepted. e.g @giswqs use the same in the add_raster method of geemap: https://github.com/giswqs/geemap/blob/13c83f59ebc6790b531277c5908859d4cb5ec190/geemap/geemap.py#L3526


          mask nan in single band raster

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