Change algorithm for summarizing values in the portion of a raster dataset that is covered by a polygon (rasterio -> exactextract)#175
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CyrilThebault wants to merge 1 commit intoCH-Earth:mainfrom
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…taset that is covered by a polygon (rasterio -> exactextract)
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Until now, rasterio was used to count the number of pixel in each sub-catchments with the function zonal_stats. This algorithm can handle that in 2 different way: either by including all pixels that touch the sub-catchment, or include only those whose centroids fall within the sub-catchment. Both of these methods can be problematic for very small sub-catchments because zonal_stats doesn't handle fraction of pixels. To overcome this limitation I suggest using the package exactextract (https://isciences.github.io/exactextract/) which is a library for extracting and summarizing the values in the portion of a raster dataset that is covered by a polygon (and handle fraction of pixels).