Function to sum rasters of species layers
sumRastersBySpecies(speciesLayers, layersToSum, filenameToSave, newLayerName)
speciesLayers | stack of species layers rasters |
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layersToSum | names/indices of layers to be summed - optional |
filenameToSave | file path to save output raster |
newLayerName | name of the output raster layer |