I have 17 rasters, some of which overlap one another. I wish to combine them such that where the rasters overlap the sum of their values is taken. I have tried combining them using raster calculator, simply using
raster1 + raster2 + ...
However this results in the error
"ERROR 010422: Error in porcessing the environment mask."
All my data are in rasters and such should already have a mask enivronment as I understand it, with "NoData" being output where present.
What is the error in my approach?