Hi Steve,
Yes, all of the rasters have the same spatial reference, 1km cell size, and origin as they were retrieved from the same dataset. Sorry, I should have mentioned that some cells from the input rasters do contain missing data, so might this issue be compounded after the computations?
Cell Statistics was well-suited for this computation, but I am still curious as to why there is data loss with Map Algebra.
Thank you!
Brent