I have two raster DEMs in tif format. They both have the same cell size and spatial reference. I want to subtract the elevation from the 2nd picture from that of the same area in the 1st picture. When i try and minus one raster from the other to obtain elevation difference between them, i get the error code 999999. This is generic and doesn't help me with what i am doing wrong. I have also tried raster calculator but this brings up error code 000539. I thought the issue was that the 1st picture wasnt clipped to the size of the 2nd but when i clip it, it for some reason does not follow the outlibne of the raster in the 2nd picture. I am sure there is a simple solution but one that I cannot put my finger on.