I have 10 multidate Cartosat-1 stereo pair derived raster DEMs of dates ranging over a decade over a river sand area. I want to derive volumes of sand deposited in that period within that area. Is it possible?
Assuming your DEM is a raster, it's easy to derive its volume as
DEM_vol = sum(DEM * cell_size * cell_size)
The DEM_vol is meaningless but if you take the difference between successive years then you will get the volume difference you are looking for. Just make sure your cell_size and elevation are in meters, in which case your result will be in cubic meters.