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?

  • Are DEMs orthoregistered? – aldo_tapia Oct 7 '17 at 17:50
  • All the DEMs were generated in Leica Photogrammetry Suite using same set of GCPs taken from a single orthorectified image as reference. Also, I have generated respective orthorectified images from all the multidate DEMs. Those are coming perfectly coregistered. – user95904 Oct 8 '17 at 2:18
  • If you are looking at changes in sediment within rivers, suggest you have a look at this work first. – Hornbydd Oct 9 '17 at 9:09

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.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.