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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
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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.

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