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I've done quite a bit of research here and elsewhere and am still having trouble coming up with a solution for measuring volumes using a DEM derived from high-resolution (1 m) stereo satellite imagery.

The closest solution I have found so far has been this: "How to calculate the volume of several DEMs to obtain elevation and volume changes?".

I understand that the 3D analyst extension within ArcGIS would be able to accomplish this, however, I am limited to the availability of open source software such as QGIS which I am an active user of.

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    A first approximation is just the sum of the DEM values multiplied by the area of a DEM pixel, when you use the same units for each. That should be doable in the QGIS expression calculator... – Spacedman May 5 '16 at 21:52
  • look at How much rock was erupted from Mt St Helens? in Python only – gene May 6 '16 at 8:27
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QGIS can use the GRASS GIS and SAGA GIS tools that solve the problem (example uses GRID VOLUME by SAGA GIS from processing). enter image description here

  • pigreco, i can't find those tools in the SAGA – newGIS Aug 7 '17 at 7:08
  • Raster volume searches - they probably changed the name – pigreco Aug 8 '17 at 7:54

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