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I am a geophysicist working for a small shallow surface geophysics firm. We create 2D slices of the ground showing data collected from various surveys. These are generally cross sections (TIFFs) of uneven shapes.

This is what i want to do using QGIS/GRASS:

enter image description here.

Is there a way to use GRASS GIS/QGIS to georeference these TIFFs in 3D space, vertically? If so is there a guide anywhere?

Would I have to use QGIS as part of workflow using another program (like sketchup)?

(the image is created in Discover, which I want to move away as we start to intergrate into QGIS.)

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  • I too have this problem as a mineral exploration geochemist! First you could convert the individual pixel values to xyz(value) csv file & use PostGIS or GRASS affine transform to move them to the correct location. Then just symbolize them as cubes. Then it will "look" like a raster. Or second in grass create a null-value voxel and then code the voxel cells to the value from the points! Or interpolate the points to a voxel model. Good luck!
    – Phillip Allen
    Mar 1, 2018 at 22:46
  • Hi Phillip, I finally found myself back on this problem after many years being too busy to try! I still would love to find a QGIS solution. I did as you suggested... and have got further but can you help with my current query... gis.stackexchange.com/questions/417216/…
    – Toby Child
    Nov 25, 2021 at 11:47

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