I have a question about constructing 3D models using the latest TMC data. I've tried using QGIS (and also Blender) to generate them using the DTM-OTH pairs available, and it seems that the only way a sensible looking model can be geneated is by reducing the Z axuis exaggeration by something like 0.00025. I'm using the QGIS2threejs plugin, and that multiplication value is pure guesswork based on "what looks right".
Does anyone have an explanation as to why the original geotiffs have such a huge vertical displacement, or a way of working out what the exact value should be? Attached are images showig the original and adjusted values for a pass covering the Descartes region.
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