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I am modeling glacier retreat scatching polygons on DEM surface trying to come out with 3D scatch.

Is it possible to adjust "height" of polygon to follow elevation of DEM surface (eg. glacier height is 70 meters and it will be the same all across the terrain) ?

So far It looks like this, not following terrain

enter image description here

  • You can add surface information resources.arcgis.com/en/help/main/10.2/index.html#//… if you have a 3d analyst license but this will only affect the vertices, in the area between vertices (across the top) it will be rendered as flat. If you want the terrain height +70m then take the surface (within a buffer of 100 approx metres of the glacier for speed) and add 70m to it with the plus tool (spatial analyst license needed) resources.arcgis.com/en/help/main/10.2/index.html#//… and use this as the surface for elevations. – Michael Stimson Apr 29 '18 at 22:04
  • I don't think they want to know how to do it in ArcGIS as they have tagged QGIS. – AWGIS Jun 4 '18 at 14:38
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I have once used similar feature in the Google Earth, such as here: Google Earth Polygon surface area to follow the curvature of the earth model

The QGIS 3 and above have added support for the 3D view. I think this is what you can try (see video: Exploring the 3D Viewer in QGIS 3.0). If you also want to show the thickness of your glacier, you might be able to use the 2.5D (see figure).

enter image description here

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