It is a simple cutting tool (in slices) of DEM data, to draw pretty postcards, for lovers of reliefs.
The principle is to build a series of altitude profiles (lines or polygons), to juxtapose them to give the illusion of a 3D view. Here, no calculation of the atmospheric refractive index, no consideration of the Earth’s curvature … just a little geometry, and the styles do the rest. The resulting layers are positioned where you want, the coordinate system used is that of the map (prefer 3857 rather than 4326 -in degrees-).
The offsets (varied according to the parameters chosen) in height of each cut simulate parallel or perspective views, a ‘radial’ vision attempts to get closer to the vision that an observer can have.
A ‘ridge line’ calculation enhances the reliefs.
- have an altitude raster image. different possible sources: https://dwtkns.com/srtm30m/, https://opendem.info, https://grindgis.com/data/free-world-dem-data
- to work in a projection whose unit coincides with the altimetric unit of the DEM (3857, WGS 84 / Pseudo-Mercator for example).
Author: Xavier Culos
More in english/french with examples: https://github.com/xcaeag/Dem-Slicer-Qgis-Plugin