Model terrain from map and contour lines in Blender tutorial

In this tutorial I show you how to get a numerical terrain model (a basic height map), generate contour lines from it and use it to model your terrain in Blender. We'll be only using free software in this tutorial so I'm sure there are better ways to model it in Rhino + Grasshopper for example, but we'll do it in Blender today OK?
QGIS (free open-source software)
qgis.org/