I wrote a little python script to set the elevation in the editor according to a digital elevation model. Those come in various resolutions, for instance, in Germany data for the whole of Northrhine Westfalia is available for free with a 1mx1m granularity. I then use PyAutoGui in order to automate setting the correcting height and clicking/scrolling in the editor. The script currently sets the height information for every square in the editor, not just contours. An example height map: