...Maybe this link is interesting? http://terrain.party/ ...
Hans

In a totally different context I was told that NL and probably others now share and aggregate different geographic data-sets. I did not get the details, but apparently the data should be open for use. I did not have time to explore further, but jotted down a link oscity.eu oscity.nl - neither of which I can get through to right now. But I did find the demo video from Holland with 5cm contour lines at https://vimeo.com/114556973.

Even if I managed to find the data-sets, transforming them to decent 3D terrain models would be beyond me, not to mention that 5cm resolution is way too detailed for any processing power I have. What is interesting though, is that based on these data-sets it should be possible to generate very accurate terrain models for use with SH3D.

ok