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I guess he could use DEMs, like Railroad Tycoon 2, where the compressed routes were based on 30 arc sec data, IIRC, first generation data in the public domain. For Trainz he could try MicroDEM/HOG as that approach discards all geo coordinates in the process and he is free to compress to any scale he likes.OP's best bet would be to try and apply the American Truck/European Truck 2 Simulator approach and try to build a compressed version. ATS uses a scaling factor of 20:1 outside towns and cities so even there you would be looking at 150 miles and of course you would have to sculpt the terrain by hand as you couldn't really use DEM data.
Have you ever considered putting a compression feature into Transdem, Roland? We were discussing this the other week as the key would be how much you compress the heights vs. the x and z planes to avoid all the hills looking like termite nests! I'm still pondering how they do it in ETS2, particularly ProMods where the E69 road up to Honningsvag captures the essence of the scenery but in a fraction of the real distance with the mountains and cliffs not looking out of proportion.
I have no idea.Edit: Is HOG even available these days? The only site I could find was carrying files from the early '00's!
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