I've created terrain from real-life elevation data. It's something that really deserves a proper how-to, but I'll try to sketch the main points out here.
First thing you need is the real life data. For 90 meter resolution data for much of the planet, you can go to http://srtm.csi.cgiar.org/. For future reference, it's also possible to find data at a 30m resolution, but so far as I know it's only available for select parts of the United States at http://seamless.usgs.gov . Both sites offer the data in the form of a GeoTIFF file, and that's what you'll need. Neither site is particularly user friendly, so be prepared to poke at it for a while. Once you have that, you'll want to go and download a program called L3DT from http://www.bundysoft.com/L3DT/ . There is a free version of this program available there, and it can import a GeoTIFF and convert it into a greyscale heightmap suitable for OpenSim. It supports saving as a r32 file, which you can load into an OpenSim region from the console. Obviously, there's lots of little steps I haven't described. Happily, Bundysoft has a tutorial on turning a GeoTiff into terrain. It even shows you how to get the data you'll need. You can find it here: http://www.bundysoft.com/wiki/doku.php?id=tutorials:l3dt:srtm If you follow that tutorial, you should get pretty close. All you'll need to do is export the L3DT heightmap to r32 files sliced to 256x256 pixels in size, and then load each one into the appropriate OpenSim region with the console.
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