Oh if what you’re looking for is terrain modeling, then that’s something else that I’ve done. I was originally thinking of ways to store terrain data in a database, but I found that an uncompressed JPG that is loaded into memory acts much more efficiently than making calls to a database, and can have variable sizes and resolutions.
This example uses the Python Imaging Library (PIL) to allow the ability to create a terrain flyover (although not in realtime because I’m using a 21583x16016 pixel image which is about 1.8GB of uncompressed data) at 15 meter+ resolution. The pixels are also linearly interpolated if you zoom in past 15 meters.
I’ve included all the instructions you should need to run this in Blender- as long as you provide your own image. All you’ll need is an installation of Global Mapper to make your image. You will also need to install Python 2.3 and the corresponding Python Imaging Library- with their paths set in the PYTHONPATH environment variable (Check out the python & plugins forum for a sticky on how to do this).
Here’s the 1.23MB download: