I have here two blog posts that provide the basic information needed to get your map into GRASS for further analysis.
Frequent side-treks into Image Magick, planetGenesis and other good stuff.
• Smoking GRASS
• Smoking More GRASS
Comments are greatly prized. If you like what you see, don't forget to rate this thread!
If you don't, then feel free to forget...
Astrographer - My blog.
-How to Fit a Map to a Globe
-Regina, Jewel of the Spinward Main(uvmapping to apply icosahedral projection worldmaps to 3d globes)
-Building a Ridge Heightmap in PS
-Faking Morphological Dilate and Contract with PS
-Editing Noise Into Terrain the Burpwallow Way
-Wilbur is Waldronate's. I'm just a fan.