>If you want to generate a synthetical DEM, you can use > >r.surf.fractal > >http://www.geog.uni-hannover.de/grass/grass5/html_grass5/html/r .surf.fractal.html > >It generates DEMs from given fractal dimension. Thank you for the reference Markus. Hopefully I'll have time to play with it after this part of my project is complete. :) -matt