[mkgmap-dev] Process for Creating Contour Maps?

Does someone have wiki pages describing the best procedure to create contour maps for Garmins? It seems like a number of people are having some success but it doesn't seem to be very well documented. I'm working though trying to get groundtruth to generate .osm files with contours in them and then using mkgmap to create an .img file but mkgmap is segfaulting. In any case though, I'd like to get contour maps using better data than the STRM that groundtruth uses. My ultimate goal is to generate contour maps for a trip out to the Grand Canyon this summer. -- Jeff Ollie