Jeffrey Ollie schrieb:
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. Dear Jeffrey,
there are two different approaches: - Using srtm2osm to generate contour lines as osm files. - Using mkgmap to generate the contour lines directly. In both cases you'll need appropriate entries in your style file to determine which contour lines are mapped to major/medium/minor contours (0x22, 0x21, 0x20). I use # Contours take their name from the elevation setting. contour=elevation & ele ~ '\d*[02468]00' { name '${ele|conv:m=>ft}'; } [0x22 resolution 18] contour=elevation & ele ~ '\d+[05]0' { name '${ele|conv:m=>ft}'; } [0x21 resolution 21] contour=elevation { name '${ele|conv:m=>ft}'; } [0x20 resolution 23] for this purpose. Currently, the internal generation of contour lines can only cope with maps fitting into a single data tile. It can read SRTM geotiffs, ASTER geotiffs and HGT files. I use the following options: --contours --dem-type=ASTER --dem-increment=20 --dem-maxlevels=200 --dem-path=ASTER Hope that helps Christian