Andrew Ayre wrote:
Hi, I have a problem generating gmapsupp.img from two IMG files, previously generated by mkgmap. I'm probably doing something wrong, but I'm not sure what. Any help is appreciated.
I have two 1 degree square IMG tiles for a location in Austria. 63275058.img contains the OSM street map, and 53275058.img contains the SRTM contour lines. The tiles cover the same area. You can get them from here:
http://files.britishideas.com/index.php?dir=mkgmap/
If I run:
java -Xmx1560M -jar ../scripts/mkgmap.jar --gmapsupp ./63275058.img
then I can view the street map just fine. The file size is around 650kb.
If I run:
java -Xmx1560M -jar ../scripts/mkgmap.jar --gmapsupp ./53275058.img ./63275058.img
then the contour lines show up but not the street map. The file size is around 12Mb.
The SRTM Layer has to be transparent and its draw priority has to be higher than that of the OSM Layer. If you try to display two non-transparent layers only the one on top will show up. I use gmaptool to set transparency, AFAIK mkgmap cannot do this. You can use gmaptool for merging of IMGs, too. I did the same thing that you want to do for southern Germany: http://www.kleineisel.de/ralf/gps/garmin/