2011/2/27 Martin Simon <grenzdebil@gmail.com>:
Hi!
This sounds like exactly the thing needed, as I create these Polygons seperately. :-)
I tried to build the patched mkgmap from source but this failed. But as the patch is committed now, I'll simply try with the next automatically buit version from the website.
OK, I was wrong; I now tried to build a map with contour lines generated by GroundTruth (commands: "GroundTruth.exe contours --gridlat=1 --gridlon=1 -b=50,6,51,7 -o=50-6.ibf" and "GroundTruth.exe ibf2osm -i=50-6.ibf"). Then I built a map from the resulting .osm file with a mkgmap style just for polygons. The Lines were closed, but unfortunately, not around the corners of the source file (the contour lines' start and end points are exactly at 50/51 degree latitude and 6/7 degree longitude). GroundTruth doesn't add "bounds" to the osm file, but adding it manually doesn't change the result. As the contour lines generated by Groundtruth are always running clockwise around a hill, what needed to be done is closing them from a lines' endpoint clockwise around the tile edges until the startpoint is reached *or* the startpoint of another contour line with the same tags is reached, merging them, and continue. I don't know at all how much work would need to done to implement this behaviour... --Martin