On Fri, Aug 14, 2009 at 2:44 PM, Greg Troxel<gdt@ir.bbn.com> wrote:
I most recently built with all 6 NE states (conn, ri, mass, vermont, new hampshire, maine) all together, invoking the script 'do-mkgmap' which follows as something like
$ do-mkgmap *.osm.bz2
In this case, routing will not work across state boundaries. You know that though, right? I compiled Massachusetts and experimented with routing in Mapsource (I will try Roadtrip later). I found that routing only works for very short distances (even without crossing tile boundaries). For example, I tried the I95 around Boston. There, I could only route along segments which were less than 1 km long. It seemed, although I have not tested enough to confirm, that it was hardest routing along the more curved sections of highway. This would support the hypothesis that the node density is too high for proper routing. I have not had time to download the OSM data to take a look. I wonder if a way simplification patch could help here. I'm surprised that you were able to create routable maps using --max-nodes=1600000. I had to lower max nodes to 800000 in order to compile. Cheers.