Enigma wrote:
> I recently upgraded the OS on my GPS
> computer and I am seeing a problem with mapnik maps. No
> matter how I load the data in osm2pgsql the maps in GPSDrive
> are off by about 10 meters to the north and 10 meters to the
> west. My GPS position, as well as tracks, POIs, waypoints,
> etc. are all displaced on the map by a few meters. I am
> using the latest SVN for GPSDrive, mapnik 0.6.0 and the OSM
> tools are from SVN. I have seen the issue where the no
> projection was used causing positions to be off by many
> kilometers, but this off by a few meters issue is a new one
> for me. Has osm2pgsql changed the projection they use like
> described here:
http://lists.gpsdrivers.org/pipermail/gpsdrive/2008-September/001420.html> ?
to be technical, I think that is a matter of datum transform rather than
map projection.
> Do I need to use an older version of mapnik or osm2pgsql
> to be compatible with GPSDrive? I am seeing this issue on
> 2 different computers so I don't think it is unique, is
> anyone else seeing anything like this?
I don't know if it applies to Mapnik support, but see this bug report:
http://sourceforge.net/tracker/?func=detail&aid=2203405&group_id=148048&atid=770280what map scale?
is it a constant 10m to N+W all over the map for all maps?
Hamish
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