On Thu, Feb 19, 2009 at 12:19 PM, Robert Vollmert <rvollmert-lists@gmx.net> wrote:
If you shift this additional point towards the destination, is there a specific point where it starts going wrong?
It seems that as I approach or cross the boundary to the last tile, the route starts to go wrong (the route crosses four tiles in total). I will try to create a better test case, which can be more easily reproduced. So far the behaviour seems to be as follows: 1. If the additional point is well inside the second-last tile, the route is calculated correctly. 2. If the additional point is close to the tile boundaries of the last and second-last tiles, the route is calculated as two straight lines. 3. If the additional point is well inside the last tile, the route is a straight line from the start to the additional point, but the route is calculated correctly from the additional point to the destination.
One possibility is that the routes are just getting too long. I remember somebody saying there's a limit on the number of legs when routing using Garmin units.
I tested the same route on a map created with cGPSmapper which was produced with similar, but older OSM data (available here: http://emexes.powweb.com/osm/). In this case, the route was calculated correctly. I am however not sure what can be deduced from this observation. Thanks again!