On Feb 17, 2009, at 19:35, Mark Burton wrote:
To test the inter-tile routing I used Mapsource (this has generally been a reliable indicator of routing success), and first created a simple route on an Autobahn within a tile. This worked correctly. I then added to the route another point on the same Autobahn, not far away, but across a tile boundary. Mapsource took longer to calculate the route, but then added a straight line between the last two points, instead of routing along the Autobahn.
Hmm, your test sounds good but the result wasn't.
I don't know if the boundary node code has ever actually been used before. Perhaps Steve or Robert can confirm whether it is known to work or not.
It's very barely tested: I created two small .mp-files with boundary node data, where some of the boundary nodes were actual junction nodes and some weren't. I loaded the combined gmapsupp.img on my GPS, and routing across tile boundaries worked partially; it seemed to work fine in the vicinity of non-junction boundary nodes. I didn't test this with MapSource. A first thing to do to confirm the patch does what it should would be to run two such tiles through test.display.NodDisplay and see if the NOD3-entries are what you'd expect. There should be one per boundary node. (Furthermore, the corresponding entries in NOD1 should have a flag set.) Cheers Robert