[mkgmap-dev] Inter-tile routing failures - not all our fault?From Valentijn Sessink valentyn at blub.net on Fri Aug 14 08:10:10 BST 2009
Mark Burton schreef: > There is a particular failure of inter-tile routing that we have seen > quite often which is that it fails to find a route when the source and > destination are in the same tile and the only (sensible) route is via > another tile. (If a sub-optimal route that only uses the source tile is > available that will get used.) Maybe we should investigate one such problem really thoroughly? I've also been thinking that a map with all of these problems would be a good idea, but I don't know if that would be feasible. Pro: have all problems in one, easily compilable, easily editable map; this map being small and exchangeable (by e-mail or svn). Con: the need to maintain this map; in fact, many of the corner cases will only be transferrable to this testmap once you know what to transfer, which is probably 90% of the investigation. What do you think? > Well, I naturally assumed that this was caused by mkgmap doing > something wrong but I'm not so sure now because I have been looking at > the free nz mapset that is generated using cgpsmapper and that exhibits > exactly the same behaviour as our maps do in this respect. They're built on the same reverse engineered information, aren't they? > So, either the bug is in mapsource (and all Garmin GPS units?) or mkgmap > and cgpsmapper are both getting it wrong in the same way. As said before (in the first A, B, C routing problem), my Garmin Nuvi will take routes that Mapsource won't. Also, the first problem had to do with three tiles, MapSource unwilling to route from tile A to tile C through tile B on a specific road. So we're not sure if it's Mapsource, mkgmap & cpsmapper, or some subtle interaction between all three. V. -- Durgerdamstraat 29, 1507 JL Zaandam; telefoon 075-7074579
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