[mkgmap-dev] Strange long distance routes on NüviFrom Gerd Petermann gpetermann_muenchen at hotmail.com on Mon Jul 31 08:04:09 BST 2017
Hi Andrzej, I looked at your patch and it seems reasonable to me but as a cyclist I'd prefer to use a different tag instead of mkgmap:good_road, maybe mkgmap:fast_road? Do you know how this patch influences bicycle routing? The special handling of highway=mini_roundabout is somewhat problematic because that tag should not be used on ways. I also would not use the type 0x0c for them, so I suggest to remove that rule so that our "mop up" rule catches them: # Mop up any unrecognised highway types highway=* & area!=yes [0x07 road_class=0 road_speed=0 resolution 23] Gerd popej wrote > Hi Bodo, > > I think Garmin is using some kind of hierarchical routing algorithm. It > looks like GPS uses only class 4 and 3 roads for long distances (at > least in case of recent nuvis, hiking GPS can be more flexible). For > proper routing GPS needs a continuous and reasonably dense notwork of > high class roads. > > My patch address 2 problems in default style. > > First are links and roundabouts, which often get lower road class than > connected roads. This breaks continuity of high class network and breaks > routing. My patch simply increases road class for many links and > roundabout types. > > Second problem is low density of good highways in some regions. To make > it better, my patch increases road class for international roads. These > roads are detected by "ref" and "int_ref" tags, both in objects and > relations. > > I have added some small general corrections for > "highway=mini_roundabout", "access=hov" and "oneway=reversible". > > There is no direct change for "inc\roadspeed". Maybe patch overrides > some of your changes in "lines" file? Anyway, I don't think road speed > breaks routing, you can tune it to your liking. > > -- > Best regards, > Andrzej > _______________________________________________ > mkgmap-dev mailing list > mkgmap-dev at .org > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev -- View this message in context: http://gis.19327.n8.nabble.com/Strange-long-distance-routes-on-Nuvi-tp5899825p5900068.html Sent from the Mkgmap Development mailing list archive at Nabble.com.
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