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[mkgmap-dev] routing seems to depend on order of ways

From WanMil wmgcnfg at web.de on Sat Dec 28 21:34:59 GMT 2013


I have commited the new (undocumented) option --x-no-mergeroads to 
disable merging of roads. I think this is useful for chasing problems.


> Hi Steve,
> I think I found a very old bug in mkgmap, it seems to exist since at
> least r2210.
> I found it while testing a patch for r2914 and found it in all older
> versions that I tried.
> Attached are two test files and a gdb for MapSource.
> The command that I use:
> java -jar d:\mkgmap\dist\mkgmap_r2889.jar --link-pois-to-ways --route
> --nsis --tdbfile --preserve-element-order  f:\osm\good.osm
> or
> java -jar d:\mkgmap\dist\mkgmap_r2889.jar --link-pois-to-ways --route
> --nsis --tdbfile --preserve-element-order  f:\osm\bad.osm
> The only difference in the two files is the order of the ways w3 and w4
> (the ids don't seem to matter)
> I use r2889 to test this because current trunk version uses a sort in
> the RoadMerger, but the error is not related to the merge.
> With bad.osm MapSource calculates a route that that passes the target
> point, goes up to the barrier and then reverses back to the target.
> This happens with vehicles like car and bike and seems not to be related
> to any routing preferences.
> I hope you can reproduce the problem and find out what goes wrong...
> Gerd
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