[mkgmap-dev] [PATCH v5] - min arc length fixes

Sat Aug 29 11:46:49 BST 2009

Hi Garvan,

> I spent some time testing short arcs and managed to find some routing 
> problems where mapsource will route in one direction but not in the 
> reverse direction. This looks like a mapsource bug to me, so I am 
> curious if it is seen with all versions of mapsource, or even if others 
> can reproduce it. I tested with version 6.13.7 of mapsource, and builds 
> 1143, 1155 and 1155 with the v5 patch of mkgmap.
> 
> The test map is tiny, so you may have trouble finding it unless you use 
> the gdb file. Its someplace over Malaysia (N1 19.785 E103 28.403). Note 
> that the coordinates were very carefully chosen to select the maximum 
> length arc that demonstrated this problem. The length of the short-arc 
> shown in gpsmapedit is 5.4 m.

Using 1155, routing in either direction using the points in
route_error.gdb, it routed the short direction. When you load
route_error.gdb into mapsource it does show the route going the long
way but if i  then ask it to recalculate the route it goes the short
way. This is for car routing either shortest distance or quickest time.

Mapsource 6.15.6

So, it appears to work Ok for me.

Cheers,

Mark