[mkgmap-dev] [PATCH v1] - Route centre tweaks

Tue Sep 22 13:44:49 BST 2009


Mark Burton wrote:
> Thanks to those who have tried yesterday's table A patch. Seems like it
> hasn't caused any problems (so far).
>   
After playing around a bit on my Vista HCx I did notice slightly 
different routing too. The maximum distance that it manages without 
"route calculation error" did not change however.
> Today's offering includes the table A tweak but it also increases one
> of the limits that determine when a route centre needs to be
> sub-divided. As far as I can tell, the limit was somewhat smaller than
> it should have been. So with this patch, fewer routing centres should
> be required (obviously depends on the map data).
Routing in Mapsource is now different too. So far I have found one route 
that does not calculate with the old version, but with the new. The 
difference is however 2-3 more turns, so no drastical improvement. Maybe 
some routes also degrade?
>  
>
> So please test this patch (it replaces the previous patch) and let me
> know if their are any issues.
>
> You must enable assertions, otherwise if the data structures overflow
> you won't know until mapsource/gps barfs.
>
> Cheers,
>
> Mark
>
> BTW - if you are not interested in routing over footpaths, changing
> them to a non-routable type will simplify the routing data further.
>   
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