[mkgmap-dev] merge-lines and routing

Mon Apr 29 22:37:45 BST 2013

On 28.04.2013 16:30, WanMil wrote:
>
>> My understanding is that routing is also done with the data of lower
>> resolutions, e.g. for long distance routing, but my patch below is probably
>> too simple, as it doesn't care about CoordNode.
> If that's the case and lower resolutions are used for routing I am quite
> sure that the merge-lines filter (and some other filters too) are doing
> harm.
>
>
I am pretty sure, that routing is only done at the lowest resolution. 
This doesn't have to be 24 - (but using mkgmap it actually has to be 24 
- Garmin City Navigator uses resolution 23).
Maybe confusion is caused by routable basemaps?

I would think for them the same principle of routing only using the 
lowest resolution/level is true.

In any case, if the above were true, then there would need to be routing 
information added too all levels - which I cannot really believe that 
Garmin would do it...