[mkgmap-dev] RFC: Consider heightmeters for routing

Tue Apr 7 09:37:40 BST 2009

I thought about that one too, but wouldn't that need a complete rewrite 
of the style system?
You could solve it by reading in all streets, checking them for 
inclination, and then upon the inclination/height difference between 
every intersection provide a incline key, that you can then call upon in 
the style-file.
I still wonder though about the amount of cpu power needed to get that 
data - knowing that my pc calculated about 12 hours (Pentium M 2.26GHz, 
by that time 2GB RAM, harddisk with 60MB/s average write, 65 read) on 
converting SRTM1" into Garmin contourlines with 10m seperation - for 
Austria only.

Ralf Kleineisel wrote:
> Johann Gail wrote:
>
>   
>> So my idea is, to virutally lengthen the roads by the height distance.
>> This is, if a road has 1km and goes straight then it gets an entry of 1
>> km in the routing data.. If another road has a length of 1km and a
>> height difference of 10m, then it gets a length entry of 1.1km.
>>     
>
> Have you thought about changing the road_speed instead of the length? I.e. a
> road going up/downhill would get a lower road_speed than a flat one and when
> calculating a fastest route the Garmin should prefer the flat one.
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>   
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