[mkgmap-dev] Problem for routing with different zoom levels

Tue May 21 06:29:43 BST 2013

Hi Geoff,

this will produce two routable lines (roads).
One is the transparent 0x0c and the other maybe the 0x02.
Both of them are routable, so there will be two alternative ways for the
routing algorhythm.
It will use the road with the better road class and road speed.

Ciao,
  Franco
Am 20.05.2013 20:31, schrieb Geoff Sherlock:
> OK, it seems if you mix zoom levels and routing things go wrong,
> changed style to thus. . .
>  
> highway=primary [0x10e0c level 3 continue]
> highway=primary [0x03 road_class=2 road_speed=1 level 2]
>  
> Routing works fine. I suggest it should be mentioned in the style
> document that lines only at higher levels should not use routable
> types; and not be routable, but I am not sure about the routable types
> part?!? But better to be safe than sorry.
>  
> But, another question, why does this work. . .
>  
> junction=roundabout [0x0c road_class=1 road_speed=1 continue]
> . . .
> . . .
> highway=trunk [0x10e0b level 3-4 continue]
> highway=trunk [0x02 road_class=3 road_speed=1 level 2]
> highway=primary [0x10e0c level 3 continue]
> highway=primary [0x03 road_class=2 road_speed=1 level 2]
>  
> Why does the routing on the roundabout (transparent line), followed by
> the routing later on - work?
>  
> G
> *From:* Geoff Sherlock <mailto:geoffrey_sherlock at btinternet.com>
> *Sent:* Sunday, May 19, 2013 6:26 PM
> *To:* Development list for mkgmap <mailto:mkgmap-dev at lists.mkgmap.org.uk>
> *Subject:* [mkgmap-dev] Problem for routing with different zoom levels
>  
> Not sure if anyone has spotted this before, as I have not been keeping
> a close eye on the mailing list lately.
>  
> I had the following defined in my style file; to show thinner lines
> for primary highways at different zoom levels:
>  
> highway=primary [0x1b road_class=2 road_speed=1 level 3-4 continue]
> highway=primary [0x03 road_class=2 road_speed=1 level 2]
>  
> This seems to have broken routing in Mapsource and on the device. I
> removed the first line and changed the level on the second to 3 and it
> worked fine (I assume 4 would have worked fine as well).
>  
> Is there a restriction on doing this type of thing regarding routing?
>  
> Geoff.
>
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