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[mkgmap-dev] multiple garmin elements from one osm element

From Felix Hartmann extremecarver at googlemail.com on Sun Jul 19 21:03:40 BST 2009

Torsten Leistikow wrote:
> Felix Hartmann schrieb:
>> Is there a big speed difference when using your patches?
> I haven't noticed any significant difference, but I haven't done any
> real comparison measurements.
> It certainly depends on the number of additionally created elements, but
> I think it will take some time, until the extended possibilities are
> really used.
> Right now I am trying to add a marking to highways with bridge=yes.
> Another idea would be to add a marking to all highways with a
> cycleway=track.
> Gruss
> Torsten
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If you know my maps ( http://openmtbmap.org ), you would know that I use 
3 layers and patched mkgmap via the rules reader file (older messages on 
this list) for me to reduce it down from 6 to 3 layers. continue/stop is 
definitely easier than patching the rule reader files for many things to 
continue, so my only fear is that going for continue/stop makes mkgmap 
slower. Since my main lines style-file got to around 80.000 lines 
because of checking several attributes for each possible line, speed of 
mkgmap reduces somtimes badly (about 500%plus on my older light styles 
consisting of only around 2.000 lines), even though most lines are only 
about getting additional attributes into the name. On gps map panning 
several layers provide speed improvements, therefore I would still 
continue with multilayer maps, but maybe go down to two layers if speed 

Could you try with/without your patches on germany.osm.bz2 from 
geofrabrik to see the speed difference (just record with timer in 

The main things I'm currently doubling are bridges, tunnels, sac_scale, 
mtb:scale, mtb:scale:uphill, trackgrade, several route types, cycleways, 
and some more but via my own patches I already got this down to three 
layers. other things to double would be rivers.
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