[mkgmap-dev] Splitter

Sun Aug 3 09:33:07 BST 2014

Hi all,

I got no feedback on this. Please help me to decide how to fix
the open splitter problems.

Gerd

GerdP wrote
> Hi,
> 
> we have two conflicting goals in the splitter algo:
> 1) create tiles with a small aspect ratio (target : < 1:4)
> 2) create tiles with similar number of nodes
> 
> I have no idea which one is more important.
> 
> A few possible solutions for the tile which has 1.112.635 nodes and a
> height of 288, width of 89 grid units:
> Vertical split at 269: 2 tile(s). The smallest node count is 23499 (4 %),
> the worst aspect ratio is near 3.92
> Vertical split at 280: 2 tile(s). The smallest node count is 187764 (33
> %), the worst aspect ratio is near 9.27
> Vertical split at 284: 2 tile(s). The smallest node count is 503112 (90
> %), the worst aspect ratio is near 18.5
> Horizontal split at 79: 2 tile(s). The smallest node count is 528774 (95
> %), the worst aspect ratio is near 30.91
> 
> Any idea? 
> In the past, we tried to reduce the aspect ratio because routing over tile
> boundaries caused trouble.
> Is that still important? Or is it just a cosmetic problem now?
> 
> Gerd
> 
>> Date: Thu, 3 Jul 2014 20:41:05 +0200
>> From: 

> osm@

>> To: 

> mkgmap-dev at .org

>> Subject: [mkgmap-dev] Splitter
>> 
>> There is a ~20MB o5m file that needs to be split. But Splitter returns:
>> 
>> "Cannot find a good split with exactly 2 areas"
>> 
>> I hope a (the) dev can have a look at this? Thanks!
>> 
>> The tile is here: 
>> http://osm.pleiades.uni-wuppertal.de/garmin/20140703/63240007.o5m
>> 
>> See for more info and a link to the o5m file:
>> http://forum.openstreetmap.org/viewtopic.php?pid=434024#p434024
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>> 

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