[mkgmap-dev] splitter r325: improved split algo and new option

Tue May 6 17:41:27 BST 2014

Hi Felix,

fine :-)

And yes, I meant max-nodes may have to be decreased, not increased. Sorry
for the typo.
Reg. speed: That's unexpected. It should not take much time to find the
better split,
(a few seconds) and typically safe some time to have fewer tiles.
I'll check that tomorrow.

Gerd

Felix Hartmann-2 wrote
> Seems to be much better now. I don't think I can increase the max-nodes 
> value though, but for most maps the new algo creates less tiles for the 
> same max-nodes value (e.g. Austria from 43 down to 35 for me, with the 
> smallest tile now around 5MB instead of 2.8, and the biggest 12MB 
> instead of 11MB, for Asia I simultaneously increased max-nodes from 800k 
> to 900k- so I'm down from 624 tiles to 493.... and size from 970KB-16MB 
> to now ). So it still seems to depend on the country, but it's already a 
> lot better...
> It's a bit slower (about 10% more time)
> 
> On 06.05.2014 13:56, Gerd Petermann wrote:
>> Hi all,
>>
>> I've applied num-tiles-v1.patch  and improved the split algo, see
>> http://gis.19327.n5.nabble.com/mkgmap-ToDo-list-tp5803388p5805165.html
>>
>>
>> It is now less likely that splitter creates tiles with a low number of
>> nodes, it is more likely that all tiles have nearly  the same number 
>> of nodes,
>> and typically you will see fewer tiles.
>> Maybe this also means that you can increase the max-nodes value.
>>
>> I hope this also reduces the need for complex interactions between
>> spltter and mkgmap.
>>
>>
>>
>> Gerd
>>
>>
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>> 

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> 
> -- 
> keep on biking and discovering new trails
> 
> Felix
> openmtbmap.org & www.velomap.org
> 
> 
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