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

Wed May 7 05:49:47 BST 2014

Hi Felix,

reg. speed: I can't reproduce that. I compared a split of Germany, 
both versions (r321 and r325) are more or less running the same time.
(I've executed both programs two times to make sure that disk caches 
are not causing big differences)

Or did you mean the combination of splitter + mkgmap to process e.g. Asia?

Gerd

Date: Tue, 6 May 2014 18:22:00 +0200
From: extremecarver at gmail.com
To: mkgmap-dev at lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] splitter r325: improved split algo and new option

    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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    -- 
keep on biking and discovering new trails

Felix
openmtbmap.org & www.velomap.org

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