[mkgmap-dev] Optimizing MapSplitter

Thu Nov 13 10:58:52 GMT 2014

Hi Steve,

I played a little bit with display tool r435.
I was not able to  display the label in inkSkape.
Is there a trick?

I noticed that my Garmin maps have a rather small
avg. number of elements compared to those produced 
by mkgmap.
Up to now I found no simple rule reg. the area size of a sub div
and the contained elements.

Gerd

> Date: Wed, 12 Nov 2014 14:11:29 +0000
> From: steve at parabola.me.uk
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Optimizing MapSplitter
> 
> 
> Hi Gerd
> 
> As you've probably seen I've added the program to the display svn
> as test.svg.subdiv.Main. There is an argument '--level N' to display
> a different zoom level. Default is 0 (most detailed).
> 
> I've found that our OSM maps seem to have a lot more elements than
> other maps so it is difficult to compare.
> In general the way we create subdivisions means that many of them
> are quite large and they contain many elements.  There are no
> small divisions.
> 
> 
> 
> > If I got it right, the redraw time is influenced by
> > a) how many sub divisions are overlapping a given bbox and
> > b) how many objects are in these sub divisions  and
> > c) how complex the objects are (means, how much time it takes to render
> > them)
> 
> It is also possible that the way that the divisions on different
> levels link together may have an effect, as it may be able to
> restrict the number of divisions it has to consider.
> 
> ..Steve
> 
> 
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