[mkgmap-dev] mkgmap ToDo list

Sun Apr 27 15:51:52 BST 2014

Hi Henning,

some more remarks:
A factor of 2 is more or less the best value you can expect,
and it is likely that the factor is bigger.
Reason: splitter tries to create no tiles with 
a very small number of nodes, it will typically produce a few tiles
with nearly 100% of the max-nodes value and other other with
less than 50%. The log shows the values:
...
Area 63240082 covers (48.8671875,8.701171875) to (49.21875,9.0966796875) and contains 837131 nodes (52 %)
Area 63240083 covers (48.8671875,9.0966796875) to (49.04296875,9.4482421875) and contains 607941 nodes (37 %)
Area 63240084 covers (49.04296875,9.0966796875) to (49.21875,9.4482421875) and contains 1035670 nodes (64 %)
Area 63240085 covers (49.21875,8.4375) to (49.833984375,8.701171875) and contains 1541414 nodes (96 %)
...

As long as we create rectangular tiles you should not expect much better results.

Gerd

> Date: Fri, 25 Apr 2014 21:54:05 +0200
> From: osm at aighes.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] mkgmap ToDo list
> 
> Hi Gerd,
> 
> I would like to have img-tiles which have globally nearly the same 
> filesize, so that they use the space of devices like eTrex 10.
> 
> With my actual map I use globally the same value for max-nodes. But the 
> size of the img-tiles differ more then factor 2. Eg. a tile in Germany 
> is between 2 and 5 mb where a tile in China is about 10 mb. If I remove 
> details, this difference will increase, because in Germany more objects 
> will be removed from the img-tile then in China.
> 
> Henning
> 
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> mkgmap-dev at lists.mkgmap.org.uk
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