I think the maximum values should be as large as possible. When splitting planet, we have a huge tile covering
an area in the pacific, this tile has almost no nodes. If splitter has to create tiles with max. 20 degrees width
we probably see tiles without nodes.
Date: Fri, 30 Nov 2012 18:18:02 +0100
From: wmgcnfg@web.de
To: mkgmap-dev@lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] splitter maximum tile size
> Thorsten Kukuk wrote
>>>
>>> No, there is no limit for the maximum tiles size for now. Thanks for the
>>> hint.
>>> What is the limit? I guess it is not a constant, but depends on
>>> resolution
>>> and other
>>> values? Unfortunately the test data is gone and I didn't download it.
>>
>> If you want to look at the problem, I can try to regenerate the
>> data again.
>
> I am not sure if the problem has to be solved in splitter or in mkgmap.
> Anyway, please try to reproduce it.
> I also like to know why mkgmap has problems with tiles that contain only
> very few nodes. Or is it the gps device that has problems?
>
> Gerd
I played a little bit with a small testfile how large a tile can be. The
attached test file has the maximum size which works for me:
<bounds minlat="0.0" minlon="0.0" maxlat="85.0" maxlon="179.98"/>
Larger bounds cannot be put into a single tile.
For large tiles mkgmap requires much memory problem if the bounds
parameter is set. They need to be completely loaded with a high memory
consumption.
I don't know if there is a hard limit for the tile bounds size. Maybe
using some limits in splitter for the maximum latitude and maximum
longitude size would remove some problems, e.g. max lat = 20, max long = 20.
WanMil
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