[mkgmap-dev] mkgmap ToDo list

Fri Apr 25 20:19:46 BST 2014

Hi Henning,

it seems I still don't understand. 
The max-nodes values influences the number of tiles created. 
I don't see a big difference between a map for US consisting of 100 
or 250 tiles, esp. if the map doesn't contain routing info.

I would try to find a value that allows to utilize all CPUs
without reaching heap limits or img limits.

Why do you think that you have to find an optimal value?

Gerd

Henning Scholland wrote
> Hi Gerd,
> 
> finding a proper max-nodes value wont solve the problem globaly. Eg. 
> then you compare the needed value from europe/north america to the value 
> needed in the rest of the world.
> 
> Henning
> 
> Am 25.04.2014 19:35, schrieb Gerd Petermann:
>> Hi Henning,
>>
>> well, I don't know how well the number of nodes
>> in a tile correlates with the size of the img file,
>> but it seems to work for most users.
>> My understanding is that this should work as well for
>> a style which only processes a few details,
>> only the ratio between number of nodes and tile size
>> will be different, in other words, you have to find
>> out how much higher the max-nodes value can be.
>>
>> Gerd
>>
>>
>>
>> > Date: Fri, 25 Apr 2014 19:27:09 +0200
>> > From: 

> osm@

>> > To: 

> mkgmap-dev at .org

>> > Subject: Re: [mkgmap-dev] mkgmap ToDo list
>> >
>> > Hi Gerd,
>> > splitter is able to write a density file, which stores the density of
>> > OSM-nodes in the specific area. Afterwards the file is splitted and
>> > processed by mkgmap. mkgmap will use only the objects, which are
>> > addressed in style-file.
>> >
>> > Example: In a rectangle of 100x100m are 5 nodes belonging to a highway
>> > and 10 nodes belonging to POI, and polygones and style-file only
>> > contains highways, mkgmap writes only 5 nodes (and one line) to 
>> img-file.
>> >
>> > For an more effictive splitting of tiles I would imagine, that a
>> > density-file created by mkgmap based on the written data will be much
>> > better then the file written by splitter.
>> >
>> > Henning
>> >
>> > _______________________________________________
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>> > 

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>>
>>
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