[mkgmap-dev] tile size?

Sat Mar 21 17:42:35 GMT 2009

Hi Lambertus,

Can you provide the splitter area.list you have used for your online  
map? I have downloaded a view tiles and inter tile routing fails for a  
route crossing more than 3 tiles.
I would like to compare it with my tiles based on exact same osm file  
to make sure it's not the input data.

which options are you using for mkgmap?

thanks

On 20 Mar 2009, at 7:04 , Lambertus wrote:

> I am planning to do manual splitting only if necessary and use a  
> simple divide by half scheme but with horizontal or vertical  
> selection when doing so (and thus have only some influence on the  
> position of the split). I am certainly not planning on manually  
> dividing the whole world by hand.
>
> Routing between tiles should "just work (tm)" imho so very careful  
> tilesplitting should not be needed.
>
> Mirroring the maps is ofcourse no problem but they update each week  
> and bandwidth is not a problem (yet, at least). So I don't know how  
> effective mirroring actually is.
>
>
> Marko Mäkelä wrote:
>> Hi Lambertus,
>> On Fri, Mar 20, 2009 at 09:12:01AM +0100, Lambertus wrote:
>>> North and South America split fine with max-nodes set to 120000.  
>>> Europe  still gives a few errors with that setting though. See the  
>>> results of a  complete world splitted with the 120000 setting  
>>> here:  http://garmin.na1400.info/routable.html
>>>
>>> I plan to split the remaining failed tiles manually.
>> Are you planning to fine-tune the tile division by hand?  If so, I  
>> would
>> suggest that you avoid splitting South Finland or North Estonia in  
>> the
>> west-east direction.  Given that there could be some inter-tile  
>> routing
>> issues (suboptimal routes chosen), it would be better to have a  
>> tile border
>> on the Baltic sea between Finland and Estonia.
>> I don't care which tile the Åland islands are on; they are roughly
>> halfway between Sweden and Finland anyway.  Although they belong to
>> Finland, they are autonomous and tightly connected with Sweden.
>> For what it is worth, my Finnish Garmin map generated from  
>> finland.osm.bz2
>> at http://www.polkupyoraily.net/osm/ uses this areas.list:
>> 63240001: 2768896,890880 to 2916352,1472512
>> #       : 59.414063,19.116211 to 62.578125,31.596680
>> 63240002: 2916352,890880 to 3020800,1472512
>> #       : 62.578125,19.116211 to 64.819336,31.596680
>> 63240003: 3020800,890880 to 3266560,1472512
>> #       : 64.819336,19.116211 to 70.092773,31.596680
>> The reasoning is that most of the population is located in the south,
>> and therefore the south must be a single tile.
>> Similarly for Estonia, most population should be in the mainland,  
>> near
>> Tallinn.  You could put the Saaremaa and Hiiumaa islands on a  
>> separate
>> tile without losing any routing functionality.
>> I hope that you consider this suggestion.  If it works out well, I'd
>> like to set up a mirror to your map tiles instead of generating the
>> tiles myself.  (I only have a 32-bit machine on a 1 Mb/s ADSL line.)
>> 	Marko
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