[mkgmap-dev] tile size?

Sat Mar 21 19:26:32 GMT 2009

I've added links to the template.args files on the routable Garmin map 
page (scroll a bit downwards).

I use Mkgmap twice, once for creating the Garmin map tiles from the OSM 
data and once for generating the gmapsupp.img and tdb file. The first 
commandline is:

java -Xmx2048M -jar /home/lambertus/garmin/utils/mkgmap-r983/mkgmap.jar 
--latin1 --description="OSM World Routable" --net --route -c 
template.args --series-name="OSM World Routable"

The second:
java -Xmx2048M -jar /home/lambertus/garmin/utils/mkgmap/mkgmap.jar 
--description="OSM World Routable" --product-id=53 --tdbfile --gmapsupp 
*324*.img

Apollinaris Schoell wrote:
> 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
>>> _______________________________________________
>>> mkgmap-dev mailing list
>>> mkgmap-dev at lists.mkgmap.org.uk
>>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
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