[mkgmap-dev] splitter removes multipolygon-tags

Sun May 11 11:46:44 BST 2014

Hi Henning,

yes, I think that can be done. 
Just to make sure: You don't want the shared tiles twice,
just two entries in different template.args?

Gerd

Henning Scholland wrote
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> Hi Gerd,
> 
> I created a example based on my map of Germany (highway=motorway) and
> Alps (highway=primary).
> 
> My thoughts are, that splitter creates based on these two polygons
> three temporary polygons. One containing area only touched by Germany
> (landuse=forest), one containing area only touched by Alps
> (landuse=farmland) and one containing area touched by both
> (landuse=military).
> 
> The result will be three list of tiles. The naming of tiles isn't
> important.
> 
> Also splitter should output two templates.args (for each input-poly
> one), as you already wrote. The file for Germany should contain all
> tiles in forest-area and military-area, the file for Alps military and
> farmland.
> 
> Henning
> 
> Am 11.05.2014 11:25, schrieb Gerd Petermann:
>> Hi Henning,
>> 
>> don't worry, splitter already contains a lot of code that is only
>> needed for the handling of overlapping tiles. I am not sure if I
>> got it right what you mean in your example. Would it be okay to
>> calculate the tiles for Germany and write them, and in a final pass
>> find all tiles which overlap the polygon for Hessen and copy those
>> with the mapids for Hessen? Or could splitter just create a
>> templates.Hessen.args containing something like mapname: 10000001 
>> input-file: 110000092.o5m mapname: 10000002 input-file:
>> 110000093.o5m mapname: 10000003 input-file: 110000094.o5m mapname:
>> 10000004 input-file: 110000098.o5m mapname: 10000005 input-file:
>> 110000112.o5m
>> 
>> This would safe some GB disk IO.
>> 
>> Gerd
>> 
>> 
>>> Date: Sun, 11 May 2014 11:15:29 +0200 From: 

> osm@

>  To:
>>> 

> mkgmap-dev at .org

>  Subject: Re: [mkgmap-dev] splitter
>>> removes multipolygon-tags
>>> 
>> Hi Gerd,
>> 
>> the flexibility is, that I actually can just add new areas to my 
>> areas.list and don't have to care about anything. If mkgmap throws
>> out a warning about too many nodes in a tile, I let splitter create
>> a new areas.list for the region and I can continue.
>> 
>> In the new workflow I then have to adjust the script, which copies
>> the multiple used tiles.
>> 
>> It would be very helpful, if splitter can do the copying of tiles.
>> 
>> Splitter detects overlapping areas in areas.list and handles these 
>> regions as a own polygon and is writing tiles for each map, which 
>> touches the overlapping area.
>> 
>> So for example, if a split a map of Hessen (10000000) and a map of 
>> Germany (11000000), splitter will use a polygon of Germany with a
>> hole at the place where Hessen-poly-file has a coverage and
>> Hessen-polygon.
>> 
>> So the resulting areas.list could looks like:
>> 
>> 11000001;10000001: .... 11000002: ....
>> 
>> So splitter is able to write the data of a tile in Hessen to the
>> map of Hessen and to the map of Germany.
>> 
>> Maybe such a system is a better and more robust solution then
>> handling overlapping tiles. But I don't want to made you code that
>> only for me.
>> 
>> Henning
>> 
>> 
>> Am 11.05.2014 10:49, schrieb Gerd Petermann:
>>>>> Hi Henning,
>>>>> 
>>>>> can you describe what flexibility you are loosing? Could
>>>>> splitter be improved ?
>>>>> 
>>>>> Gerd
>>>>> 
>>>>>> Date: Sun, 11 May 2014 10:46:31 +0200 From: 

> osm@

>>>>>> To: 

> mkgmap-dev at .org

>  Subject: Re:
>>>>>> [mkgmap-dev] splitter removes multipolygon-tags
>>>>>> 
>>>>> Hi Gerd, this is, what I'm thinking about to do, but on the
>>>>> other hand I'm loosing the actual flexibility. I think I will
>>>>> give it a try and will see, how it works.
>>>>> 
>>>>> Henning
>>>>> 
>>>>> Am 11.05.2014 08:24, schrieb Gerd Petermann:
>>>>>>>> Hi Henning,
>>>>>>>> 
>>>>>>>> If you don't mind to have a map of e.g. Germany which
>>>>>>>> also contains small parts of other areas, I think the
>>>>>>>> fastest way is this:
>>>>>>>> 
>>>>>>>> combine your *.poly files so that you have one
>>>>>>>> henning.poly that contains the areas for which you want
>>>>>>>> to create maps. Execute splitter with
>>>>>>>> --polygon-file=henning.poly --max-nodes=...
>>>>>>>> --stop-after=split --write-kml=splitter.kml planet.o5m
>>>>>>>> 
>>>>>>>> If you have an actual densitites_out.txt for planet,
>>>>>>>> you can also copy it to the working directory and
>>>>>>>> rename it to densities.txt. Splitter will use this file
>>>>>>>> instead of reading the planet.o5m, and the program
>>>>>>>> finishes within seconds.
>>>>>>>> 
>>>>>>>> As a result you have a kml file and an areas.list. The
>>>>>>>> next step would be to re-combine the areas so that they
>>>>>>>> build the maps that you want to create.
>>>>>>>> 
>>>>>>>> If you need the same tile for two maps, but with
>>>>>>>> different mapids, I suggest to copy the output file of
>>>>>>>> splitter. Maybe a small script is needed to perform
>>>>>>>> this step.
>>>>>>>> 
>>>>>>>> Gerd
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>>> Date: Sat, 10 May 2014 20:31:51 +0200 From:
>>>>>>>>> 

> osm@

>  To: 

> mkgmap-dev at .org

>>>>>>>>> Subject: Re: [mkgmap-dev] splitter removes
>>>>>>>>> multipolygon-tags
>>>>>>>>> 
>>>>>>>>> Hi Gerd, ok, so my next step will be to optimize my
>>>>>>>>> tiles.
>>>>>>>>> 
>>>>>>>>> Henning
>>>>>>>>> 
>>>>>>>>> Am 10.05.2014 17:27, schrieb GerdP:
>>>>>>>>>> Hi Henning,
>>>>>>>>>> 
>>>>>>>>>> I did not try what happens when 5 tiles overlap the
>>>>>>>>>> same point, but it should work. As I said, you
>>>>>>>>>> should try to avoid that, as each tile will require
>>>>>>>>>> the complete reading of the input file.
>>>>>>>>>> 
>>>>>>>>>> Gerd
>>>>>>>>> 
>>>>>>>>> _______________________________________________
>>>>>>>>> mkgmap-dev mailing list
>>>>>>>>> 

> mkgmap-dev at .org

>  
>>>>>>>>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
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>>>>>> 
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>>>>> 
>>>>> 
>>>>> 
>>>>> 
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