[mkgmap-dev] Trouble getting somemultipolygons torender inmkgmap

Sat Sep 25 15:34:31 BST 2010

Wow, great work!
If you filter the types with decreased polygon numbers you get:

Residential
City Park
Large lake
Medium lake
Major river
Forrest

I *guess* that in most cases the multipolygon is tagged with name=XXX 
but not with the polygon tag (natural=* etc.). With patch 
mp_stricttagrule_v1 these polygons are tagged only with name=XXX but not 
with a polygon tag and therefore no rule in the style file matches.

But the difference (<1%) is not as big as I expected. Maybe it is time 
to commit the mp_stricttagrule_v1 to squeeze mappers to tag mps correctly.
Can you repeat your analysis for parts of europe?

WanMil

> Hi WanMil,
>
>
> Here is a spread sheet of the Polygon numbers using the default style with
> each unique patch version. Patched with Mkgmap r1706.
>
> The numbers are the total of each across all zoom levels.
>
> Also the total number of Polyline and Polyline roads are included.
>
> This is for Austalia. I understand if you need someone to try another part
> of the world due to different tagging schemes.
>
> Not sure why the Polygons have decreased with the patch that allows all
> tags. I ran each twice to check. Also I started from a fresh trunk download
> for each patch.
>
> Regards,
>
> Markus_g
>
>
>
>
>
>
>
> -----Original Message-----
> From: mkgmap-dev-bounces at lists.mkgmap.org.uk
> [mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk] On Behalf Of WanMil
> Sent: Saturday, 25 September 2010 7:18 PM
> To: Development list for mkgmap
> Subject: Re: [mkgmap-dev] Trouble getting somemultipolygons torender
> inmkgmap
>
> Thanks for testing it. Before committing I would like to compare hard
> facts. How many mps are handled ok with the extended polygon tag list
> and how many mps are handled with the non polygon tag list.
>
> Unfortunately I don't have time to do this. So anybody should feel free
> to start investigations.
>
> WanMil
>
>> I have tried the patch and have looked around Australia and I can't find
> any
>> problems. Seems to be a good addition as some multipolygons I have never
>> seen now appear in mapsource.
>>
>> Charlies missing multipolygons also now appear.
>>
>> Regards,
>>
>> Markus_g
>>
>> -----Original Message-----
>> From: mkgmap-dev-bounces at lists.mkgmap.org.uk
>> [mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk] On Behalf Of WanMil
>> Sent: Saturday, 25 September 2010 2:59 AM
>> To: Development list for mkgmap
>> Subject: Re: [mkgmap-dev] Trouble getting somemultipolygons to render
>> inmkgmap
>>
>>> WanMil schrieb am 24.09.2010 17:35:
>>>> The mp code must check if the mp itself contains the
>>>> relevant polygon tags or if the tagging should be taken from the outer
>>>> ways. For this purpose a list of known polygon tags is used and up to
>>>> now leisure is not in this list.
>>>
>>> My understanding of the multipolygons is, that the tags may EITHER be in
>> the
>>> relation OR on the outer polygons. So the outerpoylgons are only to be
>> used,
>>> when there are no tags on the relation.
>>> If the relation itself is tagged and there is a tag on the outerpolygons,
>> this
>>> does logical mean, that the outerpolygon tags apply to the complete area
>>> including the inner-area.
>>>
>>> There shouldn't be a list of concerned tags, since any area tags may be
>> used.
>>
>> I agree.
>> But the real world does not strictly follow this definition.
>> Unfortunately very lots of mps are tagged with some non polygon tags and
>> therefore I introduced the list of well known polygon tags. At least
>> this was neccessary when I implemented the mp code.
>>
>> You càn check yourself if it's now the time to remove this polygon list.
>> I have attached a patch that follows your proposal. Just test it and let
>> us know.
>>
>> WanMil
>>
>>>
>>> Gruss
>>> Torsten
>>
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>> mkgmap-dev at lists.mkgmap.org.uk
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>>
>
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