[mkgmap-dev] [PATCH v4] Multipolygon code enabled for overlapping lines

Mon Feb 15 17:10:13 GMT 2010

> Hi WanMil,
>
>> Compared to v3 (posted by Carlos in thread "Wrong multipolygon
>> warnings") some unused debug messages have been removed.
>>
>> The patch enables the multipolygon code to process multipolygons with
>> overlapping lines.
>
> For the Geofabrik Finland extract of today, the patch reduces the
> amount of log output from 198129 to 195563 bytes.
>
> If I specify --generate-sea=multipolygon I will get 1887595 bytes of
> log, including 3814 warnings 'is not processed due to an unknown
> reason'.
>
> Normally, I get only one 'unknown reason' warning, for a monster
> multipolygon that I created some days ago:
> http://www.openstreetmap.org/browse/relation/404644
>
> WanMil, can you please take a look at that multipolygon and improve the
> code or diagnostics? That multipolygon could be easily split near
> Ihanteensalo, but I will leave it as is for now, so that the problem
> can be diagnosed.
>
> 	Marko

Marko,

I downloaded the finland OSM dump from geofabrik from today (Feb 15th).
I used splitter v105 and the areas.list file from 
http://www.polkupyoraily.net/osm/ to get three tiles.
Then I tried that patch:
* I got no warning for mp 404644
* I got only one "unknown reason" warning for complete finland

Apart from improving handling on the tile boundaries (which will be 
another main patch) I don't see anything to improve.
Did you really use the patch?

WanMil