[mkgmap-dev] [PATCH v1] Improved tagging of multipolygons

Fri Oct 15 22:07:39 BST 2010

The patch fixes the following tagging:
polygon A: leisure=nature_reserve (the complete area)
polygon B: natural=water (only the inner area)
multipolygon relation: natural=wood and outer=polygon A and 
inner=polygon B (only the surrounding area)
=> See also thread 
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2010q3/009112.html

The patch fixes also problems with cascaded multipolygons.
MP1:
outer P1 [natural=wood]
inner P2 [natural=water]

MP2:
outer P2 [natural=water]
inner P3 [natural=sand]

Without this patch P2 was added twice to the map. Once with the complete 
polygon area and once with the cut out P3.

I think this patch will also make it possible to remove the unlovely 
tag-removal-map used by the multipolygons. But first I have to check 
that in deep.

Please test this patch carefully with some of your well known 
multipolygons! I would not be surprised by the patch containing some 
unwanted stuff...

WanMil
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