[mkgmap-dev] bug in rendering of relation=multipolygon?

Thu May 31 18:53:50 BST 2012

Hi Michael,

the OMS wiki tells the important fact about multipolygon tagging 
(http://wiki.openstreetmap.org/wiki/Multipolygon#Tagging):
"If relation is not tagged, the drawing style of outer ways is used."

The relation metioned by your were tagged - they had a name tag. So 
mkgmap uses the tags of the relation for the multipolygon and not the 
tags of the outer ways.

Having only a name tag the outer areas are not included in the compiled 
map because there is no rule for polygons with a name tag only.

WanMil

> http://www.openstreetmap.org/browse/relation/6128
> http://www.openstreetmap.org/browse/relation/58910
>
> these 2 relations describe a forest in germany, the forest being the
> outer polygon, clearings, a quarry and so on the inner ones. the
> relation istself has (actually had, i corrected it just now) only
> type=multipolygon and a name. mkgmap renders all the inner polygons, but
> only some (randomly, can't find a significant difference) are cut out of
> the surrounding forest.
>
> as soon as the relation has a landuse=forest, everything works as expected.
>
>
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