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

From WanMil wmgcnfg at web.de on Thu May 31 18:53:50 BST 2012

Hi Michael,

the OMS wiki tells the important fact about 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.


> 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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