[OSM-talk] area_with_holes as alternative to multipolygon relation

[Frederik Ramm]

Hi,

> The most important thing from this is to tag things accurately. No
> layer=1 to get a lake rendering above a forest. No reliance on
> natural=land rendering over the top of a forest to make clearings. If
> there's no forest a given location, then it mustn't be within a forest
> area. Simple, straightforward, accurate.

Agree.

It helps to think about other uses than rendering. Say you want to  
calculate the total forest area - if someone just painted a patch of  
land with layer=1 above a forest then the underlying forest will  
still be counted. Worse still, if someone painted a lake with layer=1  
above the forest and then a forested island onto that lake, the  
island's forest area will count twice ;-)

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00.09' E008°23.33'