[OSM-talk] area_with_holes as alternative to multipolygon relation

[Igor Brejc]

Martijn van Oosterhout wrote:
> On Mon, Mar 3, 2008 at 10:21 PM, Robert Vollmert
> <rvollmert-lists at gmx.net> wrote:
>   
>>  I think the problem I'm trying to address clearly:
>>
>>  To map a lake in a forest area, I should currently create both a
>>  closed way with natural=water, and a closed way that is an 'inner'
>>  member of the forest's multipolygon relation. Both of these ways
>>  share the same nodes (and may or may not need to be oriented in
>>  special ways).
>>     
>
> Hmm, I thought you could use the inner natural=water as the boundary
> of the forest? Does this not work?
>
> FWIW, I'd just had a layer=1 to the lake and forget about the multipolygon.
>
> Have a nice day,
>   
That's fine if you look at OSM data from the presentation viewpoint 
only. But what if sometime in the future somebody wanted to calculate 
its surface area? ;)

Igor

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