[OSM-talk] Example of Multipolygon Lake/Islands?

[Igor Brejc]

Ævar Arnfjörð Bjarmason wrote:
> On Sat, Sep 27, 2008 at 10:50 PM, Gustav Foseid <gustavf at gmail.com> wrote:
>   
>>> Hi Can anyone provide a permalink to an example of a lake that uses the
>>> multipolygon relation to handle islands? I remember having a link to such an
>>> example a while ago but I seem to have lost it.
>>>       
>> http://www.openstreetmap.org/?lat=59.882&lon=10.83435&zoom=16&layers=B000FTF
>>
>> Regards,
>>     
>
> I don't tag islands in the middle of lakes like that, I just use
> coastline without a relation. Where can I read about the advantages of
> doing it this way?
>
>   
There were a lot of (lengthy) discussions about it on this list. I guess 
the main advantage is that you specify a lake more precisely in physical 
terms - it consists of water and islands inside the lake. Just using 
higher layer tags for island is more of a hint for rendering software 
and does not specify any relation between the lake and its islands.

Igor