[OSM-talk] Best way to draw areas with holes?

[Chris Hill]

 Jukka  Rahkonen wrote: 



>Some area  features would be drawn in GIS world as polygons with holes but that is not  well supported by OSM data model.
>I mean, for example, landuse which has  islands with some other landuse or big buildings having inner courts or  patios.  
>I have seen that users have solved this in many innovative  ways but most of them seem to lead to more or less odd rendering
> at least in  case of buildings..  Is there any recommended way to draw and tag this kind  of objects?  
>To draw an area in the halves, or delineate a building as a  fat loop sharing some points at a seem (non-existing in real world) 
>to make  it look like a closed area, or what?

 

I have used the multipolygon relation to draw islands in rivers.  It is specifically intended for drawing holes in areas and worked very well for me.

Cheers, Chris










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