[OSM-talk] Topology rules

[Richard]

On Wed, Oct 25, 2017 at 12:50:40PM +0300, Tomas Straupis wrote:
> Hello
> 
>   For a long time I wanted to hear opinion on the topic of topology rules.
> 
>   By "topology rules" here I mean just simple rules such as:
>   * polygon X should not overlap polygon Y
>   * polygon X should always be above polygon Y
>   * point X should be not further from line Y than D
>   etc.

you are thinking too abstract and trying to do too many things
at a time. 


>   * it would be easier for cartographers or the like. They would not
> have to guess which polygons should be above which ones in drawing
> order, for example when creating garmin maps it is not always possible
> to control the order of layers, so we have a question which goes
> first: forest or water? 

quite clearly described here: 
  http://wiki.openstreetmap.org/wiki/Key:layer#Data_consumers

Water and forest is allowed to overlap. OSM landcover model is insufficient
and mildly broken. Fixing it is not so easy.

Richard
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