[OSM-talk] Topology rules

[Martin Koppenhoefer]

2017-10-25 11:50 GMT+02:00 Tomas Straupis <tomasstraupis at gmail.com>:

> 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.
>



most important is IMHO: when do you share nodes, and when not.


1. E.g. political boundaries usually should reuse the same border ways (=no
gap between entities).

Other examples:

2. Buildings.
If 2 buildings share a wall or are constructed one aside the other (double
wall), you should have them connected in OSM as well.

If a square is delimited by buildings, the place=square object should share
ways with the buildings.
etc.

Some mappers tend to map these things very close but distinct, which IMHO
is a topology error.
The rule I want to see: map in a way that it represents reality nicely.

3. Roads and areas:
Some mappers connect "incompatible" object types (centre lines of roads and
areas). The areas should end at their border and not be extended.

Cheers,
Martin
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