2017-10-25 11:50 GMT+02:00 Tomas Straupis <[email protected]>: > 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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