[OSM-talk] open question about boundaries sharing nodes with ways or nodes

[Martin Koppenhoefer]

2015-10-14 9:49 GMT+02:00 Badita Florin <baditaflorin at gmail.com>:

> This way is a highway and at the same time is part of the relation of a
> boundary. This seems invalid since it merges two types of features on the
> same way instead of keeping a logical separation between two different
> things. Is this a valid way? What if the highway is modified ? since the
> highway is not a legal boundary and just happens to overlap the real
> boundary, so if the highway  is changed for any reason, it will modify the
> boundary along with it.



This really depends on the definition of the boundary. If the highway IS
legally the boundary, the boundary might also change when the highway
changes (more likely for natural features maybe, like rivers, peaks or
coastlines). If instead the legal boundary is defined separately (e.g. by
coordinates or poles on the ground) and "just happens" to coincide with the
highway position then we should model 2 distinct features in OSM (and a
modification of the highway should not modify the boundary as well). You
cannot assume that the highway isn't the legal boundary unless you find the
actual legal definition for it and can verify the situation. Both
alternatives exist in the real world.

Cheers,
Martin
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