[Tagging] Relation for saying "x is attached to y"?

M∡rtin Koppenhoefer dieterdreist at gmail.com
Mon Aug 30 16:34:58 BST 2010

2010/8/30 Steve Bennett <stevagewp at gmail.com>:
> Yep. Polygon collisions can also be accidental, like when two objects
> from slightly different sources (say one gps, one aerial imagery) are
> near each other.

I'd consider this mapping failure actually. More than believing in
gps- and imagery-precision the mapper should care about topology.

> Other generic relation types that would be very useful:
> - "these objects are mutually accessible by foot" (to avoid having to
> invent artificial foot paths in order to get good routing)

you can do this with the area-relation (not restricted but restrictable to foot)

> - "these objects express the same thing as that object but in more
> detail" (eg, one line representing a pair or more of train lines)

interesting, but maybe difficult to do.

> - "these objects are one" (like a very generic multipolygon, could
> also work to form "multiways")

can't you already do this with current multipolygons? (OK, only for
areas, for ways there are routes).


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