[OSM-talk] Topology rules

[Janko Mihelić]

I like the idea of formalizing OSM topology!

An example: power lines should share nodes with nothing except power
towers, portals and buildings (substation buildings).

A problem i find is with landuse=forest. Formally, those are zones that are
used for growing trees. But practically in OSM, that tag is used for any
land that is covered with trees. So formally, landuse=forest shouldn't
overlap with other zones, but practically, until a new tag
(landcover=trees) is rendered, this rule isn't going to be followed.

Janko

sri, 25. lis 2017. u 18:41 Martin Koppenhoefer <dieterdreist at gmail.com>
napisao je:

>
>
> sent from a phone
>
> > On 25. Oct 2017, at 17:36, Gaurav Thapa <gthapa.work at gmail.com> wrote:
> >
> > In Nepal we have been trying to make sure that each constructed building
> has its own footprint and is not connected to a neighbouring structure via
> a shared wall. We do this as in reality this is the case as each building
> structure though built next to each other has its own footprint
> (independent foundation).
>
>
> yes, you can find both situations: a single dividing wall used by both
> neighboring buildings (in Europe this occurs mostly with medieval
> buildings), or each building has its own walls (and foundations), but
> without a significant space between them (e.g. 2 cm of insulating material).
>
> I would treat both situations the same and use shared nodes, but maybe
> wouldn’t object if someone purposefully mapped the latter as 2
> almost-touching buildings, although the osm building ways usually describe
> the footprint of the completed building (i.e. with facades, cladding etc.)
> and not the raw load bearing structure.
>
> cheers,
> Martin
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