[OSM-talk] Topology rules

[Joseph Reeves]

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.


Getting off topic, I think you want natural=wood :

http://wiki.openstreetmap.org/wiki/Tag:natural%3Dwood

On 26 October 2017 at 13:37, Janko Mihelić <janjko at gmail.com> wrote:

> 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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