On 27-Oct-17 12:00 AM, Joseph Reeves wrote:
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
While natural=wood renders, I also tag them as landcover=trees as that
is more truthful of what is there.
So these tree areas get two tags from me until such time as landcover is
rendered then I will remove the natural tag.
On 26 October 2017 at 13:37, Janko Mihelić <jan...@gmail.com
<mailto:jan...@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
<dieterdre...@gmail.com <mailto:dieterdre...@gmail.com>> napisao je:
sent from a phone
> On 25. Oct 2017, at 17:36, Gaurav Thapa
<gthapa.w...@gmail.com <mailto:gthapa.w...@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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