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On 27-Oct-17 12:00 AM, Joseph Reeves wrote:<br>
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<div><span style="font-size:12.8px">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.</span></div>
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<div>Getting off topic, I think you want natural=wood :</div>
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<a href="http://wiki.openstreetmap.org/wiki/Tag:natural%3Dwood"
moz-do-not-send="true">http://wiki.openstreetmap.org/wiki/Tag:natural%3Dwood</a><br>
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While natural=wood renders, I also tag them as landcover=trees as
that is more truthful of what is there. <br>
So these tree areas get two tags from me until such time as
landcover is rendered then I will remove the natural tag. <br>
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<div class="gmail_quote">On 26 October 2017 at 13:37, Janko
Mihelić <span dir="ltr"><<a href="mailto:janjko@gmail.com"
target="_blank" moz-do-not-send="true">janjko@gmail.com</a>></span>
wrote:<br>
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<div>I like the idea of formalizing OSM topology!<br>
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An example: power lines should share nodes with
nothing except power towers, portals and buildings
(substation buildings).<br>
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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.<span class="HOEnZb"><font
color="#888888"><br>
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<span class="HOEnZb"><font color="#888888">Janko<br>
</font></span></div>
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<div dir="ltr">sri, 25. lis 2017. u 18:41 Martin
Koppenhoefer <<a
href="mailto:dieterdreist@gmail.com"
target="_blank" moz-do-not-send="true">dieterdreist@gmail.com</a>>
napisao je:<br>
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<br>
sent from a phone<br>
<br>
> On 25. Oct 2017, at 17:36, Gaurav Thapa <<a
href="mailto:gthapa.work@gmail.com"
target="_blank" moz-do-not-send="true">gthapa.work@gmail.com</a>>
wrote:<br>
><br>
> 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).<br>
<br>
<br>
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).<br>
<br>
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.<br>
<br>
cheers,<br>
Martin<br>
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