<div dir="ltr">@Dave F <br><br>Here is an example of where idependent buildings have been built as connected in OSM (<a href="https://osm.org/go/zrViz5k4A--?layers=D&m=" target="_blank">https://osm.org/go/zrViz5k4A-<wbr>-?layers=D&m=</a>). Here is an area where we have a great difficulty tracing using satellite imagery alone and where mapping historically has not been clear regarding this rule (<a href="http://osm.org/go/zrWcyA9Wb?m=">http://osm.org/go/zrWcyA9Wb?m=</a>). <br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Oct 25, 2017 at 9:52 PM, Dave F <span dir="ltr"><<a href="mailto:davefoxfac63@btinternet.com" target="_blank">davefoxfac63@btinternet.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Could you link to an example?<br>
<br>
DaveF<div><div class="h5"><br>
<br>
<div class="m_-5115046008826388596moz-cite-prefix">On 25/10/2017 16:36, Gaurav Thapa
wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">
<div dir="ltr">
<div class="gmail_extra" style="font-size:12.8px">"2.
Buildings.</div>
<div class="gmail_extra" style="font-size:12.8px">If 2
buildings share a wall or are constructed one aside the
other (double wall), you should have them connected in OSM
as well."</div>
<div class="gmail_extra" style="font-size:12.8px"><br>
</div>
<div class="gmail_extra" style="font-size:12.8px">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).
We have changed many buildings that have been drawn as
suggested by you Martin (previously traced by remote mappers
especially in highway towns of Nepal). </div>
<div class="gmail_extra" style="font-size:12.8px"><br>
</div>
<div class="gmail_extra" style="font-size:12.8px" dir="auto">So,
there if there is a set of rules it would help us as well.</div>
<div class="gmail_extra" style="font-size:12.8px" dir="auto"><br>
</div>
<div class="gmail_extra" style="font-size:12.8px" dir="auto">Regards</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Oct 25, 2017 at 4:48 PM, Martin
Koppenhoefer <span dir="ltr"><<a href="mailto:dieterdreist@gmail.com" target="_blank">dieterdreist@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div>
<div>
<div>
<div>
<div><span>
<div class="gmail_extra">
<div class="gmail_quote">2017-10-25 11:50
GMT+02:00 Tomas Straupis <span dir="ltr"><<a href="mailto:tomasstraupis@gmail.com" target="_blank">tomasstraupis@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello<br>
<br>
For a long time I wanted to hear
opinion on the topic of topology rules.<br>
<br>
By "topology rules" here I mean just
simple rules such as:<br>
* polygon X should not overlap polygon
Y<br>
* polygon X should always be above
polygon Y<br>
* point X should be not further from
line Y than D<br>
etc.<br>
</blockquote>
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</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra"><br>
</div>
</span>
<div class="gmail_extra">most important is IMHO:
when do you share nodes, and when not. <br>
</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">1. E.g. political
boundaries usually should reuse the same
border ways (=no gap between entities).</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Other examples:</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">2. Buildings.</div>
<div class="gmail_extra">If 2 buildings share a
wall or are constructed one aside the other
(double wall), you should have them connected
in OSM as well.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">If a square is
delimited by buildings, the place=square
object should share ways with the buildings.</div>
<div class="gmail_extra">etc.</div>
<br>
Some mappers tend to map these things very close
but distinct, which IMHO is a topology error.<br>
</div>
The rule I want to see: map in a way that it
represents reality nicely.<br>
<br>
</div>
3. Roads and areas:<br>
</div>
Some mappers connect "incompatible" object types
(centre lines of roads and areas). The areas should
end at their border and not be extended.<br>
<br>
</div>
Cheers,<br>
</div>
Martin<br>
</div>
<br>
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<div>Gaurav Thapa<br>
</div>
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Secondary Cities Pokhara Project<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div>Gaurav Thapa<br></div>Project Manager<br>Secondary Cities Pokhara Project<br></div>Kathmandu Living Labs<br></div></div>
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