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Hi, Christof!<br>
<br>
I didn't practice 3D for a while and I'm not a geek either.<br>
<br>
QGIS does not explicitely treat vectorial 3D information, but some
(many?) tools treat the vectors without losing Z values. <br>
Besides, QGIS evolves so fast that it is difficult to keep track of
the way it handles z information.<br>
<br>
If I remember rightly (probably QGIS 2.x at that time), for those 3D
compatible tools, lines are not treated on a per vertex basis but
with one z value for the whole line, keeping just the z value of one
of the vertices I suppose.<br>
<br>
To get the mean value for line made of vertices with different z
values, I would try this : <br>
- decomposing (in Grass I suppose) the line in points with the z
value in one attribute field and a line identifier in another
field;<br>
- calculating the mean z value in association with the line
identifier;<br>
- recomposing the line with the help of the line identifier.<br>
<br>
<br>
Hope this helps, <br>
<br>
<pre class="moz-signature" cols="72">Paul
</pre>
<div class="moz-cite-prefix">Le 27/05/2015 16:19, Christof Kammerer
a écrit :<br>
</div>
<blockquote
cite="mid:BLUPR01MB0654F0ED3C51C5313717043A6CB0@BLUPR01MB065.prod.exchangelabs.com"
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<p>Hi!</p>
<p>I have a 3d shp-file containing building outlines. What I
need is an attribute field with the value of the average
altitude of the outline of every single building.<br>
</p>
<p>Is that possible with qgis/grass gis plugin? If not which
other tools exist to get this result?<br>
</p>
<p><br>
</p>
<p>Sincerely, Christof<br>
</p>
</div>
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