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Hi,<br>
<br>
Have you tried the interpolation plugin in QGis?
(raster/interpolation/interpolation) if the plugin is activated. I
see the option is available for points, structure lines and break
lines.... It seems to work if you have a z field. If you are using
a tach or a total station, you will probably not have too many
points for this plugin.<br>
<br>
Nicolas<br>
<br>
<div class="moz-cite-prefix">Le 2015-11-20 09:40, Neumann, Andreas a
écrit :<br>
</div>
<blockquote cite="mid:8ac188e15f8702637f3737782a4a302e@carto.net"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p>Hi,</p>
<p>No - the points are manually surveyed - field work - very
precise surveys with Tachymeter. It is in developed areas where
walls outside of buildings are quite frequent.</p>
<p>We also have LIDAR data (quite dense from last year) - but they
are not precise enough for certain projects that require
accuracies at plus/minus 5cm and contour line intervals at 20-30
cm.</p>
<p>I will try converting the break lines into dense points - to
reach a similar effect than normal break lines.</p>
<p>Andreas</p>
<p>On 2015-11-20 14:57, Nicolas Cadieux wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left:
#1010ff 2px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ignored -->
<p dir="ltr">Hi again,</p>
<p dir="ltr">Are the irregular points LIDAR? If it is comparable
in point density, you could do two interpolations. One for the
ground that could use a larger interpolation search window and
then one for the objects that are above the ground with a very
small search window (like 1m). After that, you could make a
normalized DEM and then you can add the walls to the ground
model.. That would give you sharp walls feature on a smooth
ground DEM. </p>
<p dir="ltr">The PDAL library or Cloud Compare could separate
buildings from the ground.</p>
<p dir="ltr">Good luck!</p>
<p dir="ltr">Nicolas Cadieux M.Sc.<br>
Les Entreprises Archéotec inc. <br>
8548, rue Saint-Denis Montréal H2P 2H2<br>
Téléphone: 514.381.5112 Fax: 514.381.4995<br>
<a class="moz-txt-link-abbreviated" href="http://www.archeotec.ca">www.archeotec.ca</a></p>
<div class="gmail_quote">On Nov 20, 2015 5:47 AM, "Neumann,
Andreas [via OSGeo.org] " <<a moz-do-not-send="true">[hidden
email]</a>> wrote:<br>
<blockquote class="quote" style="border-left: 2px solid
#CCCCCC; padding: 0 1em;">
<p>Hi,</p>
<p>At my workplace we have to generate terrain models
(contour lines) from irregularly input points with
heights. We also have break lines (e.g. walls) that we
would like to take into account during interpolation.</p>
<p>While there are quite a few interpolation available in
GRASS or SAGA, I can't find any interpolation methods that
also take break lines.</p>
<p>I found <a moz-do-not-send="true"
href="http://grasswiki.osgeo.org/wiki/TIN_with_breaklines">http://grasswiki.osgeo.org/wiki/TIN_with_breaklines</a>
- which seems to do what I want, but is a separate module
and builds on a "triangle" executable and is not
distributed with GRASS.</p>
<p>I have therefore two questions:</p>
<p>1. Is this the only FOSSGIS option we have, if breaklines
should be considerered during interpolation? Or are there
alternatives?</p>
<p>2. Did someone use v.traingle. this in a production
environment? Does it work properly? I am just asking
before I try to install it.</p>
<p>3. If this works fine - can we try to distribute it with
OSGeo4W?</p>
<p>Thanks,</p>
<p>Andreas</p>
<div> </div>
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