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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Hi Andreas (and others who have answered our questions), “Zonal Statistics” do not exactly do the job, it also do the next step in our task!
</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">In fact our intentions was to select the surface heights (measured from a flight with laser in a 1,6mx1,6m grid) only inside the buildings polygons
and then export the roof heights (still in a 1,6mx1,6m grid ) to a another program. In this program the mean heights of all buildings should be calculated and attached to the buildings.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Now we can use “Zonal Statistics” (and only select the mean-calculation) and then we have the mean height as a new feature value for each building.
Perfect!</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">We did tried the “Zonal Statistics” earlier but couldn’t comprehend were the calculated values ends (there was a cryptic “Band”-drop down in
“Zonal Statistics” form). </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">I still don’t understand the “Band”-drop down, but so what, it works.</span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Thank you very much.</span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Qgis-user [mailto:qgis-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Neumann, Andreas<br>
<b>Sent:</b> 10. marts 2016 17:46<br>
<b>To:</b> Richard McDonnell<br>
<b>Cc:</b> qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Select heights from a raster layer</span></p>
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<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">Hi,</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">Have you tried the "Zonal Statistics plugin"?</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">After enabling this plugin, you can find it in the raster menu - or maybe it is already there by default.</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">It calculates count, sum, min, max, mean at the intersection of a polygon layer (e.g. your polygon layer with building footprints) and a given raster layer (your grid based terrain model).</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">I think it does what you want.</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">Hope this helps,</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">Andreas</span></p>
<p><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">On 2016-03-10 17:37, Richard McDonnell wrote:</span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">Claus,<br>
It may not be exactly what you want, but one suggestion would be to derive the centroids from the building polygons (making sure there within the polygon) and then use the point sampling tool to pull the elevations from your DSM. of course that will not guarantee
that you get the max height<br>
If you can, it may be best to go back to the DSM source, the raw data used to derive the DSM. If it is, for instance a point cloud dataset, like that from Lidar, you could select all points within your polygons, then extract only the points at the apex (first
returns), just a thought. <br>
Regards,<br>
<br>
Richard</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Verdana","sans-serif"">On 10/03/2016 11:52, Claus Backalarz wrote:</span></p>
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<p class="MsoNormal" style="">Hi, we are novices in the QIS-world so bear with misunderstandings and
<span class="hps">misconceptions.</span></p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">We have a raster layer with surface heights called DSM_611_86. Originally it is was a plain text file with a header describing number of rows and columns, geographically lower left corner etc. Data was the surface heights in 6250
rows and 6250 columns. The file was imported without problems with "Add raster layer" in QGIS. It is beautiful showed in QGIS2.14 Essen on Windows 7. So far no problem.</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">But we want with (a lot) of polygons representing buildings to select all surface heights inside this polygons. The selected heights should afterward be saved as a reduced raster layer or, even better, as a shape file of points
with an attribute for the heights. In other words as a layer of points with one and only one attribute, the surface height.</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">We have tried the plug-in "Point Sampling Tools" and some other hints from QGIS home pages, but I seems that select and save heights in the described way is "out of scope".</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">Do anybody have a useful way out of this problem ?</p>
<p class="MsoNormal" style=""> </p>
<p class="MsoNormal" style="">Best regards</p>
<p class="MsoNormal" style="">Claus B</p>
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