<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi Sebastian,</p>
<p>thanx, that worked.</p>
<p>But somehow, the hole process feels a bit clumsy.</p>
<p>Having to fumble together a classification with "thru" (juck!),
then the toolbox reclassify just seems to be broken, gladly gdal
calculator does ...</p>
<p>Why isn't there some "raster SQL" that saves one from all these
stupid single steps?</p>
<p>Ok, will then try to build a model and hope it will work for the
tests to come…</p>
<p>Thanks a lot,</p>
<p>Bernd<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Am 17.02.22 um 22:19 schrieb Sebastian
Gutwein:<br>
</div>
<blockquote type="cite"
cite="mid:CAED_52rSiS-1kzp-kzeQ6tUc=T+gUj6hPEPdo6iOmWw-xLnehw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Reclassify your Layer 1 to be anything greater than
1 = 0 everything else equals 1. This will give you a binary 1
and 0 raster (Layer 3) that you can use in the raster
calculator: Layer 2 * Layer 3. Anywhere where layer 3 is 1 your
layer 2 values will stay the same and anywhere where layer 3 is
0 your layer 2 values will become 0. <br>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Feb 17, 2022 at 3:19
PM Bernd Vogelgesang <<a
href="mailto:bernd.vogelgesang@gmx.de"
moz-do-not-send="true" class="moz-txt-link-freetext">bernd.vogelgesang@gmx.de</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hi folk,</p>
<p>I hardly never work with raster calculations, and
unfortunately there is nowhere a collection of syntax
examples for different use cases to be found
(documentation :( ).</p>
<p>Anything apart from +-*/ is beyond my scope.</p>
<p>So,</p>
<p>I made a viewshed analysis over a digital surface model
(try the awesome Visibility Analysis plugin form Zoran
Čučković and buy him a beer!)</p>
<p>A lot of "views" are caught by tree canopy, but I am only
interest in the flat grounds.</p>
<p>So I substracted the surface model layer from the ground
model layer, and this is Layer 1. <br>
</p>
<p>Giving a threshold of 1 meters difference for
inaccuracities, all pixels in this layer above 1 should
result in 0 (zero) in my viewshed raster (Layer 2)</p>
<p>Please give me some hints,</p>
<p>Cheers,</p>
<p>Bernd<br>
</p>
<p><br>
</p>
</div>
_______________________________________________<br>
Qgis-user mailing list<br>
<a href="mailto:Qgis-user@lists.osgeo.org" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">Qgis-user@lists.osgeo.org</a><br>
List info: <a
href="https://lists.osgeo.org/mailman/listinfo/qgis-user"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://lists.osgeo.org/mailman/listinfo/qgis-user</a><br>
Unsubscribe: <a
href="https://lists.osgeo.org/mailman/listinfo/qgis-user"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://lists.osgeo.org/mailman/listinfo/qgis-user</a><br>
</blockquote>
</div>
</blockquote>
</body>
</html>