<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi,</p>
<p>You can cut down you use of several plugins by doing the
following,</p>
<p>1) Create a vector point file with a single point having the
numerical field containing the value 1. This file could be a csv
containing WKT.<br>
</p>
<p>2) Use the vector to raster conversion. (This will take your
vector point file, an create a raster of x,y dimensions. You
point will become 1 and all other values will be 0.</p>
<p>3) Use the Proximity raster distance gdal function.</p>
<p>This requires no plugins so it should be easy to create a
graphical modeler. My favorite way would be to go to strait
Python and to call the gdal proximity function from my Python
script. If you had hundred or thousands of these to do, I could
develop a Python script that could automate the entire thing.
Contact me if you have questions.<br>
</p>
<p>Nicolas Cadieux</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 2021-02-25 12:58 p.m., Fabio Falchi
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1815227708.4326746.1614275927041@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="ydp1f6623d7yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">
<div><br>
</div>
<div dir="ltr" data-setdir="false">
<div>
<div class="ydpf1472d4cmsg-body ydpf1472d4cP_wpofO
ydpf1472d4cmq_AS" data-test-id="message-view-body-content">
<div class="ydpf1472d4cjb_0 ydpf1472d4cX_6MGW
ydpf1472d4cN_6Fd5">
<div>
<div id="ydpf1472d4cyiv3016035406">
<div>
<div
class="ydpf1472d4cyiv3016035406yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica,
Arial, sans-serif;font-size:13px;">
<div dir="ltr">Dear all,</div>
<div dir="ltr"><br>
</div>
<div dir="ltr" data-setdir="false">not having
received any answer, I repeat the request.<br>
</div>
<div dir="ltr">I need to speed up the process of
obtaining rasters with distances from a single
point (or a single lat-lon coordinate) in it.
Manually I use this procedure:</div>
<div dir="ltr">With a georeferenced raster in a
UTM projection I use raster calculator to
obtain a raster with all pixels set to zero.
Then, with Serval plug-in, I manually set to 1
the value of the pixel in the wanted position
(either by using a satellite overlay or by
using a point vector layer with the
appropriate coordinates). Then I use the
proximity function under Raster>Analisys
menu.</div>
<div dir="ltr">I want to make this via the
Graphical Modeler, in order to be able to make
the process fast and skip the manual
introduction with Serval plug-in. At the very
least, I need a mode to put the value 1 in the
pixel of the selected null raster in the
position givel by lat-lon coordinates. <br>
</div>
<div dir="ltr">Thank you!</div>
<div dir="ltr">Best,</div>
<div dir="ltr">Fabio Falchi</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">
<div>
<p
class="ydpf1472d4cyiv3016035406ydp3a68e8daox-fa029a8a82-default-style"><em><span
style="font-size:8pt;">USC -
Universidade de Santiago de Compostela</span></em></p>
<p
class="ydpf1472d4cyiv3016035406ydp3a68e8daox-fa029a8a82-default-style"><em><span
style="font-size:8pt;">ISTIL - Light
Pollution Science and Technology
Institute</span></em></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div><br>
</div>
</div>
</div>
<div id="yahoo_quoted_4660745305" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial,
sans-serif;font-size:13px;color:#26282a;">
<div> Il sabato 20 febbraio 2021, 18:04:14 CET, Fabio Falchi
<a class="moz-txt-link-rfc2396E" href="mailto:fabio_falchi@yahoo.it"><fabio_falchi@yahoo.it></a> ha scritto: </div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id="yiv3016035406">
<div>
<div class="yiv3016035406yahoo-style-wrap"
style="font-family:Helvetica Neue, Helvetica, Arial,
sans-serif;font-size:13px;">
<div dir="ltr">Dear all,</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I need to speed up the process of
obtaining rasters with distances from a single point
in it. Manually I use this procedure:</div>
<div dir="ltr">With a georeferenced raster in a UTM
projection I use raster calculator to obtain a
raster with all pixels set to zero. Then, with
Serval plug-in, I manually set to 1 the value of the
pixel in the wanted position (either by using a
satellite overlay or by using a point vector layer
with the appropriate coordinates). Then I use the
proximity function under Raster>Analisys menu.</div>
<div dir="ltr">I want to make this via the Graphical
Modeler, in order to be able to make the process
fast and skip the manual introduction with Serval
plug-in. At the very least, I need a mode to put the
value 1 in the pixel of the selected null raster in
the position givel by lat-lon coordinates. <br>
</div>
<div dir="ltr">Thank you!</div>
<div dir="ltr">Best,</div>
<div dir="ltr">Fabio Falchi</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">
<div>
<p
class="yiv3016035406ydp3a68e8daox-fa029a8a82-default-style"><em><span
style="font-size:8pt;">USC - Universidade de
Santiago de Compostela</span></em></p>
<p
class="yiv3016035406ydp3a68e8daox-fa029a8a82-default-style"><em><span
style="font-size:8pt;">ISTIL - Light
Pollution Science and Technology Institute</span></em></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Qgis-user mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a>
List info: <a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-user">https://lists.osgeo.org/mailman/listinfo/qgis-user</a>
Unsubscribe: <a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/qgis-user">https://lists.osgeo.org/mailman/listinfo/qgis-user</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Nicolas Cadieux
<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></pre>
</body>
</html>