Hi,
You can cut down you use of several plugins by doing the following,
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.
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.
3) Use the Proximity raster distance gdal function.
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.
Nicolas Cadieux
On 2021-02-25 12:58 p.m., Fabio Falchi wrote:
Dear all,
not having received any answer, I repeat the request.
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:
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.
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.
Thank you!
Best,
Fabio Falchi
/USC - Universidade de Santiago de Compostela/
/ISTIL - Light Pollution Science and Technology Institute/
Il sabato 20 febbraio 2021, 18:04:14 CET, Fabio Falchi
<[email protected]> ha scritto:
Dear all,
I need to speed up the process of obtaining rasters with distances
from a single point in it. Manually I use this procedure:
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.
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.
Thank you!
Best,
Fabio Falchi
/USC - Universidade de Santiago de Compostela/
/ISTIL - Light Pollution Science and Technology Institute/
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Nicolas Cadieux
https://gitlab.com/njacadieux
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