[GRASS-user] r.grow.distance can't create meters instead of map units

[Dimitris sal]

Hello
In order to fix it I had to enable the GRASS plugin (is already installed)
then import the raster , and run the plugin's r.grow.distance with geodesic
and it worked.

I just tried this and it worked Thanks for your help!!!

As a local workaround, you can simply search for r.grow.distance.txt
on your computer and add the missing "geodesic" there.
(and open an issue with the QGIS project or open a pull request with
the change there, or someone else does that).


Kind regards
Dimitris

Στις Παρ, 2 Αυγ 2019 στις 12:53 μ.μ., ο/η Markus Neteler <neteler at osgeo.org>
έγραψε:

> Hi Dimitris,
>
> On Fri, Aug 2, 2019 at 8:58 AM Dimitris sal <jimmaras123 at gmail.com> wrote:
> >
> > Hello everyone
> >
> > My first post in this list,
> >
> > So i am trying to create a raster with r.grow.distance.
>
> As you are working via QGIS, in which projection do you work?
>
> > If i use the normal options everything works like the proximity analysis
> of QGIS, but when I try to add the advanced parameter Output distances in
> meters instead of map units i get the error "ERROR: Output distance in
> meters for lat/lon is only possible with 'metric=geodesic'"
> >
> > How do i add in the metrics the geodesic? I only have 4
> euclidean,manhattan,squared,maximum.
>
> Yes, this is a limitation in QGIS processing (for whatever reason).
> The parameters made available to the QGIS users are often a subset of
> those provided by GRASS GIS.
>
> # QGIS processing
> grep Metric
> /usr/share/qgis/python/plugins/processing/algs/grass7/description/r.grow.distance.txt
>
> QgsProcessingParameterEnum|metric|Metric|euclidean;squared;maximum;manhattan|False|0|True
>
> # GRASS GIS
> r.grow.distance --help
> ...
>    metric   Metric
>              options: euclidean,squared,maximum,manhattan,geodesic
>              default: euclidean
>
> The change would be needed here:
>
> https://github.com/qgis/QGIS/blob/release-3_8/python/plugins/processing/algs/grass7/description/r.grow.distance.txt
>
> > Is there any alternative to create the raster in meters instead of map
> units?
>
> As a local workaround, you can simply search for r.grow.distance.txt
> on your computer and add the missing "geodesic" there.
> (and open an issue with the QGIS project or open a pull request with
> the change there, or someone else does that).
>
> Best,
> Markus
>
> --
> Markus Neteler, PhD
> https://www.mundialis.de - free data with free software
> https://grass.osgeo.org
> https://courses.neteler.org/blog
>
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