On 2015-02-04 18:55, Genevieve Faille wrote:
Dear users,
I am a new Qgis user, so maybe my question will seems quite easy for you and I
speak french so i'll try my best!
I want to clean a polygone shp (overlaps, gaps etc.) by using topology checker
and the v.clean from Grass.
I dowloaded Qgis yesterday (2.6.1) and when I try to use the v.clean (in
processing/commander)I get this message:
Missing dependency.This algorithm cannot be run :-(
This algorithm requires GRASS GIS 7 to be run. Unfortunately, it seems that
GRASS GIS 7 is not installed in your system, or it is not correctly configured
to be used from QGIS
Click here
<http://docs.qgis.org/2.0/en/docs/user_manual/processing/3rdParty.html>to know
more about how to install and configure GRASS GIS 7 to be used with QGIS
The commander only seems to find the Grass 7 version.
If you do not have to run this through the commander,
you could try to run the 6.4 version of v.clean in the
Processing toolbox. (Processing-> Toolbox).
The Grass version that was install automaticly with Qgis is the Grass 6.4.3.
So I found the Grass 7 version and downloaded it. But now my problem is how to
set the good path to the good Grass??
In the user manual in the section *"Configuring external
applications*<http://docs.qgis.org/2.6/es/docs/user_manual/processing/3rdParty.html#configuring-external-applications>*",
*i can read:** "Configuring GRASS is not much different from configuring SAGA. First, the path to the GRASS
folder has to be defined, but only if you are running Windows.".........."Also, if you want to use a
different GRASS installation, you can change that setting and point to the folder where the other version is
installed. "
Ok ! But how do i do that... so I red the SAGA part:
"If you have installed SAGA yourself (remember, you need version 2.1), the path to
the SAGA executable must be configured. To do this, open the configuration dialog. In the
/SAGA/ block, you will find a setting named/SAGA Folder/. Enter the path to the folder
where SAGA is installed. Close the configuration dialog, and now you are ready to run
SAGA algorithms from QGIS."
I didn't find the configuration dialog or any "block"....So how can I change
the path for Grass and use the v.clean?
Go to Processing-> Options and configuration.
In Providers you will find "GRASS GIS 7 commands" with
the different configuration options.
Håvard
thanks
Genevieve Faille
Québec
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--
Håvard Tveite
Department of Mathematical Sciences and Technology, NMBU
Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY
Phone: +47 64965483 Fax: +47 64965401 http://www.nmbu.no/imt/
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