Sorry for the spam, but I've just found what I was looking for at:
https://gis.stackexchange.com/questions/327861/writing-comments-in-qgis-graphical-modeler
Davide Di Mauro | Alluvium Consulting Australia
GIS Specialist & Flood Modeller
M 0422 634 107
E
Hi all,
My aim is to being able to run a graphic model which has the help section on
the right hand side of the interface, similar to every core algorithms.
This way should allow the users to read the instructions from the interface,
rather than having to open the graphic model in editing mode
On 5/2/22 9:36 PM, Stephen Sacks via Qgis-user wrote:
I would like to terminate a Python script gracefully. Both quit() and
exit() not only abort the script but end the entire QGIS app.
Assuming the script runs as a QGIS plugin, a better alternative is to
raise an exception, which will be
Put your code in a main() function and use return to leave the function?
On 02-05-2022 18:06, Stephen Sacks via Qgis-user wrote:
I would like to terminate a Python script gracefully. Both quit() and
exit() not only abort the script but end the entire QGIS app. For
example, if a file I want
I would like to terminate a Python script gracefully. Both quit() and
exit() not only abort the script but end the entire QGIS app. For
example, if a file I want to read doesn't exist, the following four
lines of code terminate QGIS:
filePath = Path(fName)
if not filePath.is_file():
is-user
> Subject: [Qgis-user] Classify road network into dead-end links and
> links connected on both ends
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While I agree that Shapefiles are often not ideal, GeoPackage or any
other fancy modern format would have the same issues. They have
implicite topology (the spatial relationships of the geometries defines
what is connected and what is not), not explicite topology.
You should find tools to do
Hi,
Go to https://plugins.qgis.org/models/?order_by=-upload_date&_gallery=true
and download the 3 “fix directional networks” model. I created this to
troubleshoot river network file for people that needed perfectly connected
network or graph files. This video should help also
Hi Roland,
You could either go making SQL queries (using st_startpoint() and
st_endpoint() et cetera) or have a look at the "Networks" plugin which
has a lot of this kind of functionality.
https://plugins.qgis.org/plugins/networks/
And there are several other network and topology related
that's why SHP files need to die: They're too simple to use, so also get
used by people less "in the know"
On 2022-05-02 11:05, Roland Spielhofer wrote:
I totally agree with you, but the shape is all I got from the client -
nothing better is available at his side...
*Gesendet:* Montag, 02.
I totally agree with you, but the shape is all I got from the client - nothing better is available at his side...
Gesendet: Montag, 02. Mai 2022 um 10:49 Uhr
Von: "Zoltan via Qgis-user"
An: qgis-user@lists.osgeo.org
Betreff: Re: [Qgis-user] Classify road network into dead-end links and
On a more helpful note, you could add 2 columns to your line-string
attribute table and then iterate through the start and end coords of
each line, counting the number of lines selected at their endpoints.
HTH,
Zoltan
On 2022-05-02 10:49, Zoltan via Qgis-user wrote:
Sigh, this is where
Sigh, this is where SHP-file hell comes in - it's the scourge of GIS.
Wouldn't it have been nice if your road network was in a data structure
that allows you to go to each point and ask it "how many lines emanate
from me"?
Sorry, I know this is not helpful to you, but the SHP file format
Hi,
I have a road network (Shape linestring) where I would like to classify all links that are dead-end and compute the share of the dead-end links in relation to the total network length.
I am pretty sure this is possible in QGIS or a plugin - any pointers would be appreciated.
Regards,
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