[Qgis-user] Point layer output from modeller point parameter

[Philip Barlow]

Thanks Nyall,

This isn't mission critical work or anything. What I am experimenting with here, taking advantage of the fact that in QGIS 3.x you can point algs in the modeller at data outside your project, is creating a set of ready to use analysis tools for our users.

Is it worth putting a feature request in for something like this?

I don't know C++ but I've got the python basics and use the console in QGIS from time to time, it's a skill I want to develop given time. I'll have a look at the template.


Phil 


-----Original Message-----
From: Nyall Dawson [mailto:nyall.dawson at gmail.com] 
Sent: 21 August 2018 23:18
To: Philip Barlow
Cc: qgis-user
Subject: Re: [Qgis-user] Point layer output from modeller point parameter

On Tue, 21 Aug 2018 at 23:15, Philip Barlow
<philipb at pembrokeshirecoast.org.uk> wrote:
>
> Hi folks,
>
>
>
> Is there a way to create a point layer as an output from the point parameter in the modeller? For example if you wanted to record the click location as well as generate e.g. a viewshed or water outlet.
>
>
>
> I’ve had a bit of a trawl through the tools, not found anything that fits the bill yet.
>
>

Unfortunately not (at least, not out of the box). There's an algorithm
which converts an extent parameter to a vector layer, but the
equivalent doesn't exist (yet) for point parameters.

The source for "extent to layer" is at
https://github.com/qgis/QGIS/blob/master/src/analysis/processing/qgsalgorithmextenttolayer.cpp,
if you know c++ and feel like adding a point version. Otherwise, you
could use a similar approach and create a python script algorithm
using the script template to do this task.

Nyall

Mae'r Awdurdod yn hapus i gyfathrebu yn Gymraeg neu yn Saesneg

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