[Qgis-user] Volume calculation - Reg

[Michael Dufty]

Excellent, I hadn’t tried it since 3.16, will try again.
Unfortunately the problem with using interpolation in model builder still seems like it might be difficult to fix.
https://github.com/qgis/QGIS/issues/30029

Michael Dufty

From: Vincent Cloarec <vcloarec at gmail.com>
Sent: Friday, 18 December 2020 9:55 PM
To: Michael Dufty <MDufty at mbsenvironmental.com.au>
Cc: Nicolas Cadieux <njacadieux.gitlab at gmail.com>; Abhi Shek <psn.abhishek at gmail.com>; qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Volume calculation - Reg

TIN interpolation was improved in the 3.16 release. Quite crashes were fixed.
Please, report any issues in github.
Regards.

Vincent.


Le ven. 18 déc. 2020 à 05:29, Michael Dufty <MDufty at mbsenvironmental.com.au<mailto:MDufty at mbsenvironmental.com.au>> a écrit :
The links for Nicolas are quite useful, but I think to create a raster DEM from vector lines you probably need to use the interpolate triangulation with breaklines or structure lines.
The dialogue takes a bit of getting used to, you need to choose the layer the data will come from, click + then in the box below choose whether the layer is being used for points, breaklines or structure lines.

I’ve had major issues with the interpolation crashing QGIS if I try to used it with breaklines for complex imported data, but it seems to work OK for simple test geometries, and may be good for a simple excavation.

I’d be interested to know if anyone has had success with interpolation using breaklines for more complex data, I’ve had to resort to other software trying to import DEM supplied as dxf 3d faces, but maybe I’m missing a basic step like fixing geometry or removing duplicates.

From: Qgis-user <qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org>> On Behalf Of Nicolas Cadieux
Sent: Friday, 18 December 2020 12:04 AM
To: Abhi Shek <psn.abhishek at gmail.com<mailto:psn.abhishek at gmail.com>>
Cc: qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Volume calculation - Reg

This should help

https://youtu.be/EerXfUf-aHo

https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/
Nicolas Cadieux
https://gitlab.com/njacadieux

Le 17 déc. 2020 à 04:57, Abhi Shek <psn.abhishek at gmail.com<mailto:psn.abhishek at gmail.com>> a écrit :

Sir,
I invite your kind attention to the above subject. I am a beginner in qgis.
I want to create a raster DEM using Vector Lines.
In a nutshell, I want to calculate the planned excavated volume.
please guide me in this matter.

--
with warm regards,
P S N Abhishek,
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