Hi Mike:
I usually convert the contours or breaklines into a point layer and then
generate a dem from that. This is not a precise methodology but it
would depend on what you are trying to do and the precision of the
underlying data.
Kirk Schmidt
On 12/18/2020 5:28 AM, Michael Dufty wrote:
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-boun...@lists.osgeo.org> *On Behalf Of
*Nicolas Cadieux
*Sent:* Friday, 18 December 2020 12:04 AM
*To:* Abhi Shek <psn.abhis...@gmail.com>
*Cc:* qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] Volume calculation - Reg
This should help
https://youtu.be/EerXfUf-aHo <https://youtu.be/EerXfUf-aHo>
https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/
<https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/>
Nicolas Cadieux
https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>
Le 17 déc. 2020 à 04:57, Abhi Shek <psn.abhis...@gmail.com
<mailto:psn.abhis...@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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--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: k...@nortekresources.com
Web: www.nortekresources.com
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