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How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 9:29 am
by andre
So I have a .las file, it contains some areas with piles of gravel.
I would like to know the volume of the piles.
I do know how to compare more then one las, but this time I need to somehow specify a "level" surface under the pile, then compare the pile to that.
I have read:
http://www.cloudcompare.org/doc/wiki/in ... .5D_Volume
it mentions compare with "and an arbitrary plane (constant height)" - but there are no instructions for that..
Thank you.
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 11:04 am
by daniel
You just have to start the tool with one cloud highlighted. And then in the tool you can specify a 'constant height' for the ground (you can input its height in a dedicated field).
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 11:18 am
by andre
If I select only one pointcloud, then use tools,volume, compute 2.5D volume I get "Error: Select tow point clouds!"
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 11:31 am
by andre
ok, so I could cut and clone an area.
Since the surface of the stockpile area is sloping, it would be best to compare the pile to a flat area generated by the elevation of the surrounding polygon, is that possible ?
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 12:24 pm
by daniel
Which version are you using? It reminds me of a bug. Can you try with the latest 2.10.alpha version?
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 12:39 pm
by andre
using 2.9.1 distributed as a snap.
I could try but it was trivial to workaround the message, using Constant wont work well on sloping area.
Right now, I have cut out the area of interest, and cloned it, now I need to find a way to smooth it out to be just flat between the polygon edges, or otherwise make it a flat, sloping surface.
Do you have any clues for me ? :)
Re: How to Calculate stockpile volume
Posted: Tue Jan 02, 2018 2:01 pm
by daniel
Well you could segment only some points all around the area edges, and then use the Delaunay triangulation to 'interpolate' the surface inside (Tools > Mesh > 2.5D triangulation'). Eventually you can sample points on the generated surface patch.
Re: How to Calculate stockpile volume
Posted: Wed Jan 03, 2018 9:13 am
by andre
Sounds good, except I don't see 'Mesh > 2.5D triangulation'
I tried
"Edit"->"Mesh"->"Delumay 2.5D XY Plane"
then
"Edit"->"Mesh"->"Sample Points"
seems to work great, thank you.
Re: How to Calculate stockpile volume
Posted: Mon Jul 09, 2018 11:25 am
by maarten
Hi,
I can verify that computing the volume w.r.t. a ground plane with constant height does not work in v2.9.1 (error message telling you to select 2 point clouds), while it does work in 2.10alpha
cheers,
Maarten