How to Calculate stockpile volume

[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.

[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).

[andre]

If I select only one pointcloud, then use tools,volume, compute 2.5D volume I get "Error: Select tow point clouds!"

[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 ?

[daniel]

Which version are you using? It reminds me of a bug. Can you try with the latest 2.10.alpha version?

[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 ? :)

[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.

[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.

[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