Measuring volume between specific elevation help

[Apavlicek]

Is it possible to measure volume between two specific elevations from a drone survey of a open pit mine. For example it the pit is 100 ft deep and I want to measure the volume between 100ft and 50ft deep. Is this possible?

[dpitman]

It should be. The area to be calculated is determined by a polygon and you can place the polygon wherever you wish.
You can specify the elevation of the polygon.

[Paulo]

Yes it can.

You could just digitize a polygon around your open pit. Supposing the surrounding polygon is pit then difference in volume between level 100 ft and 50 ft would be (supposing elevation units are feet):

Code: [Select]

pit.volume(level=100)['below'] - pit.volume(level=50)['below']
1st example shows volume of pile between levels 335 m and 345 m. Since it is a pile I use 'above' instead of 'below'...53760.9 m3

2nd example show volume between levels 131 m and 128 m for a quarry pit 2879.13 m3

[Apavlicek]

Do you have to manually dry the polygon around each elevation, or are you able to just enter each elevation your trying to select.

[dpitman]

You would need to draw the polygon to define the extents of your calculation area.

[Paulo]

Hello,

actually when you are using a custom level e.g. pit.volume(level=50)[below] then the surface will be defined by the intersection of horizontal plane z=50 and the 3d model. So the delimitation pit just has to surround the pit....

[Apavlicek]

How or where do you specify the two different elevations that you are trying to measure between?

[Paulo]

Apavlicek,
In previous post I showed how to calculate volume between 2 elevations (in this case 50 and 100) for a given open pit whre pit is the Polygon shape pit surrounding  limit...

Yes it can.

You could just digitize a polygon around your open pit. Supposing the surrounding polygon is pit then difference in volume between level 100 ft and 50 ft would be (supposing elevation units are feet):

Code: [Select]

pit.volume(level=100)['below'] - pit.volume(level=50)['below']
1st example shows volume of pile between levels 335 m and 345 m. Since it is a pile I use 'above' instead of 'below'...53760.9 m3

2nd example show volume between levels 131 m and 128 m for a quarry pit 2879.13 m3

[dpitman]

How or where do you specify the two different elevations that you are trying to measure between?

A) You draw a polygon.

B) I think what Paul is describing is selecting ANY POINT on the surface that lies at  "elevation A"  and below and subtracting all the surface that is "elevation B" from that. This will work if you want to find the volume difference between those values everywhere.

Typically, your surface will be larger than the area where you want calculations.  In that case, you use polygons.  You understand defining the area with a polygon is generally very easy?

[Apavlicek]

Oh ok. I thought there was a way to just enter the elevation versus drawing the polygon manually.