# volume mass calculation

I have raw data with x, y, z coordinates before work and after work. I have to calculate mass volume between two of them. I have converted two files into tin. I have used surface difference (3D Analyst) tool in Arcscene. Output file contain column Volume in m3. Is this correct steps of calculation ?

• mass = density * volume Commented Oct 3, 2016 at 20:19

Yes, these are the fundamental steps to achieve your goal.

The outputs according to ESRI can be read as;

Volume—The volume of space between the input and reference surface that is bounded by the polygon. Volume will always be 0 for areas where the two surfaces are the same.

SArea—The surface area of the input surface that is bounded by the polygon.

Code—A numeric value that describes the spatial relationship of the surface to the reference plane. -1 indicates the surface is below the reference plane, 0 indicates the surface is the same as the reference plane, and 1 indicates the surface is above the reference plane.

Ensure you data is projected. Ensure your x,y,z units and projection are all use the same base-level unit (say meters).

Before and after does not matter so much as all you will get is inverted numbers so just switch the sign. Technically you have before and after the wrong way around as I assume before is your reference layer. It is all in the ArcGIS help link.

in_surface = The terrain or TIN surface whose relative displacement is being evaluated from the reference surface.

in_reference_surface = The terrain or TIN surface that will be used as the baseline for determining the relative displacement of the input surface.

• Is there any tool/soft where I can verify this result ? I'm not sure that this is correct. Commented Oct 3, 2016 at 20:39
• @Falcom I usually just simplify the problem and do it on a piece of paper and typically get within a few percent. Commented Oct 3, 2016 at 20:40
• @falcon why are you not sure? You need to give us more. Please list the x,y,z units and the projection parameters. You may have an issue due to this as it is common. Without this information I doubt you'll get more help. Commented Oct 3, 2016 at 21:50
• Ok, please let me know what is the volume mass basing on file which is under below link where you can find tin before and tin after with as well .prj file. Then we will compare results. Download link: we.tl/3MpnY4HC7p Commented Oct 4, 2016 at 11:56
• have you had time to verify this ? Commented Oct 4, 2016 at 19:38