Stockpiles can overlap, making the base line drawing difficult. The Interpolate Z feature available in the Edit Vertex mode of the SELECTION TOOLS helps you to lower boundaries under overlapping stockpile areas. As a result, you will create a better reference surface to calculate the stockpile volume calculation.


  1. Draw and select the stockpile boundary.
  2. Select the TOOLS tab
  3. Enable Edit Vertex.
  4. Interpolate the boundary where needed.

Stockpile boundary

Use the drawing tools available in the HOME tab to draw the boundary around the stockpile. In the area where stockpiles overlap, draw the boundary on the intersection where the two piles meet.

Lower part of the base line

Select the stockpile boundary to access the TOOLS tab. Enable Edit Vertex feature and set Interpolate Z as Edit Vertex Mode. Click on the first vertex of the section to bury (before the intersection) and then on the last vertex of this section (after the intersection). The range of vertices Z elevation will be interpolated from these 2 points,  and the section of the polyline will be lowered under the stockpile to the assumed ground level. 

The boundary can now be used to create a more precise reference surface for volume calculation.