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How can I calculate the volume or area between contours in Surfer?

You can calculate the volume or area between contours either manually or by using a script to automate the process in Surfer.
 
Manually
  1. Click Grids| Calculate | Volume.
  2. In the Grid Volume dialog, click Browse.
  3. In the Open Grid dialog, select your grid file and click Open.
  4. Set the grid file as the Upper Surface| Grid File and the Z level of the first contour as the Lower Surface (Constant Z = ).
  5. Click OK.
  6. Record the Volumes | Cut & Fill Volumes | Positive Volume [Cut] value or Areas | Planar AreasPositive Planar Area [cut] value for areas from the report.
  7. Repeat steps 1 - 6, generating a second report with the same grid file as the Upper Surface and the Z level of the second contour as the Lower Surface.
  8. Subtract the second value from the first value to get the volume or area between the two contours.

Using Automation

  • The contarea.bas script calculates the area between evenly spaced contour levels automatically. Download the script, open the BAS file in Scripter (comes with Surfer), and go to Script | Run. Follow the prompts to generate the report.

 

Updated October 31, 2017.

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