You can calculate the volume or area between contours either manually or by using a script to automate the process.
Manually
Go
to Grid | Volume, select your grid file and click Open. Use the GRD file as the Upper
Surface and the Z level of the first contour as the constant Lower Surface.
Record
the Positive Volume value for
volumes, or Positive Planar Area
value for areas from the report.
Generate
a second report with the same GRD file as the Upper Surface and the Z level of the second contour as the Lower Surface.
Record
the Positive Volume or Positive Planar Area value from the
second report.
Subtract
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 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.
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