Author Topic: volumetric measurements in Arc?  (Read 4355 times)

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volumetric measurements in Arc?
« on: March 03, 2005, 12:14:37 PM »
Do you have a write-up/cookbook or similar info on how volumetric
measurements are made using topo data with ArcView?

thare

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volumetric measurements in Arc?
« Reply #1 on: March 03, 2005, 12:15:11 PM »
Here is basically a cookbook by Nathan Bryant, doing some Valles Marineris calculations.
http://www.geo.utexas.edu/courses/371c/project/2001/Bryant/Marineris.htm
now only available (missing pictures) in wayback-machine (although tools used are outdated now):
http://replay.web.archive.org/20040710050940/http://www.geo.utexas.edu/courses/371c/project/2001/Bryant/Marineris.htm

Summary:

If the feature has a flat top or bottom like a water body then you don't have to do anything special. You should be able to use the Cut/Fill function found in 3D Analyst. Otherwise, you can just calculate the volume using the "raster calculator" after the area has been clipped or extracted out. For a small volcanic feature with a flat bottom (not on a slope) and assuming you have the topo you can do the same.

If the feature you wish to measure is on a sloped surface then you need to estimate a top or bottom surface to subtract the original surface from. For example, let's take a channel. This can be done by digitizing around the channel feature on the rim and cut away the area you wish to calculate the volume of (channel interior). Then using a neighborhood calculation (boxfilter) you can fill in from the surrounding rim. For large holes it is easier to create a TIN (triangulated irregular network) to fill over the large hole and then convert back to a raster. Either way, you now have an approximated top surface to subtract the original DEM from.

Here is an abstract by Eric Noreen on Valles also:
http://www.lpi.usra.edu/meetings/lpsc2002/pdf/1919.pdf
« Last Edit: April 28, 2011, 08:46:59 PM by thare »

thare

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