Units of Polygon Volume Tool

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03-08-2021 09:44 AM
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TristanGruppPENN
New Contributor

I calculated volume for a polygon with an area of 22.5 hectares using a TIN. I got a very small volume measure of:  4.3061518071E-05

What are the units of volume in the Polygon Volume Tool?

 

Side note: the TIN was created from an ASTER DEM using a height of 9m to define the plane. I calculated volume below the plane. In the attached image, I'm interested in finding volume for the grey area called "Kanjumarg Cell 1"

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DanPatterson
MVP Esteemed Contributor

What are the coordinate units in?  meters or decimal degrees?


... sort of retired...
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TristanGruppPENN
New Contributor

Angular unit is degree for the TIN (WGS-1984)

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DanPatterson
MVP Esteemed Contributor

Projected data would be best since I see no mention of the data being projected prior to calculations, hence a small coverage in decimal degrees is being interpreted as meters giving rise to the small volume.

Give it a try... project the input data used to derive the TIN (is it raster or vector???), produce the TIN, then derive the volume would be my workflow


... sort of retired...
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