ENTS,
Bobs formula gives a good calculation of crown volume for these flattened dome
shaped trees. As a quick calculation in the field, you can treat many of these
forms as 1/2 of a scalene ellipsoid. (1/2 egg shaped). To do a quick rough
volume estimate measure the two major axis of the crown spread and the height.
Then:
Volume = length major axis x length minor axis x height x 0.5
Thi is not perfect because this calculation assumes the full half elispse is
present with the sides starting vertical and curving over to form the top of
the crown, when in fact many of these represent portions off the top rather
than a full hemisphere of the ellipsoid.
Ed
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Eastern Native Tree Society http://www.nativetreesociety.org
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