Tree crown measurement device

Alan Harrison harrisa at
Thu Sep 29 11:09:46 EST 1994

Hello,  I am looking for a device which will assist in the measurement of
tree crown diameter.  I have a copy of the U.S. Department of Agricultre's
publication "How To Measure Tree Crown Widths" which describes how to build
an instrument using a double penta prism, a bulls-eye spirt level and a
staff.  I do not doubt that this design will work, but I am concerned that
the instrument could easily be knocked out of adjustment.  Further, if there
is an instrument commercially available I would rather go that route.

If you could share any information with me, it will be appreciated.

Alan Harrison
Ontario Forest Research Institute
1235 Queen Street East
P.O. Box 969
Sault Ste. Marie, Ontario
P6A 5N5

Phone:  (705)946-2981
Fax:    (705)946-2030
e-mail: harrisa at

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