Measuring Trees That Lean, Fork, Crook, or Sweep
Author: Grosenbaugh, L. R.
Source: Journal of Forestry, Volume 79, Number 2, 1 February 1981 , pp. 89-92(4)
Publisher: Society of American Foresters
Abstract:Until recently there was no fully satisfactory solution to the broad problem of measuring standing trees whose axes leaned, forked, crooked, or curved. Analysis of a spherical model has led to revision of a well-known computer program (STX) that will now process standard rangefinder-dendrometer measurements of straight leaning trees without bias, and similar measurements of forked, crooked, or curved trees with negligible bias. More field effort is required if instruments lack rangefinding capability. Azimuth of crosslevel axis and tilt of hypsometer aligned with tree axis must then be measured from each of two separate observation points to enable computation of a constant correction angle to be added algebraically to each tilted elevation angle. Corrected elevation angles together with a single range (measured parallel to the ground} will then allow unbiased computation of other elevated slant ranges, slant heights, and diameters.
Document Type: Journal Article
Affiliations: Adjunct Professor, School of Forest Resources and Conservation, University of Florida, Gainesville
Publication date: February 1, 1981
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