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Measuring Trees That Lean, Fork, Crook, or Sweep

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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

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    Also published by SAF:
    Forest Science
    Other SAF Publications
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