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Notes: Remeasuring Tree Heights on Permanent Plots Using Rectangular Coordinates and One Angle Per Tree

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Heights of permanent sample trees with tops visible from any point can be measured from that point with any clinometer, measuring one vertical angle per tree. Two horizontal angles and one additional vertical angle per observation point are necessary to orient the point to the plot. Permanently recorded coordinates and elevations of tree locations are used with the angles to calculate the instrument location and elevation, instrument-to-tree distance, and total tree height. The method is efficient only if a programmable calculator or a computer can be used for calculations. Procedures and formulas are suggested, including formulas for calculating the coordinates of tree locations in a plantation plot from tree identification numbers. Error relationships are discussed. Applications are suggested and one test is described. Forest Sci. 19:233-236.
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Keywords: Spacing studies; computers; stands

Document Type: News

Affiliations: Research Forester, Pacific Southwest Forest and Range Exp. Stn., USDA Forest Service, Berkeley, Calif.

Publication date: 1973-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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