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Application of Ground-Oblique Photographs to the Measurement of Standing Trees

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Abstract:

The mensurational defects of tilted ground photographs cannot be overcome by simple mathematical means. The Mobius grid is a convenient tool for making accurate measurements from projected photographic images. A method of constructing a Mobius grid is described. A test on 20 sample trees showed that the regression of taped diameters on Mobius grid diameters had a coefficient of determination of 97 percent. Mean diameters measured on groups of photographed trees are likely to be within ±2 percent of taped diameters, though individual photo diameters may differ by ±12 percent. Forest Sci. 17:46-50.

Keywords: crown structure; measurement techniques

Document Type: Journal Article

Affiliations: Dep. of Forestry, Ibadan University, Nigeria

Publication date: March 1, 1971

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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