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

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