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Photogrammetric Determination of Red Pine Terminal Leader Elongation

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A nondestructive technique for measuring terminal leader length of Pinus resinosa Ait. over 30 feet in height is proposed and field tested. Terminal leaders are photographed from towers and the leader lengths calculated using photogrammetric relationships. Results indicate that a measurement based on one exposure should be correct within ± 1.14 inches. This accuracy can be increased by taking the average of more than one exposure per leader. If enough measurements are to be made to warrant the initial equipment cost, the determinations can be made with this technique to a comparable or greater accuracy, in less time and less expense, than with previously used methods. Also, a permanent photographic record of leader growth is obtained.

Document Type: Journal Article

Affiliations: Professor of Silviculture, Dept. of Silviculture, State Univ. College of Forestry at Syracuse University, Syracuse, N. Y.

Publication date: June 1, 1967

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