Measurement of tree volume by means of non-metric 35mm photography and photogrammetric approach
Forest Mensuration employs certain measurement principles to obtain quantifiable information about the forest for sustainable decision making. In this paper, a photogrammetric alternative employing 35mm non-metric photography has been suggested and used in the preparation of a Standard Volume Table (SVT) for Forest Mensuration. The forester is afforded volume information about trees in less time and at lower cost, without sacrificing accuracy. Comparisons are made between the photogrammetric and traditional methods used by foresters in measuring tree-volume. From the three methods – use of the Spiegel Relaskop, measuring tape on felled tree, and the photogrammetric technique developed in this work, volumes were determined using the Huber formula and a regression equation. The use of measuring tape on felled tree to determine tree volume has been known to provide the most reliable volumetric determinations and commonly serves as a standard for such measurements. Results from the photogrammetric technique compared very well with those obtained using measuring tape on felled tree indicating that , photogrammetric technique herein devised proves a more effective means for deriving Tree Volume Tables, if factors like speed, cost, and convenience are considered.
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