Locating a position that provides a clear view of the top of the target tree is a major problem when tree heights are being measured in dense conifer stands. A further complication arises if a measured horizontal distance is required, as with conventional hypsometers based on trigonometric principles. The Christen hypsometer, based on geometric principles, does not require a measured horizontal but has been little used, probably because of the instability of the hand-held instrument. A modification of the Christen hypsometer utilizes a staff for stability, thereby enabling greatly increased precision with prolonged use. Since the staff permits positioning the instrument further from the eye, additional gains are then possible via an enlarged scale. For trees over 50 or 60 feet high increasing the length of the standard pole from 10 feet to 18 or 20 feet is recommended.
Document Type: Journal Article
Research Forester, Hiwassee Land Company, Calhoun, Tennessee
Publication date: March 1, 1977
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