Dendrometer

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Trigonometric height determination
The dendrometer developed by Horst Kramer at the Institute for Forest Management and Yield Science at the Georg-August University in Göttingen .

A dendrometer ( Greek , tree knife ) is an instrument used to measure the size or height of trees . It can be a simple tape measure or a protractor with which the height can be estimated from the knowledge of a reference distance. Electronic devices with strain gauges can record growth over time.

The thickness of a tree is calculated by using a measuring tape on which the measuring units are 3.14159 cm ( Pi ) apart. If you measure the circumference of a tree (at a height of approx. 140 cm) with 30 measuring units with such a tape, the result is that the tree is 30 cm thick. This is derived from the circumference formula of the circle L = d * Pi. There is a fixed ratio between circumference and diameter.

The picture shows a simple protractor. If a reference value is known, for example the angle, the distance AD , the distances AB and BC , the tree height can be determined trigonometrically. One application is the protractor according to Horst Kramer .

There are dendrometers that can use electronics to measure and log changes in stem radius in the micrometer range.

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Footnotes

  1. The water tree household (2012)