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Methods for Measuring Tree Heights Prepared by Ron Flook, the former National Registrar of Notable Trees for the Royal New Zealand Institute of Horticulture.
Ruler & String (Treeby & Arthur) Method This method requires a 30 cm ruler graded to millimetres. Some plastic rulers can be purchased with a hole at one end and this is used for attaching a string 50 cm long. The sketch below shows the detail of taking a position and sighting to the tree. System devised by Bruce Treeby and Gerald Arthur NZTC (Treeby & Arthur, 1988).
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Once the readings have been taken the following graph is used to locate the height of the tree read from the intercept reading on the ruler and the distance from the tree. The tree height is read from the measurement scale graph below in metres.
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Last updated: September 6, 2009