The accuracy of a prototype version of Criterion, a digital tree measurement and survey instrument, has been tested for diameter and height measurement. This paper discusses the test procedures,preliminary test results, and recent improvements that have been made on this instrument. Preliminary tests found that the instrument measured diameters accurately but was very inaccurate when used to measure heights of tall objects from a short distance. In addition, Criterion was very cumbersome to use when handheld. South. J. Appl. For. 19(2):65-71.
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