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Mean top height - a loose concept in New Zealand
Authors: Euan MasonPublication: New Zealand Journal of Forestry, Volume N.Z.J.For. 2019, Issue N.Z.J.For. 64(2) 2019, pp 32-36, Aug 2019
Publisher: New Zealand Institute of Forestry
Abstract: New Zealand has two definitions of mean top height (MTH). While these are equivalent in plots where all heights are measured, they were found to produce different MTH estimates if unmeasured heights were estimated by height versus diameter (H-D) curves, and differences were greater when H-D curves were fitted at a stand-level rather than at a plot-level. In addition, use of stand-level H-D curves to estimate unmeasured heights of trees resulted in large underestimates of between plot MTH variance, thereby underestimating likely errors of stand-level estimates of MTH.