Correlated Observer Errors and their Effects on Survey Estimates of Needle-Leaf Loss

Authors: Gertner, George; Köhl, Michael

Source: Forest Science, Volume 41, Number 4, 1 November 1995 , pp. 758-776(19)

Publisher: Society of American Foresters

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Abstract:

In Europe, crown transparency is one of the most important variables assessed for monitoring forest conditions. Though there are very strict international guidelines and intensive training programs for the evaluation of needle-leaf loss, there still exists a subjective component in the evaluation. This subjective component in the observation process can lead to a nonsampling error that can greatly reduce the precision of estimates of average needle-leaf loss. In this paper, methods for quantifying the potential loss in precision are presented and applied to data from the Swiss National Forest Health Monitoring Program. For. Sci. 41(4):758-776.

Document Type: Journal article

Affiliations: 1: Leader of Inventory Research Group, Swiss Federal Institute of Forestry, Snow and Landscape Research, CH-8903 Birmensdorf, Switzerland

Publication date: 1995-11-01

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