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    Author(s): Ola Lindgren
    Date: 2000
    Source: In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 385-391.
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (437.59 KB)

    Description

    The paper describes results from a large program for quality control of forest measurements. The performance of 87 surveyors was evaluated. Tree heights were usually measured well, whereas the counting of tree-rings on increment cores was a source of considerable bias for many surveyors. During tree count on sample plots, many surveyors had a tendency to forget trees, especially small trees. A conclusion of the study is that control surveys are justified. The control should be continuous during the field season, making it possible to detect inferior quality of work at an early stage.

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    Citation

    Lindgren, Ola 2000. Quality control of measurements made on fixed-area sample plots. In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 385-391.

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