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    Author(s): Robert C. Aldrich
    Date: 1967
    Source: Res. Note PSW-RN-151. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p
    Publication Series: Research Note (RN)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (0 B)

    Description

    As an aid to aerial photo interpretation, a Crown Closure Comparator has been developed. Printed as a positive film transparency, this device shows tree crowns as open dots on a black background. The Comparator is used to stratify I-acre plots into broad volume classes on single aerial photos using 4 crown-diameter and 9 crown-closure classes. It can also be used for stereo classification with mirror-type stereoscopes.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Aldrich, Robert C. 1967. Stratifying photo plots into volume classes...by crown closure comparator. Res. Note PSW-RN-151. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p.

    Keywords

    forest inventory, stand volume, crown closure, crown diameter, aerial surveying, photo interpretation, comparator, stereo comparator

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