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Research Note
Title: Stratifying photo plots into volume classes...by crown closure comparator
Author: Aldrich, Robert C.
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
Station ID: RN-PSW-151
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.
Keywords: forest inventory; stand volume; crown closure; crown diameter; aerial surveying; photo interpretation; comparator; stereo comparator
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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.