Stratifying photo plots into volume classes...by crown closure comparator

Robert C. Aldrich

Treesearch

Stratifying photo plots into volume classes...by crown closure comparator

Informally Refereed

Authors:

Robert C. Aldrich

Year:

1967

Type:

Research Note

Station:

Pacific Southwest Research Station

Source:

Res. Note PSW-RN-151. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 2 p

Download (PDF 925 KB)

Download (PDF 925 KB): https://research.fs.usda.gov/download/treesearch/37892.pdf

Abstract

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

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.