Pacific Southwest

Title: Evaluating stream trout habitat on large-scale aerial color photographs

Author: Greentree, Wallace J.; Aldrich, Robert C.

Date: 1976

Source: Res.Pap. PSW-123. Berkeley,CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 21 p

Station ID: RP-PSW-123

Description: Large-scale aerial color photographs were used to evaluate trout habitat by studying stream and streambank conditions. Ninety-two percent of these conditions could be identified correctly on the color photographs. Color photographs taken 1 year apart showed that rehabilitation efforts resulted in stream vegetation changes. Water depth was correlated with film density: 76.4 percent on normal color film and 73.5 percent on infrared film. Shadow-length measurements of streambank vegetation height were 86 percent accurate. A technique to measure the degree of shade created by streambank vegetation is described. The cost of large-scale color evaluation of trout habitat was estimated to be from $200 to $250 per mile of stream.

Keywords: trout habitat, photointerpretation, habitat evaluation

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Citation

Greentree, Wallace J.; Aldrich, Robert C.   1976.  Evaluating stream trout habitat on large-scale aerial color photographs.   Res.Pap. PSW-123. Berkeley,CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 21 p.