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Douglas-Fir beetle survey with color photos


, : Douglas-Fir beetle survey with color photos. Photogramm. Engng, 34: 12, 1243-8

In an epidemic in California, large-scale colour aerial photos (1: 8000) and a stratified two-stage probability sampling design together provided an efficient survey of trees killed by Dendroctonus pseudotsugae. The survey showed that a net total of 535 million board feet of timber had been killed over an area of 1.6 million acres. The survey cost about $0.005 per acre.

US$29.90


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