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    Author(s): Grover A. Choate
    Date: 1961
    Source: USDA Forest Service PNW Old Series Research Paper No. 45: 1-26
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (1.5 MB)


    This study investigated the feasibility of developing a technique for estimating site index of Douglas-fir in the Pacific Northwest, using aerial photos and topographic maps. Physiographic features were used as indicators of site index. Analysis showed that although most of the features were highly significant as criteria for predicting site index, they explained less than one-third of its variation. Equations, using the physiographic features as independent variables, were shown to be useful for estimating site index by a double-sampling procedure--particularly in relatively inaccessible places. As a pioneer study, this paper points the way for further productive research in this field.

    Publication Notes

    • Visit PNW's Publication Request Page to request a hard copy of this publication.
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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.


    Choate, Grover A. 1961. Estimating Douglas-fir site quality from aerial photographs. USDA Forest Service PNW Old Series Research Paper No. 45: 1-26

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