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    Author(s): Gerald S. Strickler
    Date: 1959
    Source: PNW Old Series Research Notes No. 180, p. 1-5
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (230 KB)


    An instrument known as the spherical densiometer has been found adaptable to permanent-plot estimates of relative canopy closure or density in forest and range ecological studies. The device is more compact and simpler to use than previous ocular-type instruments. Because the instrument has a curved reflecting surface which results in observations from lateral as well as overhead positions, a problem of overlap in readings occurs when adaptation of the densiometer to permanent-plot work is attempted. Some modifications were developed to eliminate this difficulty.

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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.


    Strickler, Gerald S. 1959. Use of the densiometer to estimate density of forest canopy on permanent sample plots. PNW Old Series Research Notes No. 180, p. 1-5

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