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    Author(s): R. S. Driscoll; P. O. Currie; M. J. Morris
    Date: 1972
    Source: In: Proceedings, 38th Annual American Society Photogrammetry Meeting; Washington, D.C.; March 12-17, 1972. Falls Church, VA: American Society Photogrammetry. p. 358-365.
    Publication Series: Paper (invited, offered, keynote)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (348.0 KB)

    Description

    Green standing herbage of seeded big bluegrass (Poa ampla) and corresponding dry weight were each regressed as dependent variables (Y) on color infrared photo image density (X) obtained from two photoscales: 1:563 and 1:3855. Standing crop biomass expressed by the linear equation: Y = a + b(X) was from the 1:563 photoscale. The coefficient of determination r2 = 0.752) between image density and harvested dry weight was highly significant (P = 0.01). The same regression using the smaller photoscale (1:3855), although significant (P = 0.05), was not as good (r2 = 0.639). Mean image density of six simulated productivity levels was significantly different (P = 0.05) among most levels of production represented in both photo scales.

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    Citation

    Driscoll, R. S.; Currie, P. O.; Morris, M. J. 1972. Estimates of herbaceous standing crop by microdensitometry. In: Proceedings, 38th Annual American Society Photogrammetry Meeting; Washington, D.C.; March 12-17, 1972. Falls Church, VA: American Society Photogrammetry. p. 358-365.

    Keywords

    herbaceous standing crop, microdensitometry, big bluegrass, Poa ampla, image density, photo scales

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https://www.fs.usda.gov/treesearch/pubs/59373