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Proceedings Paper

Functional relation among subpixel canopy cover, ground shadow, and illuminated ground at large sampling scales
Author(s): Michael F. Jasinski
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Paper Abstract

The functional relation among subpixel canopy cover, illuminated soil, and shadowed soil, which progressively develops with increasing pixel size, is investigated for Poisson distributed plants using a geometric canopy simulation model. An analytical relation among cover components is shown to be applicable when the scale of the pixel is much larger than the scale of the plant and ground shadow. The analysis is facilitated through the use of a nondimensional solar-geometric similarity parameter, r, equal to the ratio of the area of one plant canopy to its associated ground shadow area, as viewed from nadir. Use of the similarity parameter generalizes the results without constraining them to any one geometric shape or solar angle. A Sampling Scale Ratio, defined as the ratio of the area of the pixel to the mean area of a single plant shadow, is tested as a quantitative criterion to evaluate when the functional relation among subpixel components occurs. The results of a remote sensing experiment over a natural conifer landscape provide preliminary confirmation of the theoretical analysis.

Paper Details

Date Published: 1 December 1990
PDF: 11 pages
Proc. SPIE 1300, Remote Sensing of the Biosphere, (1 December 1990); doi: 10.1117/12.21389
Show Author Affiliations
Michael F. Jasinski, NASA/Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 1300:
Remote Sensing of the Biosphere
James Alan Smith, Editor(s)

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