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Interpreting vegetation reflectance measurements as a function of solar zenith angleSpectral hemispherical-conical reflectances of a nadir looking sensor were taken throughout the day for a lodgepole pine and two grass canopies. Mathematical simulations of both spectral hemispherical-conical and bi-hemispherical reflectances were performed for two theoretical canopies of contrasting geometric structure. These results and comparisons with literature studies showed a great amount of variability of vegetation canopy reflectances as a function of solar zenith angle. Explanations for this variability are discussed and recommendations for further measurements are proposed.
Document ID
19790022441
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Kimes, D. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smith, J. A. (Colorado State Univ. Ft. Collins, United States)
Ranson, K. J. (Colorado State Univ. Ft. Collins, United States)
Date Acquired
September 3, 2013
Publication Date
July 1, 1979
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-TM-80320
Accession Number
79N30612
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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