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Variation in spectral response of soybeans with respect to illumination, view, and canopy geometryComparisons of the spectral response for incomplete (well-defined row structure) and complete (overlapping row structure) canopies of soybeans indicated a greater dependence on Sun and view geometry for the incomplete canopies. Red and near-IR reflectance for the incomplete canopy decreased as solar zenith angle increased for a nadir view angle until the soil between the plant rows was completely shaded. Thereafter for increasing solar zenith angle, the red reflectance leveled off and the near-IR reflectance increased. A 'hot spot' effect was evident for the red and near-IR reflectance factors. The 'hot spot' effect was more pronounced for the red band based on relative reflectance value changes. The ratios of off-nadir to nadir acquired data reveal that off-nadir red band reflectance factors more closely approximated straightdown measurements for time periods away from solar noon. Normalized difference generally approximated straightdown measurements during the middle portion of the day.
Document ID
19850007932
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Ranson, K. J. (Purdue Univ. West Lafayette, IN, United States)
Biehl, L. L. (Purdue Univ. West Lafayette, IN, United States)
Bauer, M. E. (Minnesota Univ.)
Date Acquired
September 5, 2013
Publication Date
July 31, 1984
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
E85-10040
LARS-TR-073184
NAS 1.26:171821
NASA-CR-171821
Accession Number
85N16241
Funding Number(s)
CONTRACT_GRANT: NAS9-16528
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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