NDLI: Variation in spectral response of soybeans with respect to illumination, view, and canopy geometry

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Variation in spectral response of soybeans with respect to illumination, view, and canopy geometry

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ranson, K. J. Biehl, L. L. Bauer, M. E.
Copyright Year	1984
Description	Comparisons 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.
File Size	10812846
Page Count	28
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850007932
Archival Resource Key	ark:/13960/t70w3b08t
Language	English
Publisher Date	1984-07-31
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Near Infrared Radiation Radiometers Soybeans Earth Resources Program Canopies Vegetation Noon Angles Geometry Satellite Observation Infrared Radiation Sun Spectral Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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