NDLI: Soybean canopy reflectance as a function of view and illumination geometry

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Soybean canopy reflectance as a function of view and illumination geometry

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ranson, K. J. Biehl, L. L. Robinson, B. F. Vanderbilt, V. C.
Copyright Year	1982
Description	The results of an experiment designed to characterize a soybean field by its reflectance at various view and illumination angles and by its physical and agronomic attributes are presented. Reflectances were calculated from measurements at four wavelength bands through eight view azimuth and seven view zenith directions for various solar zenith and azimuth angles during portions of three days. An ancillary data set consisting of the agronomic and physical characteristics of the soybean field is described. The results indicate that the distribution of reflectance from a soybean field is a function of the solar illumination and viewing geometry, wavelength and row direction, as well as the state of development of the canopy. Shadows between rows greatly affected the reflectance in the visible wavelength bands and to a lesser extent in the near infrared wavelengths. A model is proposed that describes the reflectance variation as a function of projected solar and projected viewing angles. The model appears to approximate the reflectance variations in the visible wavelength bands from a canopy with well defined row structure.
File Size	1444598
Page Count	17
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820024940
Archival Resource Key	ark:/13960/t6q001k8v
Language	English
Publisher Date	1982-04-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Radiometers Soybeans Earth Resources Program Canopies Vegetation Infrared Spectra Zenith Solar Position Spectral Reflectance Plowing Wavelengths Azimuth Agristars Project Visible Spectrum Farmlands View Effects Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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