NDLI: Diurnal Patterns of Wheat Spectral Reflectances

Content Provider	IEEE Xplore Digital Library
Author	Pinter, Paul J. Jackson, Ray D. Idso, Sherwood B. Reginato, Robert J.
Copyright Year	1980
Abstract	Spectral reflectances of Produra wheat were measured at 13 different times of the day at Phoenix, Arizona, on April 14, 1979 using a nadir-oriented hand-held 4-band radiometer which had bandpass characteristics similar to those on current LANDSAT satellites. Different sun altitude and azimuth angles caused significant diurnal changes in radiant return in both visible and near-IR regions of the spectrum and in several vegetation indices derived from them. The magnitude of these changes were related to different canopy architecture, percent cover, and green leaf area conditions. Spectral measurements taken at each time period were well correlated with green leaf area index but the nature of the relationship changed significantly with time of day. Thus a significant bias in the estimation of green leaf area index (GLAI) from remotely sensed spectral data could occur if sun angles are not properly accounted for.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	156
Ending Page	163
Page Count	8
File Size	2366734
File Format	PDF
ISSN	01962892
Volume Number	GE-21
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1983-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sun Satellite broadcasting Extraterrestrial measurements Radiometry Remote sensing Vegetation Time measurement Stress Current measurement Azimuth
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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