NDLI: Biophysical parameter retrievals using bidirectional measurements

Content Provider	IEEE Xplore Digital Library
Author	Qi, J. Cabot, F. Moran, M.S. Dedieu, G. Thome, K.J.
Copyright Year	1994
Description	Author affiliation: USDA-ARS-Water Conservation Lab., Phoenix, AZ, USA (Qi, J.)
Abstract	Measurements with oblique viewing angles can provide complementary information about land surfaces since these measurements reveal structural aspects while nadir measurements do not. Consequently, bidirectional measurements can be used to characterize surface biophysical properties. In this study, the authors developed an algorithm that combined bidirectional measurements with three existing bidirectional reflectance distribution function (BRDF) models to retrieve surface physical parameters such as leaf area index (LAI). The algorithm was applied to a multidirectional reflectance data set collected during an experiment at Maricopa Agricultural Center in 1991 over three different types of land surfaces (recently harvested alfalfa, pecan, and cotton). It was further validated with ground-based multitemporal reflectance measurements over a growing wheat canopy in 1983. Preliminary results showed that the algorithm was promising in retrieval of LAI and had potential to monitor vegetation growth on an operational basis.
Starting Page	1816
Ending Page	1818
File Size	391605
Page Count	3
File Format	PDF
ISBN	0780314972
DOI	10.1109/IGARSS.1994.399574
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-08-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Vegetation Land surface Reflectivity Bidirectional control Sensor arrays Area measurement Distribution functions Information retrieval US Department of Agriculture Laboratories
Content Type	Text
Resource Type	Article

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