NDLI: Estimation of canopy photosynthetically active radiation (PAR) interception using bidirectional aircraft reflectance measurements of the HAPEX-Sahel bush-fallow subsite

Content Provider	IEEE Xplore Digital Library
Author	Hanan, N.P. Brown de Colstoun, E.C. Prince, S.D.
Copyright Year	1995
Description	Author affiliation: Dept. of Geogr., Maryland Univ., College Park, MD, USA (Hanan, N.P.; Brown de Colstoun, E.C.; Prince, S.D.)
Abstract	Visible and near-infrared bidirectional reflectance factors at three view zenith angles in the principal plane of the Sun were collected throughout the growing season of 1992 with airborne radiometers during the HAPEX-Sahel experiment near Niamey, Niger. A coupled radiative transfer model for a discontinuous bush canopy over a continuous herb layer was used to estimate the fractional interception of Photosynthetically Active Radiation (f/sub IPAR/) by the vegetation canopies at several subsites. Results for the bush-fallow subsite located within the west central site are examined. The relationship between instantaneous f/sub IPAR/ and canopy reflectances was investigated using the Normalized Difference Vegetation Index (NDVI) and a novel Normalized Difference Relative Shadow Index (NDRSI) which made use of the additional information obtained by sampling the canopy bidirectional reflectance. The NDVI showed a strong positive relationship with increasing f/sub IPAR/ while the NDRSI showed an equally strong but negative relationship, indicating a potential for bidirectional indices such as NDRSI to estimate canopy variables such as f/sub IPAR/.
Starting Page	1299
Ending Page	1301
File Size	301622
Page Count	3
File Format	PDF
ISBN	0780325672
DOI	10.1109/IGARSS.1995.521731
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-07-10
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scattering Aircraft Reflectivity Bidirectional control Radiometers Remote sensing Vegetation mapping Solar radiation Laboratories Geography
Content Type	Text
Resource Type	Article

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