NDLI: Towards a Generalized Approach for Correction of the BRDF Effect in MODIS Directional Reflectances

Content Provider	IEEE Xplore Digital Library
Author	Vermote, E. Justice, C.O. Breon, F.-M.
Copyright Year	1980
Abstract	We propose a new method for the estimation and the correction of directional effect on satellite derived surface reflectance time series. The correction assumes that the shape of the bidirectional reflectance distribution function (BRDF) varies much more slowly than the reflectance magnitude. The BRDF shape is quantified by two parameters R and V which account primarily for surface scattering and volume (canopy) scattering processes. Assuming a constant shape throughout the year permits an easy inversion of the two parameters that are used for a normalization of the reflectance time series to a standard observation geometry. Using this method, the corrected time series of data from the moderate resolution imaging spectroradiometer show much less high frequency variability than the original input data. A refinement of the method accounts for a slow variation of R and V, linearly with the normalized difference vegetation index (NDVI) accounting for vegetation dynamics, and produces an even better correction of directional effects and noise reduction in the time series. The nonlinear short-term variations in the reflectances, which are interpreted as ldquonoise,rdquo are strongly reduced, by a factor of two to four. The reduction in noise in the NDVI time series is less, as the index already implicitly corrects for the directional effects. Nevertheless, the noise in the NDVI time series is reduced by typically 30%-40%. Although the main output of processing using the method is the corrected reflectance, estimates of R and V are also generated. Global and regional map of these parameters show coherent patterns consistent with landcover.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	898
Ending Page	908
Page Count	11
File Size	2089455
File Format	PDF
ISSN	01962892
Volume Number	47
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MODIS Reflectivity Shape Noise reduction Scattering parameters Vegetation mapping Satellites Bidirectional control Distribution functions Geometry vegetation Directional reflectance geophysical measurements Moderate Resolution Imaging Spectroradiometer (MODIS) remote sensing
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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Temporal Constraints on Linear BRDF Model Parameters

Impact of topographic correction on high spectral resolution MODIS sensor satellite imagery of Himalayan region

Towards a Generalized Approach for Correction of the BRDF Effect in MODIS Directional Reflectances

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