An operational algorithm is proposed to retrieve soil and foliage component temperatures over heterogeneous land surface based on the analysis of bi-angular multi-spectral observations made by ATSR-2. Firstly, on the basis of the radiative transfer theory in a canopy, a model is developed to infer the two component temperatures using six channels of ATSR-2. Four visible, near-infrared and short wave infrared channels are used to estimate the fractional vegetation cover within a pixel. A split-window method is developed to eliminate the atmospheric effects on the two thermal channels. An advanced method using all four visible, near-infrared and short wave channel measurements at two view angles is developed to perform atmospheric corrections in those channels allowing simultaneous retrieval of aerosol opacity and land surface bi-directional reflectance. Secondly, several case studies are undertaken with ATSR-2 data. The results indicate that both foliage and soil temperatures can be retrieved from bi-angular surface temperatures measurements. Finally, limitations and uncertainties in retrieving component temperatures using the present algorithm are discussed.
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Document Type: Research Article
Institute for Computational Earth System Science University of California Santa Barbara USA
TRIO/LSIIT Université Louis Pasteur 5 Bld Sebastien Brant 67400 Illkirch France, Email: [email protected]
ALTERRA Green World Research Wageningen University and Research Centre PO Box 47 6700AA Wageningen The Netherlands, Email: [email protected]
National Aerospace Laboratory 8316 PR Marknesse The Netherlands
Publication date: December 1, 2003
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