Bayesian Estimation for Land Surface Temperature Retrieval: The Nuisance of Emissivities

Details Bayesian Estimation for Land Surface Temperature Retrieval: The Nuisance of Emissivities Bayesian Estimation for Land Surface Temperature Retrieval: The Nuisance of Emissivities

2004-02-19

arxiv.org/abs/physics/0402099v3

IEEE Transactions on Geoscience and Remote Sensing 43, p. 1279 (June 2005)

Physics

Data Analysis, Statistics and Probability

Table 3 has been replaced, and the discussion in Section IV has been revised, to reflect corrected Monte Carlo simulations. Te

Scientific paper

10.1109/TGRS.2005.845637

An approach to the remote sensing of land surface temperature is developed using the methods of Bayesian inference. The starting point is the maximum entropy estimate for the posterior distribution of radiance in multiple bands. In order to convert this quantity to an estimator for surface temperature and emissivity with Bayes' theorem, it is necessary to obtain the joint prior probability for surface temperature and emissivity, given available prior knowledge. The requirement that any pair of distinct observers be able to relate their descriptions of radiance under arbitrary Lorentz transformations uniquely determines the prior probability. Perhaps surprisingly, surface temperature acts as a scale parameter, while emissivity acts as a location parameter, giving the prior probability P(T,emissivity|K)=const./T dT d(emissivity). Given this result, it is a simple matter to construct estimators for surface temperature and emssivity. Monte Carlo simulations of land surface temeprature retrieval in selected MODIS bands are presented as examples of the utility of the approach.

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