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The need to obtain surface albedo measurements for climate models and the desire to use remote sensing tools to describe the nature and evolution of terrestrial ecosystems both hinge on the capability to describe the bidirectional reflectance of natural surfaces, as it is observed on board satellites. In this paper, the various radiation models that have been applied to these problems, either in direct mode to generate the reflectance and the albedo of known porous media, or in inverse mode to retrieve the characteristics of the surface from remote sensing measurements, are reviewed. Issues related to the validation and to the inversion of these models are discussed, and outstanding challenges are outlined.

Additional information

Authors: PINTY B, Laboratoire d'Etudes et de Recherches en Télédétection Spatiale, Toulouse (FR);VERSTRAETE M M, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 5th International Colloquium on Physical Measurements and Signatures in Remote Sensing, Courchevel (FR), Jan. 14-18, 1991
Availability: Available from (1) as Paper EN 36753 ORA
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