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  • The impact of multi-angular measurements on the accuracy of land-surface albedo retrieval: Preliminary results for the proposed ESA LSPIM mission


This paper documents, through a sensitivity study, the retrieval accuracy of the albedo and the bi-directional reflectance factor (BRF) field as a function of the number of observations and their angular distribution. A BRF database is generated for different surface types, solar positions and wavelengths. A realistic amount of random noise is added to approximate actual measurement conditions. A parametric BRF model is inverted against the noisy data strings of variable lengths and subsequently used in a forward mode to reconstruct the BRF field and estimate the albedo. The retrieval accuracy is estimated by comparing the original and the reconstructed fields and values. For a single observation, the retrieval accuracy based on the assumption of a Lambertian surface reflectance is compared to the one based on the assumption of a typical BRF field.

Additional information

Authors: VOGT P ET AL, JRC, SAI, GVM, Ispra (IT);MENENTI M, Universite Louis Pasteur, Illkirch (FR);CARAMAGNO A, GMV, Madrid (ES);RAST M, ESA/ESTEC, Noordwijk (NL)
Bibliographic Reference: An article published in: Remote Sensing Reviews, Vol.19 (2000), pp.191-204
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