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Monitoring reflectance of polar icecaps has relevance in climate studies. Climate changes produce variations in the morphology of ice and snow covers, which are detectable as surface reflectance change. Surface reflectance can be retrieved from remotely sensed data. However, absolute values independent of atmospheric turbidity and surface altitude can only be obtained after removing masking effects of the atmosphere. An atmospheric correction model, accounting for surface and sensor altitudes above sea level, is described and validated through data detected over Antarctic surfaces with a Barnes modular multi-spectral radiometer having bands overlapping those of the Landsat Thematic Mapper. The model is also applied in a sensitivity analysis to investigate error induced in reflectance obtained from satellite data by indeterminacy in optical parameters of atmospheric constituents. Results show that indeterminacy in the atmospheric water vapour optical thickness is the main source of problems in the retrieval of surface reflectance from data remotely sensed over Antarctic regions.

Additional information

Authors: ZIBORDI G, National Research Council, Institute for the Study of Geophysical and Environmental Methodologies, Modena (IT);MARACCI G, JRC Ispra (IT)
Bibliographic Reference: Article: Remote Sensing of Environment, Vol. 43 (1993) pp. 11-21
Record Number: 199311541 / Last updated on: 1994-11-28
Original language: en
Available languages: en