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25 July 1989 Earth Surface Physical Measurements Using Space Borne Pushbrooms The Spot Calibration Techniques And New Developments
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Space era has recently made the geophysicists, biologists and geochemists communities aware of the new opportunity to gather earth related data everywhere on the planet by the same space-borne instrument. The emerging space technologies, while giving access to a longer orbital life duration, are allowing a long term data continuity that disciplines such as climatology, geoeconomics, ecology or natural ressources assessment could take advantage of Projects like LANDSAT 6, SPOT 4/5, and various international Polar Platforms are now being developed with a driving requirement of four to six years life duration. Among these new technologies, pushbroom type sensors offer potentially a good radiometric sensitivity and a long life duration. The question is to assess their ability to make the quantitative physical measurements needed for geophysical applications. A complex process made of calibration techniques and inversion algorithms must be designed to establish a link between raw push broom data and physical measurements. This paper describes the efforts undertaken by the Centre National d'Etudes Spatiales within the SPOT program to develop this process of conversion of the pushbroom data into terrestrial and marine surface reflectances in the visible and middle infrared regions. The modelizations and associated coefficients playing a role in the process are defined and the measurements techniques of these coefficients as well as the used inversion algorithms are reviewed.
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Antoine Mizzi and Marc Leroy "Earth Surface Physical Measurements Using Space Borne Pushbrooms The Spot Calibration Techniques And New Developments", Proc. SPIE 1070, Reconnaissance, Astronomy, Remote Sensing and Photogrammetry, (25 July 1989);

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