8 April 2003 System definition of the ESA Earth Explorer SPECTRA mission
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The paper describes the system implementation for SPECTRA, which is one of the candidates for the future ESA Earth Explorer Core Missions. The system will enable observations of defined land targets in various spectral bands from the Visible into the Thermal IR and with variable directions of observations. These observations will provide samples of the Bi-directional Reflectance Distribution Function of vegetation. To monitor variations in time of the vegetation properties, the observations will be performed with a revisit of 3 days, assuming cloud-free conditions.
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Umberto Del Bello, Umberto Del Bello, Jean-Loup Bezy, Jean-Loup Bezy, Joachim Fuchs, Joachim Fuchs, Michael Rast, Michael Rast, "System definition of the ESA Earth Explorer SPECTRA mission", Proc. SPIE 4881, Sensors, Systems, and Next-Generation Satellites VI, (8 April 2003); doi: 10.1117/12.463003; https://doi.org/10.1117/12.463003

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