19 October 2012 A strategy to assess the pointing accuracy of the CERES (FM5) scanner
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Abstract
The Clouds and the Earth’s Radiant Energy System (CERES) scanning radiometer is designed to measure the solar radiation reflected by the Earth and thermal radiation emitted by the Earth. Four CERES instruments are already in service; two aboard the Terra spacecraft, launched in 1999; and two aboard the Aqua spacecraft, launched in 2002. A fifth instrument (FM5), launched in October 2011 aboard the NPP satellite, began taking radiance measurements in January 2012. A technique to validate the computed geolocation of CERES measurements is referred to as a coastline detection algorithm. This technique relies on a rapid gradient change of measurements taken over a well-defined and known Earth target, such as a coastline, where a strong contrast in brightness and temperature exists. The computed coastline is then compared with World Bank II map to verify the accuracy of the measurement location. Our goal is to process the first five months of CERES FM5 data for a preliminary assessment of the pointing accuracy of the FM5 scanner. The paper briefly restates the algorithm used in the study, describes collection of coastline data, and shows results of error in a pixel geolocation in the direction of a scan (XT) and also along the groundtrack of the satellite (AT).
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Nathaniel P. Smith, Z. Peter Szewczyk, Phillip C. Hess, Kory J. Priestley, "A strategy to assess the pointing accuracy of the CERES (FM5) scanner", Proc. SPIE 8510, Earth Observing Systems XVII, 851006 (19 October 2012); doi: 10.1117/12.929952; https://doi.org/10.1117/12.929952
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