17 November 2014 Spatial sampling considerations of the CERES (Clouds and Earth Radiant Energy System) instrument
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The CERES (Clouds and Earth Radiant Energy System) instrument is a scanning radiometer with three channels for measuring Earth radiation budget. At present CERES models are operating aboard the Terra, Aqua and Suomi/NPP spacecraft and flights of CERES instruments are planned for the JPSS-1 spacecraft and its successors. CERES scans from one limb of the Earth to the other and back. The footprint size grows with distance from nadir simply due to geometry so that the size of the smallest features which can be resolved from the data increases and spatial sampling errors increase with nadir angle. This paper presents an analysis of the effect of nadir angle on spatial sampling errors of the CERES instrument. The analysis performed in the Fourier domain. Spatial sampling errors are created by smoothing of features which are the size of the footprint and smaller, or blurring, and inadequate sampling, that causes aliasing errors. These spatial sampling errors are computed in terms of the system transfer function, which is the Fourier transform of the point response function, the spacing of data points and the spatial spectrum of the radiance field.
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G. Louis Smith, G. Louis Smith, Natividdad Manalo-Smith, Natividdad Manalo-Smith, Kory Priestley, Kory Priestley, "Spatial sampling considerations of the CERES (Clouds and Earth Radiant Energy System) instrument", Proc. SPIE 9244, Image and Signal Processing for Remote Sensing XX, 92441O (17 November 2014); doi: 10.1117/12.2065735; https://doi.org/10.1117/12.2065735


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