3 October 1998 Determination of spatial characteristics by using the spectro-radiometric calibration assembly (SRCA) of MODIS: I. Along-scan
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Abstract
The Spectro-Radiometric Calibration Assembly (SRCA) is briefly described. This paper discusses one of the SRCA functions -- spatial calibration to determine the channel position shift along-scan. The band centroid shift along- track will be discussed in Part II. Discussion in this part mainly focuses on the algorithm, the methodology, and the stability of the calibration signals. The algorithm and the methodology includes: a model of the image motion as a function of data sample and the centroid calculation to determine the detector/band positions. The SRCA stability is examined by checking the data inconsistencies between redundant samples, sub-samples, and the two mirror sides. Also described is the handling of the dark-reading for the thermal bands, which is affected by background energy for the opaque part of the reticle. A series of results are presented, which compare the relative position shift and co- registration between channels, bands, and Focal Plane Assemblies. Test results are illustrated for calibration under different environments and by different instruments. These results indicate that the SRCA is a stable an sensitive calibrator which provides consistent results. The overall uncertainty analysis will be presented in Part II.
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Harry E. Montgomery, Harry E. Montgomery, Nianzeng Che, Nianzeng Che, Jeff Bowser, Jeff Bowser, "Determination of spatial characteristics by using the spectro-radiometric calibration assembly (SRCA) of MODIS: I. Along-scan", Proc. SPIE 3439, Earth Observing Systems III, (3 October 1998); doi: 10.1117/12.325628; https://doi.org/10.1117/12.325628
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