Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 217-220, 2016
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B1/217/2016/
doi:10.5194/isprs-archives-XLI-B1-217-2016
 
03 Jun 2016
EVALUATION OF THE MAIN CEOS PSEUDO CALIBRATION SITES USING MODIS BRDF/ALBEDO PRODUCTS
Said Kharbouche and Jan-Peter Muller Imaging Group, Mullard Space Science Laboratory, University College London, Holmbury St Mary, Surrey, RH56NT, UK
Keywords: Satellites, Calibration, Multi-Spectral, BRDF/Albedo, MODIS Abstract. This work describes our findings about an evaluation of the stability and the consistency of twenty primary PICSs (Pseudo-Invariant Calibration Sites). We present an analysis of 13 years of 8-daily MODIS products of BRDF parameters and white-sky-albedos (WSA) over the shortwave band. This time series of WSA and BRDFs shows the variation of the “stability” varies significantly from site to site. Using a 10x10 km window size over all the sites, the change in of WSA stability is around 4% but the isotropicity, which is an important element in inter-satellite calibration, can vary from 75% to 98%. Moreover, some PICS, especially, Libya-4 which is one of the PICS which is most employed, has significant and relatively fast changes in wintertime. PICS observations of BRDF/albedo shows that the Libya-4 PICS has the best performance but it is not too far from some sites such as Libya-1 and Mali. This study also reveals that Niger-3 PICS has the longest continuous period of high stability per year, and Sudan has the most isotropic surface. These observations have important implications for the use of these sites.
Conference paper (PDF, 1517 KB)


Citation: Kharbouche, S. and Muller, J.-P.: EVALUATION OF THE MAIN CEOS PSEUDO CALIBRATION SITES USING MODIS BRDF/ALBEDO PRODUCTS, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B1, 217-220, doi:10.5194/isprs-archives-XLI-B1-217-2016, 2016.

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