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This work describes our findings about an evaluation of the stability and the consistency of twenty primary PICSs (Pseudo-Invariant\udCalibration Sites). We present an analysis of 13 years of 8-daily MODIS products of BRDF parameters and white-sky-albedos\ud(WSA) over the shortwave band. This time series of WSA and BRDFs shows the variation of the “stability” varies significantly from\udsite 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\udis an important element in inter-satellite calibration, can vary from 75% to 98%. Moreover, some PICS, especially, Libya-4 which is\udone of the PICS which is most employed, has significant and relatively fast changes in wintertime. PICS observations of\udBRDF/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.\udThis study also reveals that Niger-3 PICS has the longest continuous period of high stability per year, and Sudan has the most\udisotropic surface. These observations have important implications for the use of these sites

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

EVALUATION OF THE MAIN CEOS PSEUDO CALIBRATION SITES USING MODIS BRDF/ALBEDO PRODUCTS