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Evaluation of the Main CEOS Pseudo Calibration Sites Using MODIS BRDF/ALBEDO Products

Kharbouche, S; Muller, J-P; (2016) Evaluation of the Main CEOS Pseudo Calibration Sites Using MODIS BRDF/ALBEDO Products. In: Halounova, L and Šafář, V and Toth, CK and Karas, J and Huadong, G and Haala, N and Habib, A, (eds.) XXIII ISPRS Congress: Commission I [Proceedings]. (pp. pp. 217-220). Copernicus Gesellschaft MBH Green open access

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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.

Type: Proceedings paper
Title: Evaluation of the Main CEOS Pseudo Calibration Sites Using MODIS BRDF/ALBEDO Products
Event: XXIII ISPRS Congress, 12–19 July 2016, Prague, Czech Republic
Open access status: An open access version is available from UCL Discovery
DOI: 10.5194/isprsarchives-XLI-B1-217-2016
Publisher version: http://www.int-arch-photogramm-remote-sens-spatial...
Language: English
Additional information: Published under the Creative Common Attribution 3.0 License (http://creativecommons.org/licenses/by/3.0/)
Keywords: Satellites, Calibration, Multi-Spectral, BRDF/Albedo, MODIS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1542487
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