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
Preview |
Text
isprs-archives-XLI-B1-217-2016.pdf - Published Version Download (1MB) | Preview |
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 |
Archive Staff Only
View Item |