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Proceedings Paper

The comparison of BRDF model and validation of MCD43 products by the 2013 Dunhuang Gobi experiments
Author(s): Yuan Li; Zhi-guo Rong; Li-jun Zhang; Ling Sun; Na Xu
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Paper Abstract

BRDF has numerous applications in on-orbit satellites vicarious calibration. The 2013 Dunhuang Gobi surface directional reflectance measurements experiment were held during Aug. 20 to Aug. 28. In order to match the spatial resolution (0.25-1.25km) of meteorological satellites, 3*3 sample points were selected covering the 10*10km area. All the data were measured during (3 hours before and after) the noon without taking into account the large sun zenith angle because of the lack of the satellite passing through. Totally 9 groups of directional reflectance (DREF) were measured by the use of ASD (350-2500nm), standard reference board and a portable DREF measurement system. At each point, DREF were measured by different observation zenith angle (0, 20, 40 and 60 degree) and azimuth angle (0, 45, 90, 135, 180, 225, 270, 315 and 360 degree) in 30 minutes. Different BRDF models were selected such as Walthall, Sine Walthall, Hapke, Roujean and Ross-Li. The model coefficients were derived corresponding to the observed data. The relative differences (RD) of the models with respect to the measured values were calculated. The accuracy of MCD43 products in the Julian day of 233 and 241 were also validated. Results showed that Ross-Li model had the smallest RD. The RD between the DREF from MCD43 products and the measured values were 10.26%(233) and 8.96% (241)@550nm, respectively.

Paper Details

Date Published: 19 November 2014
PDF: 11 pages
Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 926415 (19 November 2014); doi: 10.1117/12.2067763
Show Author Affiliations
Yuan Li, National Satellite Meteorological Ctr. (China)
Zhi-guo Rong, National Satellite Meteorological Ctr. (China)
Li-jun Zhang, National Satellite Meteorological Ctr. (China)
Ling Sun, National Satellite Meteorological Ctr. (China)
Na Xu, National Satellite Meteorological Ctr. (China)

Published in SPIE Proceedings Vol. 9264:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization III
Xiaoxiong Xiong; Haruhisa Shimoda, Editor(s)

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