12 August 2009 Using BRDF derived from MODIS observations over Dome C to characterize calibration stability and consistency of POS sensors
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Abstract
The stability of surface and atmospheric conditions at the Antarctic Dome Concordia (Dome C) area provides a potential calibration and validation opportunity for sensors on-board polar orbiting satellites (POS). In this study, MODIS observed reflectances at the top of the atmosphere (TOA) over the Dome C site during a one-year period early in the mission are used to derive the bi-directional reflectance distribution function (BRDF). The BRDF is determined by combining the TOA reflectances with the surface BRDF obtained from tower measurements above the Antarctic snow. This study examines the agreement between the BRDF-predicted and TOA-observed reflectances over all available viewing and solar zenith angles. Applying the BRDF to MODIS observed reflectance trends from 2002 to 2009 shows that both Terra and Aqua MODIS are in excellent stable conditions with combined long-term drifts and relative biases within 2% in the VIS and NIR bands. The same BRDF is also applied to TOA reflectances observed by other POS sensors, including NOAA-15, 16, 17, 18, and Metop-A AVHRR and ENVISAT AATSR over the Dome C site in the 2008 summer season. Results show that the BRDF normalized reflectances provide a nearly flat trend for each POS sensor while differences among these sensors clearly indicate their calibration biases.
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Aisheng Wu, Aisheng Wu, Xiaoxiong Xiong, Xiaoxiong Xiong, Changyong Cao, Changyong Cao, } "Using BRDF derived from MODIS observations over Dome C to characterize calibration stability and consistency of POS sensors", Proc. SPIE 7456, Atmospheric and Environmental Remote Sensing Data Processing and Utilization V: Readiness for GEOSS III, 745605 (12 August 2009); doi: 10.1117/12.824743; https://doi.org/10.1117/12.824743
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