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Remote Sens. 2014, 6(2), 1432-1450; doi:10.3390/rs6021432

Vicarious Calibration of Beijing-1 Multispectral Imagers

*  and
Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China
* Author to whom correspondence should be addressed.
Received: 15 November 2013 / Revised: 21 January 2014 / Accepted: 22 January 2014 / Published: 18 February 2014
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For on-orbit calibration of the Beijing-1 multispectral imagers (Beijing-1/MS), a field calibration campaign was performed at the Dunhuang calibration site during September and October of 2008. Based on the in situ data and images from Beijing-1 and Terra/Moderate Resolution Imaging Spectroradiometer (MODIS), three vicarious calibration methods (i.e., reflectance-based, irradiance-based, and cross-calibration) were used to calculate the top-of-atmosphere (TOA) radiance of Beijing-1. An analysis was then performed to determine or identify systematic and accidental errors, and the overall uncertainty was assessed for each individual method. The findings show that the reflectance-based method has an uncertainty of more than 10% if the aerosol optical depth (AOD) exceeds 0.2. The cross-calibration method is able to reach an error level within 7% if the images are selected carefully. The final calibration coefficients were derived from the irradiance-based data for 6 September 2008, with an uncertainty estimated to be less than 5%.
Keywords: vicarious calibration; Beijing-1; reflectance-based method; irradiance-based method; cross-calibration; Dunhuang site vicarious calibration; Beijing-1; reflectance-based method; irradiance-based method; cross-calibration; Dunhuang site
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Chen, Z.; Zhang, B.; Zhang, H.; Zhang, W. Vicarious Calibration of Beijing-1 Multispectral Imagers. Remote Sens. 2014, 6, 1432-1450.

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