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

Vicarious Calibration of Beijing-1 Multispectral Imagers

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 3.0).

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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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