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Proceedings Paper

In-flight absolute radiometric calibration of MODIS using the irradiance-based method
Author(s): Wei Wei; Xin Li; Chun-yan Zhao; Gang-gang Qiu; Xiao-bing Zheng
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Paper Abstract

In order to reduce the calibration uncertainty of the reflectance-based method brought by the assumption of the aerosol model, the irradiance-based method, known as improved reflectance-based method, was proposed. The irradiance-based method is described in this paper. The radiometric calibration field campaign was performed at Dunhuang test site on 27 August, 2014. A hyperspectral irradiance meter (HSIM) developed by Anhui Institute of Optics and Fine Mechanics (AIOFM) was used to measure the diffuse-to-global spectral irradiance ratio. The irradiance-based method and the reflectance-based method were performed to calibrate the first four bands of Moderate Resolution Imaging Spectroradiometer (MODIS). The results of two methods were compared with result of MODIS on-board calibrator. The comparison shows that the result of irradiance-based method has a good consistency with on-board calibration and reflectance-based method results. The difference of calibration coefficients between irradiance-based and on-board method was less than 1.4%. Due to the limitations of the irradiance-based method, a clear sky and stable atmospheric condition is required for the entire half of the calibration day to provide the data necessary for the extrapolation of diffuse-to-global ratio in viewing direction. A study on the effects of aerosol mode assumption on the final apparent reflectance was performed on both the irradiance-based method and the reflectance-based method by selecting different aerosol modes to predict the apparent reflectance. The results show that aerosol mode assumption has a great effect on the reflectance-based method, however slight effect on the irradiance-based method.

Paper Details

Date Published: 25 October 2016
PDF: 8 pages
Proc. SPIE 10156, Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology, 101561M (25 October 2016); doi: 10.1117/12.2247217
Show Author Affiliations
Wei Wei, Anhui Institute of Optics and Fine Mechanics (China)
Univ. of Science and Technology of China (China)
Xin Li, Anhui Institute of Optics and Fine Mechanics (China)
Chun-yan Zhao, Anhui Institute of Optics and Fine Mechanics (China)
Gang-gang Qiu, Anhui Institute of Optics and Fine Mechanics (China)
Univ. of Science and Technology of China (China)
Xiao-bing Zheng, Anhui Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 10156:
Hyperspectral Remote Sensing Applications and Environmental Monitoring and Safety Testing Technology

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