19 November 2014 Automated test-site radiometer for vicarious calibration
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In order to realize unmanned vicarious calibration, Automated Test-site Radiometer (ATR) was developed for surface reflectance measurements. ATR samples the spectrum from 400nm-1600 nm with 8 interference filters coupled with silicon and InGaAs detectors. The field of view each channel is 10 ° with parallel optical axis. One SWIR channel lies in the center and the other seven VNIR channels are on the circle of 4.8cm diameters which guarantee each channel to view nearly the same section of ground. The optical head as a whole is temperature controlled utilizing a TE cooler for greater stability and lower noise. ATR is powered by a solar panel and transmit its data through a BDS (China’s BeiDou Navigation Satellite System) terminator for long-term measurements without personnel in site. ATR deployed in Dunhuang test site with ground field about 30-cm-diameter area for multi-spectral reflectance measurements. Other instruments at the site include a Cimel sunphotometer and a diffuser-to-globe irradiance meter for atmosphere observations. The methodology for band-averaged reflectance retrieval and hyperspectral reflectance fitting process are described. Then the hyperspectral reflectance and atmospheric parameters are put into 6s code to predict TOA radiance which compare with MODIS radiance.
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Xin Li, Xin Li, Ya-peng Yin, Ya-peng Yin, En-chao Liu, En-chao Liu, Yan-na Zhang, Yan-na Zhang, Li-na Xun, Li-na Xun, Wei Wei, Wei Wei, Zhi-peng Zhang, Zhi-peng Zhang, Gang-gang Qiu, Gang-gang Qiu, Quan Zhang, Quan Zhang, Xiao-bing Zheng, Xiao-bing Zheng, } "Automated test-site radiometer for vicarious calibration", Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92640V (19 November 2014); doi: 10.1117/12.2069783; https://doi.org/10.1117/12.2069783

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