Abstract
Vicarious calibration data screening method based on the measured atmospheric optical depth and the variance of the measured surface reflectance at the test sites is proposed. Reliability of the various calibration data has to be improved. In order to improve the reliability of the vicarious calibration data, some screenings have to be made. Through experimental study, it is found that vicarious calibration data screening would be better to apply with the measured atmospheric optical depth and variance of the measured surface reflectance due to the facts that thick atmospheric optical depth means that the atmosphere contains serious pollution sometime and that large deviation of the surface reflectance from the average means that the solar irradiance has an influence due to cirrus type of clouds. As the results of the screening, the uncertainty of vicarious calibration data from the approximated radiometric calibration coefficient is remarkably improved. Also, it is found that cross calibration uncertainty is poorer than that of vicarious calibration.
Highlights
Visible and Near Infrared mounted on earth observation satellites and the short-wavelength infrared radiation thermometer, Alternative calibration using measurement data on the ground and onboard calibration by the calibration mounting system is performed
In the proposed cross calibration, it is conducted at the same dates for field campaigns because the vicarious calibration data can be used for cross calibration
Vicarious calibration data screening method based on the measured atmospheric optical depth and the variance of the measured surface reflectance at the test sites is proposed
Summary
Visible and Near Infrared mounted on earth observation satellites and the short-wavelength infrared radiation thermometer, Alternative calibration using measurement data on the ground and onboard calibration by the calibration mounting system is performed. The skyradiometer allows measurement of solar direct, diffuse and aureole that results in estimation of refractive index and size distribution of aerosol particles [19]. Improved Modified Langley method as the calibration method of sky-radiometer and as the method for estimation of extraterrestrial solar irradiance as well as atmospheric optical depth is proposed by Arai. Vicarious calibration data are used to be suffered from atmospheric conditions, existing cirrus clouds, smoke from wild fire that happens nearby test sites, enthused gasses from automobiles that situated nearby the test sites, and so on.
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