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inter-comparison of the Infrared Channels of the Meteorological Imager Onboard COMS and Hyperspectral IASI Data

Advances in Atmospheric Sciences 2015年第7期32卷 979-990页

作者： Dohyeong KIM Myoung-Hwan AHN Minjin CHOI National Meteorological Satellite Center of the Korea Meteorological Administration Department of Atmospheric Science and Engineering Ewha Womans University

The successful launch and commissioning of the first geostationary meteorological satellite of Korea has the potential to enhance earth observation capability over the Asia Pacific region. Although the specifications of the payload, the mete- orological imager （MI）, have been verified during both ground and in-orbit tests, there is the possibility of variation and/or degradation of data quality due to many different reasons, such as the accumulation of contaminants, the aging of instrument components, and unexpected external disturbance. Thus, for better utilization of MI data, it is imperative to continuously monitor and maintain the data quality. As a part of such activity, this study presents an inter-calibration, based on the Global Space-based inter-Calibration System （GSICS）, between the MI data and the high quality hyperspectral data from the In- frared Atmospheric Sounding interferometer （IASI） of the Metop-A satellite. Both sets of data, acquired for three years from April 2011 to March 2014, are processed to prepare the matchup dataset, which is spatially collocated, temporally concurrent, angularly coincident, and spectrally comparable. The results show that the MI data are stable within the specifications and show no significant degradation during the study period. However, the water vapor channel shows a rather large bias value of -0.77 K, with a root-mean-square difference （RMSD） of around 1.1 K, which is thought to be due to the shift in the spectral response function. The shortwave channel shows a maximum RMSD of around 1.39 K, mainly due to the coarse digitization at the lower temperature. The inter-comparison results are re-checked through a sensitivity analysis with different sets of threshold values used for the matchup dataset. Based on this, we confirm that the overall quality of the MI data meets the user requirements and maintains the expected performance, although the water vapor channel requires further investigation.

关键词： meteorological imager inter-comparison instrument long-term stability water vapor channel

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The independent service validation in GMES RESPOND:the flood validation exercise

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international Journal of Digital Earth 2011年第S1期4卷 58-76页

作者： M.Shimoni M.Crosetto S.Lang P.Bally F.Boubila Electrical Engineering Department Signal and Image CentreBelgian Royal Military Academy30Ave de la Renaissance1000BrusselsBelgium Active Remote Sensing Unit Institute of GeomaticsCastelldefelsAvinguda Gauss11E-08860CastelldefelsBarcelonaSpain Z_GIS-Centre for Geoinformatics University of SalzburgSchillerstr 305020SalzburgAustria Science Applications and Future Technologies DepartmentDirectorate of EO ProgrammesEuropean Space AgencyVia Galileo Galileisnc00044Frascati(Roma)Italy

This article is aimed at providing a detailed description of the Flood Validation Exercise organised by the Independent Service Validation Group of the Global Monitoring for Environment and Security(GMES)RESPOND *** aims of the validation exercise were:(1)providing a practical example of validation procedures in the frame of the GMES Emergency Response services;(2)executing a full-scale validation exercise able to cope with the requirements of an emergency service;and(3)better understanding the performances and limitations of Earth observation services for Flood Damage *** validation exercise is a first step of the main task to define the whole validation process for GMES *** this is achieved,there will be knowledge concerning how well services meet the service specifications derived from the user *** present exercise has the purpose of gathering this *** output of this validation exercise can be used to characterise and qualify the performance and timeliness of Crisis and Damage Mapping *** paper summarises the methodology for the flood exercise validation and the results of product validation and inter-comparison.

关键词： flood mapping validation exercise product validation inter-comparison

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