ADEOS-II was launched successfully on December 14, 2002 by NASDA with H-IIA rocket flight IV, and named as “Midori II”. It carries six Earth observing sensors including Global Imager (GLI) and Advanced Microwave Scanning Radiometer (AMSR) developed by NASDA. These Earth observation sensors obtain data 24 hours a day. The observed data are relayed by “Kodama” (Data Relay Test Satellite (DRTS)), or are directly downlink to NASDA/EOC and foreign ground stations in Kiruna, Alaska, and Wallops. Level-1 and higher level processing is performed by GLI and AMSR data processing systems at EOC to create the science products. The products are archived at Data Storage Systems (DSS) and released to the users according to the requests after the products quality is confirmed through hardware checkout, calibration and validation process. NASDA performed the initial checkout of ADEOS-II satellite and onboard sensor hardware for four months after launch. The following eight months are to be used for the evaluation of ground system and products validation. Summary of ground system evaluation is shown and data processing system is focused.
The Global Imager (GLI) on Advanced Earth Observing Satellite-II (ADEOS-II) launched on 14 December 2002 is an optical sensor to observe reflected solar radiation and infrared radiation. GLI has 36 channels from ultraviolet region (380nm) to thermal infrared (12micron). GLI data is used for understanding the global circulation of carbon, monitoring cloud, snow, ice, and sea surface temperature. NASDA carried out initial checkout to confirm GLI basic function until April 2003. Currently GLI calibration team that consists of sensor development division, ground system integration division, and science application group analyses calibration and validation to release L1 data at the end of this year. This report describes calibration and instrument status of GLI.
The Advanced Earth Observing Satellite-II (ADEOS-II) was launched on 14 December 2002, and its functions were checked until 2003 spring. The Global Imager (GLI) on board ADEOS-II has 36 channels (thirty 1-km resolution, six 250-m resolution) from ultraviolet to thermal infrared to facilitate understanding the global environmental changes in oceans, land and clouds with high accuracy. Ocean algorithms (e.g., ocean atmospheric correction and sea-surface temperature) need highly accurate sensor characterization coefficients because they retrieve sea-surface upward radiance precisely from the top of the atmosphere. The NASDA GLI calibration team includes members of sensor development, ground system integration, and science application groups. The team started investigating GLI characteristics and radio- and geo-correction processes in the initial verification period. In this paper, we will describe the initial results, radiometric accuracy, 12- or 48-detector dependency, scan-mirror surface, incident-angle dependency, and dynamic range related to oceanographic applications.