GMS画像データのキャリブレーション処理、画像準備処理および大気減衰補正処理について

抄録

This article shows three procedures, calibration, pre-processing and atmosheric attenuation correction for the Geostationary Meteorological Satellite (GMS) image data, which have been used for operational purposes at the Meteorological Satellite Center (MSC). Those are essential to process the image data for extracting the meteorological information like those cloud wind vector, cloud topheight, etc. The VISSR (Visible and Infrared Spin Scan Radiometer) calibration programs ensure the infrared (IR) level counts-to-equivalent black body temperature conversion table and the visible (VIS) level counts-to-albedo conversion table, based on needed information obtained from the telemetry data. The pre-processing program has several functions of implantation of missing scan line, blocking and sampling, registration, etc. Results are stored on a disk file to realize a high-speed access for displaying the image data on TV-display. IR channel of VISSR observes radiances in 10.5-12. 5μm region of spectrum. In this region is attenuated by the atmosphere. The empirical correction program for atmosheric absorption has been developed using the climatological vertical temperature and dew point temperature profile data.