应用双光谱云图判识梅雨锋云系降水等级

用１９９１年梅雨期间的部分ＧＭＳ红外，可见光数字云图及同时的地面实测降水资料，从分析各等级降水云的二维频数分布着后，探求降水强度与红外，可见光亮度值之间的关系，最终实现用红外，可见光双光谱阈值法判识大暴雨，暴雨，大雨，中小雨４个等级的降水云。

CATEGOTY IDENTIFICATION OF RAINFALL FROM MEIYU FRONT CLOUDS BY USE OF BI-SPECTRAL CLOUD MAPS

Part or GMS infrared,visible digital cloud maps and synchronous measurementsof rainfall during the 1991 Meiyu wet period are used to investigate the relations of tainfallintensity to the brightness on the IR and visible maps by examining the 2D frequency ofclouds producing precitation of different categories, and based on these relations obtainedthe precipitating clouds(for heavy raingush,rainstorm,hard rain and moderate-light rainfall)are identified in terms of the bi-spectral(IR and visible)thresholds, with total accuracyreaching 73.4%and the acctiracy higher in the case of weak precipitation clouds than ofstrong ones .