环境卫星CCD影像在太湖湖泛暗色水团监测中的应用

太湖地区2009年5月11日、2010年8月21日、2011年7月28日和2011年9月24日的环境卫星CCD影像显示，在太湖西部沿岸带、竺山湖等水域存在湖泛暗色水团现象。由于环境CCD缺少辅助反演气溶胶信息的2.1um波段，试验了基于空气自动监测子站获得的与环境卫星CCD成像时间接近的地面能见度测量数据进行FLAASH大气校正的方法，反演结果总体上符合水体光谱特征。提取了湖泛水体、对照水体阳区在CCD各波段的光谱反射率数据统计特征。结果表明，和对照水体相比，湖泛水体在环境卫星CCD的可见光—近红外波段具有较低的反射率，与人眼观察湖泛水色暗黑的感官一致，另一方面，湖泛水域由于仍有一定的藻类存在，在环境卫星CCD近红外（波段4 ）具有比可见光（波段3）略高的反射率，其规律与基于Landsat ETM的湖泛暗色水团遥感分析结果相一致。

Remote Sensing Monitoring of Black Color Water Blooms in Lake Taihu Based on HT Satellite CCD Data

HJ1 satellite CCD images acquired on May 11,2009,August 21,2010,July 28,2011 and September 24,2011, respectively, showed occurrences of dark color water bloom(DCWB) near the shores of western part of lake Taihu. Due to lack of 2.1um band in HJ1 CCD which is important to the retrieval of aerosol status, the synchronous ground measured visibility data from an ambient air quality station which is geographically close to lake Taihu were used in FLAASH atmospheric correction. Rdsults showed DCWB had lower reflectance at HJ-1CCD bands, 1,2,3 and 4 than reference water bodies, and reflectance at band 4 was gently higher than at band 3, spectral characteristics was in coincidence with those derived from Landsat ETM sources.