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气溶胶光学厚度对蓝藻水华信息提取的影响

DOI: 10.6046/gtzyyg.2013.01.06, PP. 33-38

Keywords: 气溶胶光学厚度,蓝藻水华,太湖,MODIS

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Abstract:

通过探讨气溶胶光学厚度(AOT)对蓝藻水华信息提取的影响程度和消除方法,为蓝藻水华的动态监测提供可靠依据。首先,利用MODIS数据产品(MOD02,MOD04和MOD09),基于单波段和比值植被指数2种方法分别提取了2006年太湖蓝藻水华的空间分布信息,探讨了AOT对信息提取阈值选择的影响方式和影响程度。研究结果表明:在固定阈值情况下,采用上述2种方法提取的蓝藻水华信息面积差异与AOT的相关性高于自选阈值情况下的相关性;在单波段法和比值植被指数法中,大气校正前所设定的阈值与AOT的相关性都高于大气校正后再选择阈值的相关性。这反映出AOT对蓝藻水华信息提取的影响是不容忽视的,即便不能完全消除,也要选择适当的方法尽量降低其影响程度。

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