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鄱阳湖水位变幅巨大,近年来旱涝灾害严重,对其进行实时监测具有重要意义。MODIS遥感数据时间分辨率很高,在水体动态监测中具有明显优势。水体提取方法多种多样,在比较不同水体提取方法的基础上,最终选用改进的归一化水体指数(MNDWI)的方法进行鄱阳湖水体提取;利用2000～2010年40期MODIS数据分析了鄱阳湖这10a的水面面积年际演变特征及季节性变化特征,同时结合同时期的水位数据,建立了鄱阳湖面积—水位关系的模型。与地形图量测结果的对比表明,遥感解译的鄱阳湖水体面积—水位关系与根据地形图分析建立的面积—水位关系具有较好的一致性。
The water level of Poyang Lake changes greatly, and the droughts and floods are serious in recent years. It is of great significance to carry out real-time monitoring. The temporal resolution of MODIS remote sensing data is very high, which has obvious advantages in dynamic monitoring of water body. Based on the comparison of different water extraction methods, the water body of Poyang Lake was finally selected by the improved normalized water body index (MNDWI) method. Based on 40 MODIS data from 2000 to 2010, Based on the interannual and seasonal variations of the surface area of the 10a and the water level data of the same period, a model of the area-water level relationship of Poyang Lake was established. The comparison with topographic maps shows that the relationship between the area and the water level in Poyang Lake interpreted by remote sensing is in good agreement with the area-water level established by the topographic map analysis.