基于MODIS数据的西台吉乃尔盐湖水体提取及水域面积的监测

Water Body Extraction and Acreage Monitoring of West Taijinar Salt Lake Based on MODIS Data

西台吉乃尔盐湖具有丰富的镁锂资源,受补给、降水、水文地质条件及人为因素的影响,理化性质和面积有较大变化。通过在湖表水和干盐滩进行样本点采集,统计分析盐湖水体的光谱特征,然后根据MO-D IS数据第1、2波段的反射率和NDVI设定的阈值提取水体,进行水域面积动态变化的监测,结合气象资料,对比分析了西台湖面积的变化情况和原因,对盐湖水体的提取、湖区矿产持续开发利用和水体保护具有一定的指导作用。

West Taijinar salt lake is rich in magnesium and lithium resources. Being affecrcd by recharge, rainfall,human activities and other hydrogeologic conditions, the physicochemical properties and surface area vary largely. Spectral characteristics of the salt lake region have been counted and analyzed according to the sample points collected on lake surface or salina. Then water body of west Taijinar salt lake can be extracted by the reflection threshold of band 1,2 of MODIS and NDVI, and water acreage can be monitored. The changing conditions and reasons are also compared and analyzed through the meteorological data.