淡水湖泊湿地水体信息提取方法

及时、准确地获得水体信息是对水资源保护、利用和可持续发展的有利支持。以洪泽湖为研究区,通过实验比较了阈值法、TM2+TM3>TM4+TM5的谱间关系法、比值法和新型水体指数法提取水体结果的优缺点。研究表明,基于谱间关系构建的新型水体指数法能有效地提取各种类型的水体,且具有很强的普适性。新型水体指数法有效地提高了水体信息提取精度,提取精度高达92.5%。

Extraction of Water Body in Freshwater Lake Wetlands

Timely and accurate acquisition of water body information is crucial to the conservation,utilization and sustainable development of water resources.In this paper,Hongze Lake was taken as the study area.The single-band threshold method,spectral relationship method,simple ratio method,and a new water index were applied respectively to information extraction of water body.The results of information extraction by using the four methods were compared.The results show that spectral relationship method can extract various water bodies and eliminate classification errors caused by shadows from the built-up.The new water index can reduce the misclassification and achieve a higher accuracy of water body extraction effectively.The overall accuracy of extraction of water bodies is 92.5%.