淀山湖微量水质参数卫星高光谱遥感估算

Estimation for Water Quality Parameters in Dianshan Lake Based on HJ-1A HSI Image

水质参数总磷、总氮、溶解氧、高锰酸盐指数、pH等是表征湖泊水质的重要指标,利用遥感技术可对其进行大范围定量监测,掌握水质参数的实时变化动态.以淀山湖为研究对象,利用HJ-1A卫星HSI高光谱遥感数据,分析了这些水质指标与单波段反射率、不同波段之间反射率的比值以及不同波段之间反射率的差值之间的相关关系,给出最佳波段组合.建立了9个水质参数与水体光谱反射率之间的估算模型,并对淀山湖水体的9项主要水质参数进行估算,可为基于HJ-1A卫星的水环境业务化监测提供借鉴.

Water parameters like total nitrogen, total phosphorus, dissolved oxygen, permanganate index, and pH are important water quality indicators of the inland lakes. Remote sensing, with a wide ranges and real-time dynamics ability, has great potential in water environment monitoring. The Dianshan Lake in Shanghai city was selected as the study area. Based on the in-situ sampling data, first the correlations between water parameters and the value of single band reflectance, bands ratio, and bands difference were analyzed respectively. Then, the estimation models of nine water quality parameters were established with the optimized band-combination of HJ-1A hyperspectral （HSI） satellite data. And finally, we obtained the spatial distribution of 9 kinds of water quality parameters in Dianshan Lake. The method will provide a foundation and reference for the future study of water quality routine monitoring with HJ-1A satellite data.