基于GF5高光谱影像水体叶绿素a浓度估算分析——以贵州晴隆光照湖为例

Estimation and Analysis of the Concentration of Water Chlorophyll-a Based on GF5 Hyperspectral Image——Take Qinglong Guangzhao Lake in Guizhou Province as an Example

该文选取贵州晴隆光照湖地区,利用2019年12月25日GF5高光谱遥感监测影像,经波段组合、辐射校正、大气校正等预处理后,在归一化水指数NDWI方法提取光照湖水库水体分布的基础上,利用PIE-Hyp 6.0高光谱影像数据处理软件内置线性回归模型对光照湖水体叶绿素a浓度进行了初步估算分析,光照湖水体叶绿素a浓度均值为1.70 ug/L,98.4%以上小于5.0μg/L,水体环境质量良好。通过对光照湖叶绿素a的初步估算分析,在进一步实测和优化模型参数的基础上,未来可实现对水体环境质量有效的监测,为GF5高光谱数据在贵州省水体环境调查和监管中应用和服务提供参考。

The Qinglong Guangzhao Lake area in Guizhou Province is selected.Using the GF5 hyperspectral remote sensing image on December 25,2019,after preprocessing band combination,radiometric correction,atmospheric correction,the light lake is extracted by the normalized water index.On the basis of extracting the water distribution of Guangzhao Lake reservoir by NDWI method,the chlorophyll-a concentration of Guangzhao lake water was estimated and analyzed by using the established single band model.The avaerage value of chlorophyll-a concentration of Guangzhao lake water was 1.70 ug/L,more than 98.4%was less than 5.0 ug/L,which means the water environment quality is good.Through preliminary estimation and analysis of chlorophyll a in Guangzhao Lake,based on further actual measurement and optimization of model parameters,effective monitoring of water environmental quality can be realized in the future,This paper can be used as reference to the application and service of GF5 hyperspectral data in water environment investigation and supervision in Guizhou Province.