环境减灾-1A卫星超光谱数据反演叶绿素a浓度的模型研究

Study of Retrieving Models for Chlorophyll-a Concentration Based on HJ-1A HIS Image

通过星地同步遥感实验,实测巢湖水体水质参数,运用相关分析探求环境减灾-1A卫星超光谱成像仪数据与实测叶绿素a浓度的关系,选择不同的函数曲线对一阶微分方法、波段比值方法和三波段方法进行拟合,建立相应的估测模型,实现对巢湖水体叶绿素a浓度的反演。并最终选取精度最优的模型模拟巢湖的叶绿素a含量。结果表明:三波段组合的线性模型反演精度最高,67%的检验数据误差小于30%,说明基于环境减灾-1A卫星数据的三波段模型能定量提取巢湖地区夏季水体叶绿素a浓度信息。

Experiment was done in Chaohu Lake when HJ-1 satellite was flying over Chaohu lake. Water quality parameters including chlorophyll-a concentration and total solid suspensions and reflectance of surface water have been measured. To study the eorrelation between HJ-1A HIS data and the concentration of chlorophyll-a, the first-derivative model, band ratio model and threeband model are used to find a best model to retrieve concentration of chlorophyll-a. The result shows that three-band model has the highest accuracy to retrieve concentration of chlorophyll-a, with a relative error of 67% of the validation data less than 30%. Therefore, it can be coneluded that three band model based on the data of HJ-1 HIS image can give quantitative estimate of the concentration of chlorophyll-a in Chaohu lake.