摘要
利用射阳河口实测光谱及模拟Hyperion光谱数据与表层水体无机氮磷营养盐浓度进行相关性分析,以及氮磷与悬沙浓度的光谱相关性分析,构建定量模型,实现了射阳河口水体无机氮磷浓度的定量反演。结果表明:现场实测光谱反射率与氮、磷浓度以及悬沙浓度间的相关性具有很强的相似性,相关系数曲线的变化趋势几乎完全一致。对Hyperion的各波段与896nm间进行了9种波段组合与氮磷浓度进行相关性分析,相关系数最大的因子为中心波长为428nm波段与896nm波段光谱反射率的归一化差值指数因子(F3(428,896)),分别为0.80与0.79。以F3(428,896)因子构建线性模型,模型检验的相对RMSE分别为36.63%和47.33%,反映了模型具有良好的预测精度。同时,模型充分显示了河口氮磷含量与悬沙浓度的高度相关性以及氮磷含量本身的高相关性。
In this study,the correlations between experimental hyperspectral data or hyperion reflectance and total inorganic nitrogen（TIN）,total inorganic phosphorus（TIP） concentration,as well as the relationship between TIN,TIP and suspended sediment concentration（SSC）,were analyzed to establish the quantitative models on TIN and TIP concentration in Sheyang estuary.The results showed that：the relationship between measured spectral reflectance and TIN,TIP,SSC were performed strong similarity with almost identical trends of correlation curve.Nine combinations of Hyperion bands with band 896nm were used to analyze the correlations to TIN and TIP concentration,and the largest correlations were centered on the pseudo-NDVI factor of F3（428,896） with the values of 0.80 and 0.79.The validation of linear models gives a good simulation precision with relative RMSE values as 36.63% and 47.33% for TIN and TIP,respectively.The models further represented strong correlations among TIN,TIP and SSC,and the TIN,TIP distribution patterns in Sheyang estuary could be summarized as：gradual reduction in the TIN and TIP from the shore to the open sea and a higher TIN and TIP concentration observed in the southern shore than the north.The patterns were also excellently uniform with the SSC distribution conditions.
出处
《遥感信息》
CSCD
2011年第3期88-93,共6页
Remote Sensing Information
基金
国家自然科学基金资助项目(40606044)
国家近海洋综合调查与评价专项资助项目(JS-908-01-05)
高等学校博士学科点专项科研基金(项目编号:200803190007)
关键词
射阳河口
氮磷浓度
HYPERION影像
线性模型
反演
Sheyang estuary
inorganic nitrogen and phosphorus concentration
hyperion image
linear model
quantification
