MODIS影像监测海州湾叶绿素a浓度的研究

Researching on Monitoring the Concentration of Chlorophyll-a by Using MODIS Data in Haizhou Gulf

利用海州湾海域2004～2006年的水质监测资料，选择同期成像质量良好的MODIS Terra 1B影像，分别在单波段因子和波段组合与叶绿素a浓度之间进行相关分析，发现近红外波段和绿波段、红波段的比值因子、差值因子以及仿植被指数因子与叶绿素a浓度相关性较高。用这些因子建立叶绿素a浓度的回归模型，其中因子FT（24）的二次多项式模型的R^2达到0．801．平均相对精度达到65％以上，且模型具有较高的泛化能力，不仅证明了利用MODIS1B影像监测海面叶绿素a浓度的可行性，而且对于监测该海域赤潮和富营养化状况具有重要的现实意义。

This paper used the observation data of the concentration of chlorophyll - a in Haizhou Gulf from 2004 to 2006 and selects synchronous MODIS Terra 1B data. We established factors with single band and multibands and calculated correlations between each factor and the concentration of chlorophyll - a. The results shows that the ratio factors, difference factors and imitated NDVI factors with near infrared bands and green or red band have strong correlation with the concentration of chlorophyll - a. The regression models are established with these factors and the model with factor F7/24） has the maximum R2 （0.801） and relative accuracy （ 〉 65% ） among them. The results prove the validity of monitoring the concentration of chlorophyll - a by MODIS 1B Data in offshore of Jiangsu Province.