太湖水域叶绿素a浓度的遥感反演研究

Study on Retrieval of Chlorophyll-a Concentration by Remote Sensing in Taihu Lake

利用太湖水域MODIS遥感数据的各波段反射率组合计算值,与实测的叶绿素a浓度进行相关性分析,找到相关性最好的反射率组合,建立反演太湖叶绿素a浓度的遥感模型。结果表明,利用MODIS数据可以较好地实现对太湖水域叶绿素a浓度的定量反演计算,并以MODIS数据第3、第17波段的反射率组合作为遥感指数建立了反演叶绿素a浓度的模型。第3、第17波段的波长范围分别为459nm～479nm、890nm～920nm,这一波段选择与以往使用TM数据得到的结论有所不同。

Using MODIS remote sensing data in Taihu Lake, calculate the indices of reflectivity in different wave band combination, and compared with chlorophyll - a concentration measurements by correlation analysis. Then, find the best reflectivity combination in correlation to build the model of retrieval of chlorophyll - a concentration in Taihu Lake. The result show that MODIS image data is preferably useful in quantitative retrieval model of chlorophyll - a concentration in Talhu Lake. And use the reflectivity combination of band3 and bandl7 （R＇,7 -R＇3 ）/（ R＇3 ＋ R＇,7 ） as the index to retrieve chlorophylla concentration. The wave bands of band3 and bandl7 are 459nm - 479nm and 890nm -920nm which belong to the near - infrared band and blue band, which bands we chose are different from the conclusion based by TM data.