利用MODIS数据进行QuickBird-2卫星海岸带图像大气校正研究

大气校正是遥感信息定量化过程的一个重要环节,而在大气校正中起关键作用的是气溶胶光学厚度,气溶胶的模式和大气漫射透过率;但在浑浊的水体上空,这些参量很难用卫星图像反演得到,从而提出了基于同步MODIS数据辅助QuickBird-2卫星图像进行海岸带大气校正算法,该方法由MODIS图像的水体像元反演出混浊水域上空气溶胶光学特性,与MODIS气溶胶产品相比相对误差小于10%;同时,借助6S辐射传输模型,并考虑了高分辨率图像临近像元效应,对QuickBird-2卫星海岸带图像进行大气校正.给出了我国沿海地区QuickBird-2卫星图像大气校正的结果,并对反演误差进行了分析.

Atmospheric Correction of QuickBird-2 Imagery for Turbid Water Coastal Areas Using MODIS Data

Atmospheric correction is an important part of the Quantitative Remote Sensing, and the most important key for atmospheric correction is Aerosol retrieval including Aerosol optical depth, Aerosol type and atmospheric diffuse transmission. But to retrieve the aerosol optical character over the turbid waters is difficult by using satellite image itself. So we advanced an atmospheric correction algorithm of QuickBird-2 imagery for turbid water coastal areas using synchronous measuring MODIS data. This algorithm is to retrieve the atmospheric properties of turbid water coastal areas based on MODIS water pixel. The relative error between the retrieval result and the MODIS aerosol product is less then 10%. On the other hand, by using the 6s Radiation Transfer Model and taking account of the adjacency effect for high spatial resolution imagery, Atmospheric correction has been applied to QuickBird-2 imagery for turbid water coastal areas. The atmospheric correction results and the analysis of retrieval errors have been given.