光谱学与光谱分析, 2011, 31 (10): 2798, 网络出版: 2011-11-09
基于辐射传输模型的环境一号卫星CCD相机的水体大气校正方法研究
Atmospheric Correction Method for HJ-1 CCD Imagery over Waters Based on Radiative Transfer Model
水体大气校正 环境一号卫星CCD相机 离水反射率 遥感反射比 Water atmospheric correction HJ-1 CCD camera Water leaving reflectance Remote sensing reflectance
摘要
水体大气校正问题是开展我国环境一号卫星水色遥感定量化应用的关键。 针对环境卫星CCD相机的特点, 以水气耦合的辐射传输模型构建大气校正参数查找表, 研究以地面气象数据辅助的逐像元水体大气校正方法, 实现水体离水反射率和遥感反射比的反演。 以现场测量数据和MODIS数据为参考进行水体大气校正效果验证, 研究发现CCD相机的反演结果在蓝、 绿波段的精度较高而红、 近红的反演结果系统偏大。 研究结果还表明气溶胶模型是影响水体大气校正精度的重要因素。
Abstract
Atmospheric correction is a bottleneck in quantitative application of Chinese satellites HJ-1 data to remote sensing of water color. According to the characteristics of CCD sensors, the present paper made use of air-water coupled radiative transfer model to work out the look-up table (LUT) of atmospheric corrected parameters, and thereafter developed pixel-by-pixel atmospheric correction method over waters accomplishing the water-leaving remote sensing reflectance with accessorial meteorological input. The paper validates the HJ-1 CCD retrievals with MODIS and in-situ results. It was found that the accuracy in blue and green bands is good. However, the accuracy in red or NIR bands is much worse than blue or green ones. It was also demonstrated that the aerosol model is a sensitive factor to the atmospheric correction accuracy.
许华, 顾行发, 李正强, 李莉, 陈兴峰. 基于辐射传输模型的环境一号卫星CCD相机的水体大气校正方法研究[J]. 光谱学与光谱分析, 2011, 31(10): 2798. XU Hua, GU Xing-fa, LI Zheng-qiang, LI Li, CHEN Xing-feng. Atmospheric Correction Method for HJ-1 CCD Imagery over Waters Based on Radiative Transfer Model[J]. Spectroscopy and Spectral Analysis, 2011, 31(10): 2798.