珠江三角洲地区FY-3卫星MERSI影像的大气校正方法研究  

Study on atmospheric correction methods for FY-3 MERSI image over Pearl River Delta region

作　　者：张月维 何全军[1,2] 黄江[1,2] 

机构地区：[1]广州气象卫星地面站,广东广州510640 [2]中国气象局/广东省区域数值天气预报重点实验室,广东广州510080

出　　处：《气象与环境学报》2015年第2期15-20,共6页Journal of Meteorology and Environment

基　　金：公益性行业(气象)科研专项(201306081);广东省气象局科学技术研究项目(2011B08)共同资助

摘　　要：利用广东省86个气象站的观测数据为大气校正简化算法(Simplify Method for Atmospheric Correction,SMAC)提供校正参数,对中分辨率光谱成像仪(Medium Resolution Spectral Imager,MERSI)的250 m分辨率数据进行了大气校正处理研究。通过对各波段反射率直方图、归一化植被指数(Normalized Difference Vegetable Index,NDVI)直方图及气象站反射率的分布特征进行分析,检验SMAC算法进行MERSI数据大气校正的效果。结果表明:大气校正后MERSI各波段反射率区间变宽,站点反射率更接近实际,校正后的NDVI直方图曲线较平滑,NDVI峰值向高值移动,临近日期的NDVI直方图曲线更相近,说明本文采用的大气校正处理方法可得到合理的结果。Observed data from 86 weather stations in Guangdong province were used to provide parameters of a simplify method for atmospheric correction（SMAC）algorithm,and then the SMAC algorithm was employed to conduct atmospheric correction for 250 m resolution data from medium resolution spectral imager（MERSI）.In or-der to validate effects of SMAC algorithm for MERSI data,the reflectance histogram of each band and the normal-ized difference vegetation index（NDVI）before and after atmospheric correction were compared,and the reflectivi-ty distribution characteristics in each meteorological station were analyzed.The results show that the reflectance in-terval of each band becomes wider and the reflectivity in the meteorological station is closer to the observation after atmospheric correction.Also,the histograms of NDVI are smoother and the peaks are higher after atmospheric cor-rection;the histograms of NDVI are more similar for the data with time closer.All these results suggest that this at-mospheric correction method is reasonable.

关 键 词：大气校正 FY-3卫星 中分辨率光谱成像仪 归一化植被指数 

分 类 号：P414.4[天文地球—大气科学及气象学] TP751[自动化与计算机技术—检测技术与自动化装置]