浑浊二类水体的高分四号卫星大气校正效果分析  

Performance Assessment of Atmospheric Correction for Multispectral Data of GF-4 on Inland Case Ⅱ Turbid Water

作　　者：宋挺[1,2] 龚绍琦 刘军志[4,5] 顾征帆[2] 石浚哲 吴蔚 SONG Ting;GONG Shao-qi;LIU Jun-zhi;GU Zheng-fan;SHI Jun-zhe;WU Wei(School of Environmental Science and Engineering,Nanjing Universityof Information Science&Technology,Nanjing　210044,China;Wuxi Environmental Monitoring Centre,Wuxi　214121,China;School of Geography and Remote Sensing,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Virtual Geographic Environment,Ministry of Education,Nanjing Normal University,Nanjing　210023,China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing　210023,China)

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏南京210044 [2]无锡市环境监测中心站,江苏无锡214121 [3]南京信息工程大学地理与遥感学院,江苏南京210044 [4]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023 [5]江苏省地理信息资源开发与利用协同创新中心,江苏南京210023

出　　处：《光谱学与光谱分析》2018年第4期1191-1197,共7页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(41601413);国家科技重大专项子课题(2012ZX07506-002);江苏省自然科学基金项目(BK20150975)资助

摘　　要：高分四号卫星是我国首颗高空间分辨率地球静止卫星,在浑浊二类水体的遥感定量监测方面应用潜力很大。为评价高分四号多光谱数据经大气校正后水体反射率的精度,以太湖为研究区,使用同步MODIS数据辅助的Gordon单次散射改进算法,对2016年7月21日和2016年8月17日两景高分四号多光谱数据进行大气校正,并通过与地面同步实测光谱数据、以及地球静止水色卫星GOCI数据大气校正结果的协同比对,验证高分四号多光谱数据的大气校正效果,为该卫星产品的水色遥感应用提供借鉴和参考。结果表明,红光B4波段校正精度最高,平均绝对误差(MAPE)为10.71%;绿光B3波段校正精度次高,MAPE为13.21%;近红外B5波段校正精度次低,MAPE为33.06%;蓝光B2波段校正精度最低,MAPE为53.55%。其中B3,B4和B5波段校正精度高于GOCI,主要原因在于高分四号的空间分辨率远高于GOCI,混合像元导致的精度误差相对较小,充分显示了高分四号作为一颗高空间分辨率地球静止卫星在水色遥感方面的优势;而B2波段低于GOCI,表明高分四号的蓝光波段尚有改进空间,今后有必要对该波段进行重新定标等处理;在未得到有效处理的情况下,水色遥感应用应尽量避开该波段。总体而言,高分四号多光谱数据校正精度较高,可以较好的应用于内陆二类浑浊水体的定量遥感监测。GF-4 satellite is the first geostationary satellite with high spatial resolution in China,which has great potential in the aspects of inland water monitoring.This paper takes the Taihu Lake as study area to evaluate the accuracy of GF-4derived spectral reflectance after atmospheric correction,aiming to provide valuable information for the application of GF-4 data to water color remote sensing.The MODIS-aided improved Gordon atmospheric correction algorithm was used to conduct atmospheric correction for GF-4 images obtained on 2016-07-21 and 2016-08-17.In situ measurements of quasi-synchronous samples and atmospheric corrected GOCI(Geostationary Ocean Color Imager)data were used to validate the GF-4 derived spectral reflectance.The results show that the red-lightB4 band had the highest accuracy with RMSE(Root Mean Square Error)of 1.25×10-3 and MAPE(Mean Absolute Percentage Error)of 10.71%,the green-lightB3 band had RMSE of 2.43×10-3 and MAPE of 13.21%,and the near-infrared B5 band had RMSE of 1.95×10-3 and MAPE of 33.06%.The blue-lightB2 band had the worst accuracy with RMSE of 6.81×10-3 and MAPE of 53.55%.The accuracy of B3,B4 and B5 bands of GF-4 were higher than those of GOCI.This is because that the spatial resolution of GF-4 is much higher than that of GOCI,so the errors caused by mixed pixel were relatively smaller,showing the advantage of GF-4 as a high-resolution geostationary satellite when used in water color remote sensing.The accuracy of B2 band of GF-4 was lower than that of GOCI,indicating the B2 band of GF-4 still has room for improvement.In the future,the B2 band should be corrected separately,and the usage ofthis band in water color remote sensing should be avoided if it is not corrected properly.Overall,the multispectral data of GF-4 has relatively high accuracy and can used to monitor the inland case II turbidwater.In order to improvethe accuracy of GF-4 derived spectral reflectance,several researches shouldbe conducted in the future.First,aerosol observation stations should be established t

关 键 词：高分四号 大气校正 GOCI 太湖 

分 类 号：X52[环境科学与工程—环境工程]