面向浑浊二类水体的哨兵2A卫星大气校正效果分析  

Analysis of atmospheric correction effectof Sentinel-2A on inland case l turbid water

作　　者：严飞 顾雷霆 Yan Feil;Gu Leiting(Wuxi environmental monitoring center of Jiangsu Province,Wui Jiangsu 214000 Xin Wu environmental monitoring center,WuXi,Jiangsu 21400)

机构地区：[1]江苏省无锡环境监测中心,江苏无锡214000 [2]新吴区环境监测中心,江苏无锡214000

出　　处：《污染防治技术》2021年第4期15-19,共5页Pollution Control Technology

摘　　要：为评价哨兵2A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2017年7月28日哨兵2A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COCI数据大气校正结果的协同比对,验证哨兵2A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,蓝光的Bl和B波段校正精度最高,MAPE分别(Mean Absolute Percentage Error,即平均绝对误差)为14.05%和12.30%;红边B波段校正精度次高,MAPE为27.56%;绿光B波段和红光B波段校正精度次低,MAPE分别为34.79%和35.90%;红边B6和近红外B8波段校正精度最低,MAPE分别为50.14%和57.22%。其中Bl和B2波段校正精度高于COCI,主要原因在于哨兵2A的空间分辨率远高于COCI,混合像元导致的精度误差相对较小;而B3,B4,B5,B6和B8波段低于COCI,表明哨兵2A较传统的水色遥感卫星没有优势,但仍在可接受的范围内,在水色遥感方面有一定的利用价值。总体而言,哨兵2A数据校正精度尚可,可以应用于内陆二类浑浊水体的定量遥感监测。This paper takes the Taihu Lake as study area to evaluate the accuracy of Sentinel-2A derived spectral reflectanceafter atmospheric correction,and aims to provide valuable information for the application of Sentinel-2Adata to water color remotesensing.The MODIS-aided improved CGordon atmospheric correction algorithm was used to conduct atmospheric corection for Sen-tinel-2A images obtained on 2016-07-28.In situ measturements of quasi-synchronous samples and atmospheric corrected COCI(Geostationary Ocean Color Imager)data were used to validate the Sentinel--2A derived spectral reflectance.The results show thatthe correction accuracy of Bl and B2 bands of blue light is the highest,and the MAPE(Mean Absolute Percentage Error)is respec-tively 14.00%and 12.30%.The correction accuracy of the B5 band on the red edge is the second highest,and the MAPE is27.56%.The corection accuracy of the green B3 band and the red B band is the second lowest,and the MAPE is 34.79%and35.90%.The correction accuracy of red-side B6 and near-infrared B8 bands is the lowest,and the MAPE is 50.14%and57.22%.The correction accuracy of Bl and B2 bands is higher than that of COCl,mainly due to the sentry.The spatial resolutionofSentinel-2A is much higher than that of COCI,and the acuracy error caused by mixed pixels is relatively small;while the B3,B4,B5,B,and B8 bands are lower than COC,indicating that Sentinel 2A has no adlvantage over traditional water-colored remotesensing satellies.Within the acceptable range,there is a certain use value in the water color remote sensing.In general,Sentinel 2Adata correction acuracy is acceptable,and can be applied to quantitative remote sensing monitoring of imland turbid water bodlies.

关 键 词：哨兵2A 大气校正 GOCI 太湖 

分 类 号：X823[环境科学与工程—环境工程]