基于Sentinel-2影像的鄱阳湖大气校正方法适用性评价  

Evaluation of Atmospheric Correction Methods for Sentinel-2 Image-A Case Study of Poyang Lake

作　　者：李海翠 况润元[1] 宋子豪 LI Haicui;KUANG Runyuan;SONG Zihao(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学土木与测绘工程学院,赣州341000

出　　处：《航天返回与遥感》2021年第4期108-119,共12页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金资助项目(41101322);江西省教育厅科学技术项目(GJJ160617);江西省研究生创新专项资金项目(YC2020-S454)。

摘　　要：随着水色遥感技术逐步应用于内陆浑浊水体,大气校正成为水色遥感中最关键的一步。文章以“哨兵二号”卫星(Sentinel-2)数据为基础,采用Sen2cor、6S、FLAASH、ACOLITE和QUAC五种大气校正方法对鄱阳湖水体进行大气校正研究,结合实测水体反射率对不同校正结果进行精度验证分析。从整体对比结果来看,经过校正后的反射率曲线与实测光谱曲线的变化趋势基本一致,具有较高的拟合度,其中Sen2cor方法整体精度最高,依次是FLAASH、6S、ACOLITE和QUAC。对比单波段校正精度,Sen2cor在490nm和560nm波段表现最好,在665nm和705nm波段,6S、ACOLITE和Sen2cor效果较好,平均相对误差均在13%以内,而在842nm和865nm波段,除FLAASH算法表现相对较好以外,其他四种方法表现均较差,其中QUAC算法在所有波段的校正效果表现最差。结果表明,这五种大气校正方法均使水体影像品质得到了提高,增加了可用性,该结果可为其他类似Ⅱ类水体大气校正研究提供参考。Based on Sentinel-2 MSI data,five atmospheric correction methods,namely Sen2cor,ACOLITE,6S model,FLAASH and QUAC,were used to study the atmospheric correction of Poyang Lake water.The accuracy of different correction results were verified and analyzed by combining the measured water reflectance.From the overall comparison results,the variation trend of the corrected reflectivity curve and the measured spectral curve was consistent,which has a good fit.Among this,Sen2cor method has the highest overall accuracy,with a determination coefficient R2 of 0.97 and an average relative error of 29.37%,followed by FLAASH,6S model,ACOLITE and QUAC.Contrast single band correction accuracy,Sen2cor in 490nm and 560nm band performed best,an average relative error of 8.90%and 9.15%respectively.In 665nm and 705nm band,6s model,ACOLITE and Sen2cor effect is better,the average relative error is within 13%.And in 842nm and 865nm band,FLAASH algorithm performance is relatively good,the other four methods are poor performance.QUAC algorithm has the worst correction effect in all bands.The results show that these five atmospheric correction methods can improve the image quality and enhance the usability of water images,The results can be used as Poyang lake and other similar types of water body,and provides a effective reference for atmospheric correction research.

关 键 词：遥感反射率 大气校正 辐射传输模型 鄱阳湖 “哨兵二号”卫星 遥感应用 

分 类 号：P237[天文地球—摄影测量与遥感]