SEVI指数消除4种十米级空间分辨率卫星影像地形阴影影响的效果评价  

Performance Evaluation of Topographic Correction for Four Spatial Resolution Images by the Shadow-Eliminated Vegetation Index(SEVI)

作　　者：马锦典 江洪[1] Ma Jindian;Jiang Hong(Key Laboratory of Spatial Data Mining&Information Sharing of MOE,National&Local Joint Engineering Research Center of Satellite Geospatial Information Technology,Academy of Digital China(Fujian),Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学空间数据挖掘与信息共享教育部重点实验室,卫星空间信息技术综合应用国家地方联合工程研究中心,数字中国研究院(福建),福建福州350108

出　　处：《遥感技术与应用》2021年第5期1100-1110,共11页Remote Sensing Technology and Application

基　　金：福建省自然科学基金项目(2017J01658);国家重点研发计划项目子课题(2017YFB0504203)。

摘　　要：为评价阴影消除植被指数(Shadow-Eliminated Vegetation Index,SEVI)对常用十米级不同空间分辨率遥感影像的地形阴影消除效果,采用2019年1月24~25日过境的Sentinel S2B(10 m)、GF-1(16 m)、Landsat 8 OLI(30 m)、GF-4(50 m)4种空间分辨率多光谱影像,计算了基于地表反射率的NDVI、SEVI和基于SCS+C模型校正后反射率的NDVI。评价方法包括植被指数数值分析、本影和落影相对误差分析、变异系数分析、植被指数与太阳入射角余弦值(cosi)散点图分析等。评价结果显示:4种空间分辨率的SEVI在本影相对误差分别为2.172%、1.422%、1.351%、1.060%;对应落影的相对误差分别为2.598%、2.801%、3.795%、2.711%;相应SEVI与cosi的决定系数分别为0.0173、0.0107、0.0011、0.0001;相应变异系数分别为10.036%、9.070%、8.051%、1.631%。研究结果表明,SEVI对10~50 m不同空间分辨率遥感影像的地形阴影校正效果良好,优于用SCS+C模型校正后的地表反射率计算的NDVI;遥感影像的地形阴影效应随着空间分辨率降低而减弱。In order to evaluate the elimination performance of topographic shadow effect by the Shadow-Elimi⁃nated Vegetation Index(SEVI),four multispectral images of the Sentinel S2B(10 m),GF-1(16 m),Land⁃sat 8 OLI(30 m)and GF-4(50 m)were used to study.The Normalized Difference Vegetation Index(NDVI)calculated from the surface reflectance and sun-canopy-sensor(SCS)+C correction was used to compare with SEVI calculated from the surface reflectance data.The evaluation methods included the vegetation indices value analysis,absolute relative error analysis,Coefficient of Variation(CV)analysis and scatter plots analysis of the cosine of solar incidence angle(cosi)versus vegetation indices.The result shows that the relative errors over the self shadow are 2.172%,1.422%,1.351%,1.060%respectively for the SEVI calculated from four spatial resolution images.Meanwhile,the relative errors over the cast shadow are 2.598%,2.801%,3.795%,2.711%respectively.The coefficients of determination of cosi versus SEVI are 0.0173,0.0107,0.0011,0.0001 respectively.and the coefficients of variation are 10.036%,9.070%,8.051%,1.631%respectively.The SEVI eliminated the topographic shadow effect drastically of these four remote sensing images,which is better than the NDVI after the SCS+C correction.What is more,the topographic shadow effect is weaken as the spatial resolution of image is becoming lower.

关 键 词：阴影消除植被指数(SEVI) 本影 落影 SCS+C 空间分辨率 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]