基于不同开源DEM的地形校正模型应用对比研究  

A Comparative Research on the Application of Terrain Correction Models Based on Different Open Source DEMs

作　　者：李旭 王志慧[2,3] 李春意 刘杨[2] 马力 LI Xu;WANG Zhihui;LI Chunyi;LIU Yang;MA Li(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454003;Yellow River Institute of Hydraulic Research,Yellow River Conservancy Commission of the Ministry of Water Resources,Zhengzhou 450003;Key Laboratory of Soil and Water Conservation on the Loess Plateau,Zhengzhou 450003,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454003 [2]黄河水利委员会黄河水利科学研究院,河南郑州450003 [3]水利部黄土高原水土保持重点实验室,河南郑州450003

出　　处：《地理与地理信息科学》2023年第5期22-29,共8页Geography and Geo-Information Science

基　　金：国家自然科学基金黄河水科学研究联合基金项目(U2243212);中央级科学事业基本科研业务费专项(HKY-JBYW-2022-13);黄委优秀青年人才科技项目(HQK-202307);水利部重大科技项目(SKR-2022017)。

摘　　要：复杂地形严重影响光学卫星遥感在山区的定量化应用精度,基于开源DEM的半经验地形校正模型是消除遥感观测地形效应的常用方法,然而对不同开源DEM和不同校正模型的最佳组合方式仍缺乏研究。该文以黄土丘陵区为例,基于Landsat8 OLI影像,使用3种开源DEM(AW3D、SRTM、GDEM)和4种地形校正模型(C模型、SCS+C模型、SE模型、MIN模型)开展地形校正试验,并通过构建地形校正效果评价指标,对由太阳局地入射角引起的光谱异常、坡向引起的光谱异常和同地类光谱变异性的校正效果进行定量评估。结果表明:基于不同开源DEM产品的综合地形校正效果排序为AW3D>SRTM>GDEM,基于AW3D产品的地形校正能最精细刻画遥感影像地表反射率对局地太阳入射角变化的响应规律;所有开源DEM和校正模型组合试验中,AW3D产品和SE校正模型组合的地形校正效果最佳,对太阳局地入射角引起的光谱异常、坡向引起的光谱异常和同地类光谱异常的减少幅度分别为98.2%、38.8%和97.4%。研究成果可为黄土丘陵区遥感影像地形校正提供参考。The quantitative application accuracy of optical satellite remote sensing in mountainous areas is seriously affected by complex terrain.The semi-empirical terrain correction model based on open source DEM is a common method to eliminate the terrain effect of remote sensing observation.However,the optimal combination of different open source DEMs and different correction models is still lacking.Therefore,this paper takes the loess hilly region as an example.Based on Landsat8 OLI images,three open source DEMs(AW3D,SRTM,GDEM)and four terrain correction models(C model,SCS+C model,SE model,MIN model)were used to carry out topographic correction experiments.By constructing the evaluation indexes of topographic correction effect,the correction effect of spectral anomaly caused by local solar incidence angle and aspect and spectral variability of the same land type was quantitatively evaluated.The results show that the order of comprehensive topographic correction effects based on different open source DEM products is AW3D>SRTM>GDEM.Compared with SRTM and GDEM products,topographic correction based on AW3D products can best describe the response of surface reflectance of remote sensing images to the change of local solar incidence angle.Among all the combination experiments of open source DEMs and correction models,the combination of AW3D and SE correction model has the best topographic correction effect.This combination method reduces the spectral anomaly caused by the local solar incidence angle and aspect and the spectral variability of the same land type by 98.2%,38.8%and 97.4%,respectively.The research results can provide data and method reference for topographic correction of remote sensing image in loess hilly region.

关 键 词：地形效应 地形校正 开源DEM 地表反射率 黄土丘陵区 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]