长时序Landsat数据辐射校正方法对比研究  

Comparative Study on the Radiometric Correction Methods of Long Time-series Landsat Data

作　　者：邓琳 胡勇[1,2] 黄健 李婷婷 DENG Lin;HU Yong;HUANG Jian;LI Tingting(Chongqing Institute of Surveying and Planning for Land Resources and Housing,Chongqing 400020,China;Chongqing Engineering Research Center of Land Use and Remote-sense Monitoring,Chongqing 400020,China)

机构地区：[1]重庆市国土资源和房屋勘测规划院,重庆400020 [2]重庆市土地利用与遥感监测工程技术研究中心,重庆400020

出　　处：《航天返回与遥感》2018年第5期104-112,共9页Spacecraft Recovery & Remote Sensing

基　　金：住房和城乡建设部科技项目(2016-k8-054)

摘　　要：Landsat数据以其存档时间长、辐射性能稳定、全球免费获取等优势,被广泛应用于时序定量遥感监测研究。但长时序的遥感数据必须经过辐射校正获得地表反射率后,才能应用统一的模型或分类规则进行地表变化监测。文章以重庆地区2001年到2009年的5景Landsat数据为数据源,分别采用基于MODIS大气产品和6S辐射传输模型的逐像素大气校正方法和基于多元变化检测的相对辐射校正方法反演了地表反射率,并采用目视解译、影像直方图和时序未变化像元统计,对上述两种辐射校正结果进行了对比分析。结果表明:两种校正方法均能有效反演时序Landsat数据的地表反射率,消除时序影像的地物色彩差异,且时序未变像元点的反射率光谱一致性较好。大气校正能够消除可见光波段的大气空间异质性影响,使反演结果在时间序列上具有更高的稳定性和精度。Landsat data have always been used in time series quantitative remote sensing applications,because of the advantages of long time storage,stable radiation and free mode.However,the radiometric correction procedure used to remove the atmosphere effects is necessary as a critical preprocessing step before monitoring the surface change.In this study,taking five sets of Landsat data in Chongqing city from 2001 to 2009 as the data source,the radiometric correction results obtained by two different procedures are compared.One method is the per-pixel atmospheric correction based on MODIS(Moderate-resolution Imaging Spectror-adiometer)atmospheric characterization products and the 6S(Second Simulation of a Satellite Signal in the Solar Spectrum)radiative transfer algorithm,and the other is the radiometric normalization based on MAD(Multivariate Alteration Detection)transformation.Then visual interpretation,images histogram and invariant pixels are employed to compare and evaluate the atmospheric correction results on time-series images.The results show that the two methods are effective in inversing the surface reflectance from time-series images and removing the impact of atmosphere,and the surface reflectances retrieved by the two methods are consistent for invariant pixels.It should be noted that because the atmospheric correction methods can remove the effects of spatial heterogeneity in atmospheric conditions,the surface reflectance has higher stability and accuracy for time-series images.

关 键 词：长时序数据 相对辐射校正 大气校正 辐射校正 卫星遥感应用 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]