北京师范大学学报（自然科学版）2017，Vol.53Issue(2)：187-193,7.DOI:10.16360/j.cnki.jbnuns.2017.02.013
南极地区Landsat8卫星影像的阴影检测方法
Shadow detection in Antarctica using Landsat8 satellite images
摘要
Abstract
Shadows present in optical remote sensing images will influence land surface information extraction and analysis.Such shadows are the result of ups and downs in the terrain and cannot be ignored especially in Antarctica located in high latitude with rather low solar elevation.Referring to existing shadow detection studies,the reflectance characteristics of shadows in Landsat8 images were analyzed for building a new method.DN values were converted to Top of Atmosphere (TOA) reflectance,and shadow detection index R51 were defined using band1 Coastal/Aerosol(0.43 ～ 0.45 μm) and band5 NIR (0.85 ～ 0.88 μm);the threshold due to statistical analysis of training samples was used for differentiating shadow pixels with snow,blue ice and exposed rocks.Several images in different regions of Antarctica were used for accuracy assessment and the results suggested this method could be used for shadow detection of Landsat8 images in Antarctica with high accuracy.In addition,this method were applied for 1 127 Landsat8 images of the whole Antarctica continent,and the extraction shadow areas were nearly 15 000 km2,most of which existed in rock areas and large glaciers regions.关键词
南极/阴影检测法/Landsat8/反射率/阈值提取/遥感多波段Key words
Antarctica/shadow detection/Landsat8/reflectance/threshold extraction/remote sensing multispectral分类
天文与地球科学引用本文复制引用
康婧,程晓,刘岩,惠凤鸣,欧阳伦曦,李田..南极地区Landsat8卫星影像的阴影检测方法[J].北京师范大学学报（自然科学版）,2017,53(2):187-193,7.基金项目
国家重点基础研究发展计划资助项目(2012CB957704) （2012CB957704）
