A new image mosaic of Greenland using Landsat-8 OLI images  

全新的Landsat-8 OLI格陵兰遥感影像图

作　　者：Zhuoqi Chen Zhaohui Chi Karl B.Zinglersen Ying Tian Kaijia Wang Fengming Hui Xiao Cheng 陈卓奇;迟肇惠;Karl B.Zinglersen;田颖;王凯加;惠凤鸣;程晓(School of Geospatial Engineering and Science,Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China;College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China;University Corporation for Polar Research,Beijing 100875,China;Department of Geography,Texas A&M University,College Station,TX 77843,USA;Greenland Institute of Natural Resources,Nuuk,Greenland 5703900,Denmark)

机构地区：[1]School of Geospatial Engineering and Science,Sun Yat-sen University&Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China [2]College of Global Change and Earth System Science,Beijing Normal University,Beijing 100875,China [3]University Corporation for Polar Research,Beijing 100875,China [4]Department of Geography,Texas A&M University,College Station,TX 77843,USA [5]Greenland Institute of Natural Resources,Nuuk,Greenland 5703900,Denmark

出　　处：《Science Bulletin》2020年第7期522-524,M0003,共4页科学通报（英文版）

基　　金：This work was supported by the National Key Research and Development Program of China(2018YFC1406101);the National Natural Science Foundation of China(41571338).

摘　　要：Greenland is the world’s largest island and over three-quarter of the entire land area is covered by the Greenland Ice Sheet(GrIS),which is the only permanent ice sheet besides Antarctica.Due to the global warming,GrIS is undergoing rapid changes[1,2],which has caused some environmental risks for the life of local people of Greenland.Greenland mass balance has been studied for several decades and we understand some its mass balance mechanism[3].However,the mechanism of GrIS changes is still unclear due to the lack of research data for Greenland.A satellite image mosaic is an important type of research data for Greenland studies.It can record the changes of land surface features with a relatively fine spatial resolution and support a variety of scientific researches in Greenland,such as supraglacial streams,rivers and lakes monitoring,mass balance estimation and land cover classification[4–6].The first Landsat Image Mosaic of Greenland(LIMG-GIMP)was released in 2014 by the Greenland Ice Mapping Project[7].The satellite images used to develop LIMG-GIMP were acquired between 1999 and 2002,which cannot represent recent GrIS status.Therefore,a new mosaic constructed by recent data is needed to monitor these changes of GrIS for future studies of Greenland.格陵兰是世界上最大的岛屿, 2/3的国土面积被冰雪覆盖.在全球气候变化的背景下,格陵兰冰盖正在加速融化和流失.为了定量化研究格陵兰冰盖消融的速度及其对全球海平面上升的贡献,格陵兰地区高分辨率遥感影像图是必不可少的研究数据.目前唯一的一套高分辨率格陵兰遥感影像图(LIMG)是由GIMP项目发布的,该数据采用1999~2002年的Landsat 7和Radarsat 1影像拼接完成.由于该数据集过于陈旧,各国研究者迫切需要最新的格陵兰高分辨率遥感影像图开展相关研究.本文在收集2014~2015年229景Landsat 8遥感影像数据的基础上,提出了分段聚类拉伸和最大信息熵自动去云算法,克服了冰雪与裸露地表反射率反差巨大,不同时间获取的卫星图像色差巨大等技术难点,成功绘制了格陵兰岛全岛卫星图像(2014~2015年).目前,该数据集可在http://earth.bnu.edu.cn/greenland Mosaic免费下载.

关 键 词：高分辨率遥感影像 免费下载 遥感影像图 格陵兰冰盖 MOSAIC 影像拼接 卫星图像 最大信息熵 

分 类 号：P237[天文地球—摄影测量与遥感]