MEaSUREs Annual Greenland Outlet Glacier Terminus Positions from SAR Mosaics, Version 2

This data set, part of the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) program, consists of annual, digitized (polyline) ice front positions for 239 outlet glaciers in Greenland. Ice front positions are derived from Sentinel-1A, Sentinel-1B, and RADARSAT-1 synthetic aperture radar (SAR) mosaics, plus imagery from Landsat 1 through Landsat 5 and Landsat 7 and Landsat 8. Although temporal coverage varies by glacier, data are available for the winter seasons 1972–1973 through 2020–2021. Data are provided as shapefiles. See Greenland Ice Mapping Project (GrIMP) for related data.本数据集隶属于美国国家航空航天局（National Aeronautics and Space Administration，简称NASA）面向研究环境的地球系统数据记录制作项目（Making Earth System Data Records for Use in Research Environments，缩写MEaSUREs），包含格陵兰岛239条外流冰川的年度数字化折线型冰缘位置数据。冰缘位置数据源自Sentinel-1A、Sentinel-1B及RADARSAT-1合成孔径雷达（Synthetic Aperture Radar，缩写SAR）镶嵌影像，同时辅以Landsat 1至Landsat 5、Landsat 7以及Landsat 8的遥感影像。尽管各冰川的时间覆盖范围存在差异，但数据集涵盖了1972-1973至2020-2021年间的冬季时段数据。数据以shapefile格式提供。 相关数据可参考格陵兰冰盖制图项目（Greenland Ice Mapping Project，缩写GrIMP）。