Making Earth System Data Records for Use in Research Environments (MEaSUREs) Greenland Ice Sheet Velocity Map from Interferometric Synthetic Aperture Radar (InSAR) Data, Version 2, 2000-2018

This data set, part of the National Aeronautics and Space Administration (NASA) Making Earth System Data Records for Use in Research Environments (MEaSUREs) program, contains seasonal (winter) ice sheet-wide velocity maps for Greenland. The maps are derived from Interferometric Synthetic Aperture Radar (InSAR) data obtained by the Canadian Space Agency's (CSA) RADARSAT-1, the Japan Aerospace Exploration Agency's (JAXA) Advanced Land Observation Satellite (ALOS), and the German Aerospace Center's (DLR) TerraSAR-X/TanDEM-X (TSX/TDX) satellites, as well as from the European Space Agency's (ESA) C-band Synthetic Aperture Radar data from Copernicus Sentinel-1A and -1B. This data set contains eleven winter Greenland ice sheet-wide mosaicked velocity maps derived from Synthetic Aperture Radar (SAR) data. Depending on the year, different platforms and sensors were used to produce these data (see Table 3). For each winter, a shapefile is included to indicate the source satellite image pairs that were processed to produce the mosaic. Since speckle tracking may fail to produce results at some points within a SAR image pair, the swaths listed in the shapefile only indicate which data could have contributed to a particular point (i.e., some data from that swath were used in the mosaic, but at any particular point, there may not have been a valid result from that swath). Joughin, I., B. Smith, I. Howat, and T. Scambos. 2015, updated 2018. MEaSUREs Greenland Ice Sheet Velocity Map from InSAR Data, Version 2. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/OC7B04ZM9G6Q. 13 Nov 2020.

本数据集隶属于美国国家航空航天局（National Aeronautics and Space Administration, NASA）的科研环境用地球系统数据记录制作（Making Earth System Data Records for Use in Research Environments, MEaSUREs）计划，包含格陵兰岛全域季节性（冬季）冰盖速度测绘图。该系列地图经多源卫星遥感数据处理生成，包括加拿大空间局（Canadian Space Agency, CSA）RADARSAT-1、日本宇宙航空研究开发机构（Japan Aerospace Exploration Agency, JAXA）先进陆地观测卫星（Advanced Land Observation Satellite, ALOS）、德国航空航天中心（German Aerospace Center, DLR）TerraSAR-X/TanDEM-X（TSX/TDX）卫星获取的干涉合成孔径雷达（Interferometric Synthetic Aperture Radar, InSAR）数据，以及欧洲空间局（European Space Agency, ESA）哥白尼Sentinel-1A、1B卫星的C波段合成孔径雷达（Synthetic Aperture Radar, SAR）数据。
本数据集共包含11幅基于合成孔径雷达数据生成的格陵兰岛冬季全域拼接冰盖速度地图。根据生产年份的不同，所采用的卫星平台与传感器存在差异（详见表3）。
针对每个冬季，数据集均附带一个shapefile文件，用于标注用于生成该拼接图的源卫星影像对。由于斑点跟踪算法可能在部分SAR影像对的点位无法生成有效结果，因此shapefile中列出的条带仅代表该类数据曾参与该拼接图的制作，即该条带的部分数据被用于生成拼接图，但在任意特定点位，未必存在来自该条带的有效结果。
本数据集版本为V2，由Joughin I.、Smith B.、Howat I.与Scambos T.编制，2015年发布并于2018年更新，数据集名称为《MEaSUREs格陵兰冰盖干涉合成孔径雷达速度地图》，存储于美国科罗拉多州博尔德市的美国国家冰雪数据中心分布式主动存档中心（NASA National Snow and Ice Data Center Distributed Active Archive Center），DOI标识为https://doi.org/10.5067/OC7B04ZM9G6Q，最后更新时间为2020年11月13日。