Digital SAR Mosaic and Elevation Map of the Greenland Ice Sheet, Version 1

The Digital SAR Mosaic and Elevation Map of the Greenland Ice Sheet combines the most detailed synthetic aperture radar (SAR) image mosaic available with the best current digital elevation model. The mosaic image shows both the location of the ice edge and the distribution of melt-related 'scatterers' on the surface. These scatterers include ice lenses and complex layered structure in the percolation zone and bare ice of the ablation zone. Other melt-related features that can be seen include lake and surface meltwater stream channels at lower elevations, as well as ice-marginal lakes. This characterization of the ice sheet provides a reference against which future change can be measured. Changing conditions resulting from climatic variation should show up as changes in the ice margin and shifts in the hydrologic zones. It is hoped that the standard reference provided by this data set can facilitate activities aimed at change detection and promote other work aimed at understanding the processes operating on the ice sheet. The image data are derived from SAR image swaths acquired by the ERS-1 satellite during August of 1992. The mosaic was assembled at the Jet Propulsion Laboratory (JPL) and Goddard Space Flight Center (GSFC). Its component images are a copyrighted product of the European Space Agency. The mosaic, a value-added derived product, is available to individuals and non-profit organizations for research oriented purposes only. The Danish geodetic and cadastral agency Kort-og Matrikelstyrelsen (KMS) compiled the elevation data provided with the product from a number of sources, including field surveys, aerial photographs, and the ERS-1 radar altimeter.格陵兰冰盖数字合成孔径雷达（Synthetic Aperture Radar, SAR）镶嵌图与高程地图数据集整合了当前可获取的最精细SAR镶嵌影像与现有最优数字高程模型。该镶嵌影像可同时呈现冰盖边缘的位置，以及冰盖表面与融冰相关的“散射体”分布特征。此类散射体涵盖渗流带内的冰透镜体与复杂层状结构，以及消融区的裸冰区域。此外还可观测到其他与融冰相关的特征：低海拔区域的融水湖泊与地表河道，以及冰缘湖泊。 本冰盖特征数据集可作为基准参考，用于量化评估冰盖未来的变化情况。气候变化引发的冰盖状态改变，将通过冰盖边缘的变化与水文带的偏移体现出来。期望本数据集提供的标准参考基准，能够助力冰盖变化检测相关研究，并推动针对冰盖表面作用过程的机制探索工作。 本数据集的影像数据源自1992年8月欧洲遥感卫星1号（ERS-1）获取的SAR影像条带。该镶嵌影像由喷气推进实验室（Jet Propulsion Laboratory, JPL）与戈达德航天飞行中心（Goddard Space Flight Center, GSFC）联合拼接完成，其原始影像数据为欧洲空间局（European Space Agency）的版权产品。本镶嵌影像是增值衍生产品，仅可向个人与非营利性机构开放，用于科研相关用途。配套的高程数据由丹麦地籍与测绘局（Kort-og Matrikelstyrelsen, KMS）整合多源数据编译而成，数据来源包括野外实测、航空摄影资料与ERS-1雷达高度计数据。