The Reference Elevation Model of Antarctica (REMA): A High Resolution, Time-Stamped Digital Elevation Model for the Antarctic Ice Sheet

Howat/1543501该奖项将提供支持，以高空间分辨率和精度绘制南极大陆的地形图，以测量冰盖变化，约束模型，纠正卫星观测和支持后勤。南极洲仍然是地球上地图绘制最差的大陆，然而，准确和完整的表面地形对于广泛的科学和后勤活动至关重要。该小组将使用极高分辨率的卫星图像、现有的地面和空中调查数据以及NSF的超级计算机基础设施来构建南极洲参考高程模型（REMA）：一个连续的、有时间戳的参考表面，其分辨率将比目前可用的高一到两个数量级。REMA将从立体，由WorldView卫星星座收集的亚米分辨率图像，与国家地理空间情报局和NSF支持的极地地理空间中心（PGC）合作免费获得。图像的高空间和辐射分辨率使摄影测量数字高程模型（DEM）提取低对比度地形，如雪，冰和阴影。这些DEM的水平和垂直偏移可达数米，可通过单个地面控制点将其减小到0.2米的DEM相对精度。我们将使用来自地面和激光雷达测量的可用控制点来注册单个DEM和优化的最小二乘共注册，以提供大区域重叠DEM之间的控制。REMA将有一个10米的张贴和精度优于1米。它将由极地地理空间中心公开分发。该项目将涉及大量的本科生参与，提供地理空间科学和遥感方面的培训，REMA将广泛用于伯德极地和气候研究中心的推广方案。 该项目不需要在南极洲进行实地工作。

Howat/1543501This award will provide support to map the topography of the Antarctic continent at high spatial resolution and precision to measure ice sheet change, constrain models, correct satellite observations and support logistics. Antarctica remains the most poorly mapped landmass on Earth, yet, accurate and complete surface topography is essential for a wide range of scientific and logistical activities. The group will use a combination of very high-resolution satellite imagery, existing ground and airborne survey data and the NSF's supercomputer infrastructure to construct the Reference Elevation Model of Antarctica (REMA): a continuous, time-stamped reference surface that will be one to two orders of magnitude higher resolution than currently available.REMA will be constructed from stereoscopic, submeter resolution imagery collected by the WorldView satellite constellation, obtained at no cost in partnership with the National Geospatial Intelligence Agency and the NSF-supported Polar Geospatial Center (PGC). The high spatial and radiometric resolution of the imagery enables photogrammetric digital elevation model (DEM) extraction over low contrast terrains such as snow, ice and shadows. These DEM's have horizontal and vertical offsets of up to several meters that can be reduced to the DEM relative accuracy of 0.2 meter with a single ground control point. We will use available control points from ground and lidar surveys to register individual DEMs and optimized, least-squares co-registration to provide control between overlapping DEM's over large regions. REMA will have a posting of 10 meters and accuracy better than 1 meter. It will be distributed openly by the Polar Geospatial Center. This project will involve substantial undergraduate participation, providing training in geospatial science and remote sensing, and REMA will be used extensively for the outreach programs of the Byrd Polar and Climate Research Center. This project does not require field work in Antarctica.