Ice Velocity of Icelandic Glaciers

Ice velocity map of Icelandic glaciers derived from Sentinel-1 SAR data acquired from 2014-10-01 to 2020-12-31. The surface velocity is derived applying feature tracking techniques. The ice velocity map is provided at 100m grid spacing in North Polar Stereographic projection (EPSG: 3413). The horizontal velocity is provided in true meters per day, towards EASTING(vx) and NORTHING(vy) direction of the grid, and the vertical displacement (vz), is derived from a digital elevation model. Provided is a NetCDF file with the velocity components: vx, vy, vz and vv (magnitude of the horizontal components), along with maps of valid pixel count and uncertainty (stdx, stdy). The product was generated by ENVEO.

本数据集为冰岛冰川冰流速图，基于2014年10月1日至2020年12月31日获取的Sentinel-1合成孔径雷达（Synthetic Aperture Radar，SAR）数据生成。地表流速通过特征跟踪技术反演得到。该冰流速图采用北极立体投影（EPSG: 3413），网格间距为100米。水平流速以每日真实米数为单位，分量对应网格的东向（记为vx）与北向（记为vy）；垂直位移分量vz则由数字高程模型（Digital Elevation Model，DEM）反演得到。数据集以网络通用数据格式（NetCDF）文件提供，包含流速分量vx、vy、vz以及水平分量模值vv，同时附带有效像素计数图与不确定性指标stdx、stdy。本产品由ENVEO公司生成。