ICESat-2 Arctic Sea Ice Surface Topography from the University of Maryland-Ridge Detection Algorithm: April 2019, 2020, and 2021

This dataset is derived from the ICESat-2 (IS-2) Global Geolocated Photon Height Product (ATL03) using the University of Maryland-Ridge Detection Algorithm (UMD-RDA). The UMD-RDA is applied to ATL03 on a per-shot basis, nominally resulting in elevation measurements at IS-2's maximum along-track resolution of ~0.7 m. From these elevation measurements, the UMD-RDA can measure various sea ice parameters including, but not limited to, individual ridge crests and their respective sail heights, the distance between ridges, and sea ice surface roughness. <strong>********Changes in Version 2********</strong> <em>Version 2 includes a column for time (seconds since 2018-01-01) in all parameter files in addition to longitude, latitude, and parameter value.</em> <em>The full resolution UMD-RDA derived elevation data was too large to host here, but is available upon request. If you need a particular track or segment for your research please contact me with your request by email: kd</em><em>uncan at umd dot edu</em>本数据集源自采用马里兰大学山脊检测算法（University of Maryland-Ridge Detection Algorithm，UMD-RDA）处理得到的ICESat-2（IS-2）全球地理定位光子高度产品（ATL03）。该UMD-RDA算法以单次发射为处理单元开展运算，名义上可实现ICESat-2沿轨方向约0.7米的最高沿轨分辨率高程测量。基于此类高程测量结果，UMD-RDA可反演多种海冰参数，包括但不限于单个山脊脊线及其对应帆高、山脊间距，以及海冰表面粗糙度。<strong>********版本2变更说明********</strong> <em>版本2在所有参数文件中新增了时间列（单位为自2018年1月1日起的秒数），同时包含经度、纬度与参数值。</em> <em>全分辨率UMD-RDA导出的高程数据体量过大，无法在此处托管，如有需要可通过邮件申请获取。若您的研究需要特定轨道或片段数据，请发送邮件至：[e-mail]（原格式为kduncan at umd dot edu）。</em>