Laser altimeter data obtained over sea-ice during the PoleAirship campaign in Apr, 2007; profile Total_Pole_Airship_2007_SBLA_20070416T1903_88.54_-49.82_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the PoleAirship campaign in Apr, 2007 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Helicopter (Mil MI-8). A method developed by Hibler (1972) was used to a) isolate the surface profile from low-frequency variations associated with the aircraft motion and b) to identify pressure ridge sails. The processing steps are described in https://epic.awi.de/id/eprint/56364/. We applied a ridge detection threshold of 0.6 m, which means that only sails higher 0.6 m are detected. Version and name of the processing routine: Laser_Altimeter_Processing_VS5_06_20.py (vers.5, Feb 22, 2024, https://gitlab.awi.de/sitem/sbla_processing.git). SBLA records (RIEGL - LD90) are provided at a sampling rate of 100 Hz. Sensor accuracy is 5 cm with a beam diameter at surface of 5.8 cm. This specific dataset was obtained on 20070416T1903. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 5.8 cm . File name: [DMS/PANGAEA Campaing Identifier] + [DEVICE] + [DATE/TIME] + [LAT/LON] + [Detection Threshold] + [Object] + [Version] + [Format]本数据集为2007年4月“极空飞艇（PoleAirship）”科考航次期间获取的海冰表面粗糙度数据，采集方式为：由米-8（Mil MI-8）直升机牵引、飞行高度距地表10至30米的电磁系统（EM-Bird）内部搭载单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成观测。本研究采用Hibler（1972）提出的方法开展两项数据处理：a）从与飞行器运动相关的低频波动中分离出表面剖面；b）识别海冰脊帆（pressure ridge sails）。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度超过0.6米的冰脊帆。数据处理程序的名称与版本为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，获取地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本次使用的SBLA设备型号为RIEGL LD90，采样率为100 Hz；传感器精度为5厘米，地表激光光斑直径为5.8厘米。本数据集采集于2007年4月16日19时03分（20070416T1903），包含记录的高度计读数、反演得到的表面高程，以及已识别冰脊帆的宽度、高度与间距信息。数据质量备注：5.8厘米。文件名命名规则：[DMS/PANGAEA科考航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]