Laser altimeter data obtained over sea-ice during the PS106/2 campaign in Jun-Jul, 2017; profile PS106-2_SBLA_20170711T1322_81.54_14.81_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the PS106/2 campaign in Jun-Jul, 2017 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 (RV-Polarstern Helicopter). 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 20170711T1322. 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]本数据集为海冰表面粗糙度数据，采集于2017年6—7月开展的PS106/2科考航次，由搭载于电磁系统（electromagnetic system，EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成采集。该电磁系统由RV-Polarstern号直升机牵引，距地表高度为10~30米。本研究采用Hibler于1972年提出的方法，完成两项核心处理流程：a）分离与飞行器运动相关的低频变化，提取海冰表面剖面；b）识别海冰压力脊帆（pressure ridge sails）。该数据的完整处理步骤详见：https://epic.awi.de/id/eprint/56364/。本次处理设置的脊帆检测阈值为0.6米，即仅可检测到高度高于0.6米的脊帆。处理程序的版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，配套代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本次使用的SBLA记录设备为RIEGL LD90型，采样率为100赫兹。该传感器的测量精度为5厘米，地表波束直径为5.8厘米。本数据集的采集时间为20170711T1322（即2017年7月11日13时22分）。数据集包含记录的高度计原始读数、反演得到的海冰表面高程，以及已检测到的海冰压力脊帆的宽度、高度与间距。数据质量说明：5.8厘米。文件名命名规则为：[DMS/PANGAEA科考航次标识] + [设备名称] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标物类型] + [处理版本] + [文件格式]。