Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul-Aug, 2016; profile TIFAX_2016_SBLA_20160731T1351_84.71_-18.14_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the TIFAX campaign in Jul-Aug, 2016 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by an Airplane (Basler BT-67, Polar-6). 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 20160731T1351. 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]本数据集的海冰表面粗糙度数据采集于2016年7-8月开展的TIFAX科考任务期间，搭载设备为集成于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA），该系统由巴斯勒BT-67型飞机（Polar-6，极地6号）拖曳，作业高度为距海冰表面10至30米。 本次研究采用Hibler（1972）提出的方法完成两项核心处理步骤：a）从与飞机运动相关的低频波动中分离出海冰表面剖面；b）识别海冰压力脊帆（pressure ridge sails）。数据处理的详细步骤详见https://epic.awi.de/id/eprint/56364/。 本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度高于0.6米的海冰压力脊帆。 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，代码托管地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 本数据集所用单波束激光高度计（SBLA）为RIEGL LD90型号，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。 本次特定数据集的采集时间为2016年7月31日13时51分（时间戳格式：20160731T1351）。 该数据集包含高度计原始观测读数、反演得到的海冰表面高程，以及已识别海冰压力脊帆的宽度、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 科考任务标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]