Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul-Aug, 2016; profile TIFAX_2016_SBLA_20160729T1321_85.64_-52.60_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 20160729T1321. 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2016年7-8月的TIFAX科考航次，搭载设备为安装于电磁系统（electromagnetic system，EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）；该电磁系统由Basler BT-67型飞机（极地6号，Polar-6）拖曳，飞行高度为海面上方10至30米。 本次数据处理采用Hibler（1972）提出的方法，完成两项核心任务：a）从与飞行器运动相关的低频噪声中分离出海冰表面剖面，b）识别海冰压力脊帆体（pressure ridge sails）。数据处理的详细步骤详见https://epic.awi.de/id/eprint/56364/。 本次研究采用0.6米的脊体检测阈值，即仅能识别高度高于0.6米的冰脊帆体。 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，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 单波束激光高度计的记录设备为RIEGL LD90，采样率为100赫兹。该传感器的测量精度为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20160729T1321（即2016年7月29日13时21分）。数据集包含高度计原始读数、反演得到的海面高程数据，以及已识别的海冰压力脊帆体的宽度、高度与间距信息。 数据质量备注：5.8厘米。 文件名命名规则：由[DMS/PANGAEA科考航次标识符]、[设备名称]、[日期/时间]、[经纬度]、[检测阈值]、[目标对象]、[版本号]与[文件格式]依次拼接而成。