Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul, 2012; profile TIFAX_2012_SBLA_20120721T1427_81.18_-0.09_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the TIFAX campaign in Jul, 2012 with a Single Beam Laser Altimeter (SBLA) mounted inside an electromagnetic system (EM-Bird) towed at 10-30 m height above surface by a Airplane (Basler BT-67, Polar-5). 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 20120721T1427. 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2012年7月TIFAX科考航次期间采集的海冰表面粗糙度数据。实验采用安装于航空电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA），该系统由巴特勒BT-67（Polar-5）飞机拖曳，飞行高度距地表10~30米。本研究采用Hibler（1972）提出的处理方法，实现两项核心目标：a）分离受飞行器运动影响的低频噪声，得到纯净的地表剖面数据；b）识别海冰压力脊帆结构。完整处理流程详见文档：https://epic.awi.de/id/eprint/56364/。本次数据采用的压力脊帆检测阈值为0.6米，即仅可检测出高度不低于0.6米的脊帆结构。所用数据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，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集所用SBLA传感器为RIEGL LD90，采样率为100Hz，传感器测量精度为5厘米，地表激光光斑直径为5.8厘米。本数据集的采集时间为2012年7月21日14时27分（格式编码：20120721T1427），包含原始高度计读数、反演得到的地表高程数据，以及检测到的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。文件命名规则为：[DMS/PANGAEA航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]。