Laser altimeter data obtained over sea-ice during the TIFAX campaign in Aug, 2011; profile TIFAX_2011_SBLA_20110803T1024_83.76_-15.01_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the TIFAX campaign in Aug, 2011 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-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 20110803T1024. 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]
海冰表面粗糙度数据采集于2011年8月开展的TIFAX科考航次，所用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Basler BT-67型"Polar-5"飞机拖曳，飞行高度距海面10~30米。 本次研究采用Hibler（1972）提出的处理方法，实现两项核心目标：a）分离出与飞行器运动相关的低频干扰后的海面剖面；b）识别海冰压力脊帆（pressure ridge sails）。具体处理流程详见公开文档：https://epic.awi.de/id/eprint/56364/。 本次数据处理采用0.6米的脊帆检测阈值，即仅能识别高度不低于0.6米的压力脊帆。所用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）。 本数据集的SBLA数据由RIEGL LD90设备采集，采样率为100 Hz。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2011年8月3日10时24分（时间标识为20110803T1024），数据集包含原始高度计读数、反演得到的海面高程数据，以及检测到的海冰压力脊帆的宽度、高度与间距信息。 数据质量说明：激光光斑直径为5.8厘米。 数据集文件名命名规则为：[DMS/PANGAEA科考航次标识] + [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]
