Laser altimeter data obtained over sea-ice during the SIZONet campaign in Apr, 2012; profile SIZONet2012_SBLA_20120409T2224_72.46_-156.09_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the SIZONet campaign in Apr, 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 Helicopter (Unknown model). 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 20120409T2224. 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2012年4月的SIZONet科考航次（SIZONet campaign），采用集成于电磁系统EM-Bird内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）获取，该系统由型号未知的直升机以距海面10-30米的高度拖曳作业。本研究采用Hibler于1972年提出的方法完成两项核心处理：a) 分离与平台运动相关的低频变化，提取得到真实海面高程剖面；b) 识别冰面压力脊帆（pressure ridge sails）。数据完整处理流程详见https://epic.awi.de/id/eprint/56364/。本次分析设置的冰脊检测阈值为0.6米，即仅能识别高度不低于0.6米的冰脊帆。数据处理程序版本及名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集所用的单波束激光高度计型号为RIEGL LD90，采样率为100 Hz，传感器测量精度为5厘米，激光波束在海面的光斑直径为5.8厘米。本次特定数据集的采集时间为2012年4月9日22时24分（格式为20120409T2224）。数据集包含记录的高度计原始读数、反演得到的海面高程数据，以及检测到的冰面压力脊帆的宽度、高度与间距信息。数据质量备注：5.8 cm。文件名命名规则为：[DMS/PANGAEA科考航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]
