Laser altimeter data obtained over sea-ice during the SIZONet campaign in Apr, 2010; profile SIZONet2010_SBLA_20100410T1826_71.75_-155.90_thr06_data_Vers5
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Sea ice surface roughness data were obtained during the SIZONet campaign in Apr, 2010 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 20100410T1826. 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2010年4月开展的SIZONet科考航次。实验中，搭载于电磁探测系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）被挂载于未知型号直升机下方，以距海面10至30米的高度进行拖曳作业。研究采用Hibler于1972年提出的处理方法，完成两项核心任务：a）从与直升机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（pressure ridge sails）。具体处理步骤详见公开链接：https://epic.awi.de/id/eprint/56364/。本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度不低于0.6米的冰脊帆。所用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，代码仓库链接：https://gitlab.awi.de/sitem/sbla_processing.git）。本次实验所用SBLA为RIEGL LD90型号，其采样率为100 Hz。该传感器的测量精度为5厘米，地表激光束光斑直径为5.8厘米。本数据集的具体采集时间为2010年4月10日18时26分（对应编号20100410T1826）。数据集包含记录的高度计原始读数、反演得到的海冰表面高程，以及已识别冰脊帆的宽度、高度与间距。数据质量说明：5.8厘米。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] + [目标物类型] + [版本号] + [文件格式]
