Laser altimeter data obtained over sea-ice during the PS92 campaign in May-Jun, 2015; profile PS92_SBLA_20150618T0848_81.81_9.85_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the PS92 campaign in May-Jun, 2015 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 (RV-Polarstern Helicopter). 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 20150618T0848. 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2015年5—6月开展的PS92科考航次，由搭载于电磁系统（EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter，SBLA）获取，该系统由RV-Polarstern号直升机拖曳，作业时距海面高度为10~30米。本研究采用Hibler（1972）提出的方法完成两项核心处理流程：其一，从与飞行器运动相关的低频噪声中分离出真实海面剖面；其二，识别海冰压力脊帆体。数据处理的详细步骤可参考https://epic.awi.de/id/eprint/56364/。本次处理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米的冰脊帆体。数据处理程序的版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，发布于2024年2月22日，代码托管地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本数据集采用的SBLA设备为RIEGL LD90型单波束激光高度计，采样率为100 Hz，传感器测量精度为5厘米，地表探测光束直径为5.8厘米。本次特定数据集的采集时间为20150618T0848（即2015年6月18日08时48分），数据内容包含记录的高度计原始读数、反演得到的海面高程，以及检测到的冰脊帆体的宽度、高度与间距。数据质量说明：5.8厘米。文件命名规则为：[DMS/PANGAEA科考航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]
