Laser altimeter data obtained over sea-ice during the TIFAX campaign in Jul-Aug, 2016; profile TIFAX_2016_SBLA_20160801T1512_82.08_-13.89_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the TIFAX campaign in Jul-Aug, 2016 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-6). 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 20160801T1512. 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2016年7-8月开展的TIFAX科考航次，搭载于单波束激光高度计（Single Beam Laser Altimeter，SBLA）。该高度计集成于电磁系统（EM-Bird）中，由巴斯勒BT-67型固定翼飞机（编号Polar-6）以10至30米的离地高度拖曳作业。本次数据处理采用Hibler于1972年提出的方法，完成两项核心任务：a）从与飞机运动相关的低频噪声中分离出真实冰面剖面；b）识别冰脊帆（pressure ridge sails）。数据处理流程详见链接：https://epic.awi.de/id/eprint/56364/。本次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）。所用单波束激光高度计型号为RIEGL LD90，采样率设为100赫兹。该传感器的测量精度为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2016年8月1日15时12分（20160801T1512）。数据集包含原始高度计读数、反演得到的冰面高程，以及已识别的冰脊帆的宽度、高度与间距信息。数据质量说明：5.8厘米。数据集文件命名规则为：[DMS/PANGAEA科考航次标识] + [设备标识] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [处理版本] + [文件格式]
