Laser altimeter data obtained over sea-ice during the NETCARE campaign in Apr, 2015; profile NETCARE_P5_2015_SBLA_20150409T1439_86.11_-46.82_thr06_data_Vers5
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Sea ice surface roughness data were obtained during the NETCARE campaign in Apr, 2015 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 20150409T1439. 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2015年4月的NETCARE科考航次，采用安装于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter, SBLA）获取，该系统由Basler BT-67型“极地5号”飞机拖曳，飞行高度距地表10至30米。 本研究采用Hibler（1972）提出的处理方法，完成两项核心任务：a）分离出与飞行器运动相关的低频变化对应的表面剖面；b）识别冰脊帆结构。 详细处理流程可参见https://epic.awi.de/id/eprint/56364/。 本次实验设置的冰脊检测阈值为0.6米，即仅能检测到高度不低于0.6米的冰脊帆。 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）。 本数据集所用的单波束激光高度计为RIEGL LD90，采样率为100 Hz，传感器精度为5厘米，地表激光光斑直径为5.8厘米。 本次特定数据集的采集时间为20150409T1439（即2015年4月9日14时39分）。 数据集包含记录的高度计原始读数、反演得到的表面高程数据，以及检测出的冰脊帆的宽度、高度与间距信息。 数据质量补充说明：5.8厘米（地表激光光斑直径）。 文件名命名规则为：[DMS/PANGAEA科考航次标识符] + [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]
