Laser altimeter data obtained over sea-ice during the SEDNA campaign in Apr, 2007; profile SEDNA_SBLA_20070414T0011_71.60_-155.40_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the SEDNA campaign in Apr, 2007 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 20070414T0011. 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2007年4月开展的SEDNA科考航次（SEDNA campaign），采用安装于航空电磁系统（electromagnetic system, EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter, SBLA）完成采集；该系统由直升机以距海面10~30米的高度拖曳飞行，直升机型号未知。 本次研究采用Hibler（1972）提出的处理方法，实现两项核心工作：a）从伴随平台运动的低频噪声中分离出海面剖面；b）识别海冰压力脊帆（pressure ridge sails）。完整数据处理流程可参阅：https://epic.awi.de/id/eprint/56364/。 本次实验设置的脊线检测阈值为0.6米，即仅高度高于0.6米的压力脊帆可被识别。所用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，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 本数据集所用SBLA设备为RIEGL LD90型号，采样率为100Hz。该传感器的测量精度为5厘米，地表光束光斑直径为5.8厘米。 本特定数据集的采集时间为2007年4月14日00时11分（编码为20070414T0011），包含原始记录的高度计读数、反演得到的海面高程数据，以及检测得到的压力脊帆的宽度、高度与间距信息。 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] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]
