Laser altimeter data obtained over sea-ice during the TIFAX campaign in Aug, 2017; profile P6_207_TIFAX_2017_SBLA_20170822T1210_88.30_-16.76_thr06_data_Vers5
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Sea ice surface roughness data were obtained during the TIFAX campaign in Aug, 2017 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 20170822T1210. 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]
本数据集为海冰表面粗糙度数据，采集于2017年8月的TIFAX考察航次。数据通过单波束激光高度计（Single Beam Laser Altimeter，SBLA）获取，该高度计搭载于电磁系统（EM-Bird）内部，由Basler BT-67型飞机（极地6号，Polar-6）拖曳，飞行高度为海面上方10至30米。 本次研究采用Hibler于1972年提出的方法完成两项核心处理任务：a）从与飞机运动相关的低频信号波动中分离出海冰表面原始剖面；b）识别冰面压力脊帆。处理流程详见https://epic.awi.de/id/eprint/56364/。 本次研究设置的冰脊检测阈值为0.6米，即仅可识别高度大于0.6米的冰脊帆。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型号为RIEGL LD90，数据采样率为100赫兹。传感器精度为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2017年8月22日12时10分（格式标识：20170822T1210）。数据集包含记录的高度计原始读数、反演得到的海面高程，以及已识别的冰面压力脊帆的宽度、高度与间距。 数据质量说明：地表激光光斑直径为5.8厘米。 文件名命名规则为：[DMS/PANGAEA考察航次标识符] + [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]
