Laser altimeter data obtained over sea-ice during the CryoVEx campaign in Mar-Apr, 2014; profile CryoVEx_ARK_2014_SBLA_20140330T2205_84.07_-15.28_thr06_data_Vers5
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Sea ice surface roughness data were obtained during the CryoVEx campaign in Mar-Apr, 2014 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 20140330T2205. 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自2014年3至4月的CryoVEx科考活动。本次科考中，单波束激光高度计（Single Beam Laser Altimeter, SBLA）搭载于电磁系统（EM-Bird）内，由未知型号的直升机牵引至地表上方10至30米高度开展作业。研究采用希勒（Hibler）1972年提出的方法完成两项核心处理：a）从与飞行器运动相关的低频噪声中分离出地表剖面；b）识别冰脊帆结构。具体处理流程详见链接https://epic.awi.de/id/eprint/56364/。本次数据集设置的冰脊检测阈值为0.6米，即仅能探测到高度高于0.6米的冰脊帆结构。本次使用的处理程序版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，对应代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。SBLA数据由RIEGL LD90型设备采集，采样率为100赫兹。该传感器的测量精度为5厘米，地表处的激光波束直径为5.8厘米。本数据集的采集时间为2014年3月30日22时05分（时间标识为20140330T2205），数据集包含记录的高度计读数、导出的地表高程数据，以及探测得到的冰脊帆的宽度、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科考活动标识符] + [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]
