Laser altimeter data obtained over sea-ice during the ARK-XI/1 campaign in Jul-Sep, 1995; profile ARK-XI-1_SBLA_19950809T1301_81.35_106.75_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the ARK-XI/1 campaign in Jul-Sep, 1995 with a Single Beam Laser Altimeter (SBLA) mounted on an/a Helicopter (Mil MI-8) . 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 (IBEO - PS100E) are provided at a sampling rate of 200 Hz. Sensor accuracy is 3 cm with a beam diameter at surface of 11.4 cm. This specific dataset was obtained on 19950809T1301. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 11.4 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1995年7月至9月的ARK-XI/1科考航次，由搭载于米里Mi-8（Mil MI-8）直升机的单波束激光高度计（Single Beam Laser Altimeter, SBLA）完成获取。本次数据采用Hibler于1972年提出的处理方法，可实现两项核心流程：a）从与飞行器运动相关的低频噪声中分离出海冰表面剖面；b）识别海冰冰脊帆（pressure ridge sails）。数据处理的详细步骤可参考https://epic.awi.de/id/eprint/56364/。本次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。数据处理程序的名称与版本：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）。单波束激光高度计（SBLA）的原始记录型号为IBEO - PS100E，采样率为200赫兹。该传感器的测量精度为3厘米，地表激光束直径为11.4厘米。本数据集的具体采集时间为1995年8月9日13时01分（19950809T1301）。数据集包含原始高度计读数、反演得到的表面高程，以及已识别冰脊帆的宽度、高度与间距。数据质量说明：11.4厘米。文件名命名规则：[DMS/PANGAEA科考航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物类型] + [版本号] + [文件格式]