Laser altimeter data obtained over sea-ice during the ARK-XXVI/3 campaign in Aug-Sep, 2011; profile ARK-XXVI-3_SBLA_20110825T0409_88.51_-97.44_thr06_data_Vers5

Sea ice surface roughness data were obtained during the ARK-XXVI/3 campaign in Aug-Sep, 2011 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 (RV-Polarstern Helicopter). 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 20110825T0409. 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获取于2011年8月至9月的ARK-XXVI/3考察期间，采用的是安装在电磁系统（EM-Bird）内部的单光束激光高度计（SBLA），该系统由直升机（RV-Polarstern直升机）在距海面10-30米高度拖曳。
采用Hibler（1972）提出的方法，以a) 从与飞行器运动相关的低频变化中分离出表面轮廓，以及b) 识别压力脊帆。
处理步骤详见https://epic.awi.de/id/eprint/56364/。
我们采用了0.6米的脊检测阈值，即仅检测高度超过0.6米的脊帆。
处理程序的名称及版本：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。
单光束激光高度计（SBLA，RIEGL - LD90型号）的记录采样率为100赫兹。
传感器精度为5厘米，海面处的光束直径为5.8厘米。
本特定数据集的获取时间为20110825T0409。
该数据集包含记录的高度计读数、推导得到的表面高程，以及检测到的压力脊帆的宽度、高度和间距。
数据质量说明：5.8厘米。
文件名格式：[DMS/PANGAEA Campaing Identifier] + [设备] + [日期/时间] + [纬度/经度] + [检测阈值] + [对象] + [版本] + [格式]