Laser altimeter data obtained over sea-ice during the ARK-XXVI/3 campaign in Aug-Sep, 2011; profile ARK-XXVI-3_SBLA_20110826T0406_88.26_-135.12_thr06_data_Vers5@en

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 20110826T0406. 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2011年8—9月开展的ARK-XXVI/3科考航次。实验搭载单波束激光高度计（Single Beam Laser Altimeter, SBLA），该高度计集成于电磁系统（EM-Bird）内，由搭载于‘极星号’科考船的直升机以10~30米的地表离地高度拖曳作业。
研究采用Hibler（1972）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。详细处理流程可参考https://epic.awi.de/id/eprint/56364/。
本次处理设置的冰脊检测阈值为0.6米，即仅识别高度不低于0.6米的冰脊帆。处理程序的版本与名称为：Laser_Altimeter_Processing_VS5_06_20.py（版本5，2024年2月22日，https://gitlab.awi.de/sitem/sbla_processing.git）。
本次使用的SBLA数据采集设备为RIEGL LD90，采样率为100Hz，传感器精度为5厘米，地表激光光斑直径为5.8厘米。本特定数据集的采集时间为20110826T0406，数据包含记录的高度计读数、反演得到的表面高程，以及检测到的冰脊帆的宽度、高度与间距信息。
数据质量备注：5.8厘米。
文件命名规则：文件名由以下字段拼接而成：[DMS/PANGAEA 科考航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]