Laser altimeter data obtained over sea-ice during the CASIMBO campaign in Apr, 2015; profile CAS2015_SBLA_20150419T2218_72.70_-134.14_thr06_data_Vers5@en

Sea ice surface roughness data were obtained during the CASIMBO campaign in Apr, 2015 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). 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 20150419T2218. 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于2015年4月的CASIMBO科考航次，采用安装于电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成采集。该电磁系统由Basler BT-67型飞机拖曳，飞行高度设定为地表上方10~30米。 本研究采用Hibler（1972）提出的处理方法，实现两项核心任务：a）从与飞行器运动相关的低频噪声中分离出地表剖面信号；b）识别冰脊帆状结构。详细处理流程可参见https://epic.awi.de/id/eprint/56364/。 本次数据处理设置的冰脊检测阈值为0.6米，即仅可识别高度不低于0.6米的冰脊帆结构。所用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，代码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。 本数据集所用SBLA设备为RIEGL LD90型，采样率为100 Hz，传感器测量精度为5厘米，地表处激光束直径为5.8厘米。本特定数据集的采集时间为2015年4月19日22时18分（标识为20150419T2218），包含记录的高度计原始读数、导出的地表高程数据，以及检测得到的冰脊帆结构的宽度、高度与间距信息。 数据质量说明：地表处激光束直径为5.8厘米。 文件名命名规则：[DMS/PANGAEA科考航次标识符] + [设备标识] + [日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]