Laser altimeter data obtained over sea-ice during the CASIMBO campaign in Apr, 2015; profile CAS2015_SBLA_20150423T1834_70.88_-134.19_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 20150423T1834. 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]本数据集的海冰表面粗糙度数据采集于2015年4月开展的CASIMBO科考航次，将单波束激光高度计（Single Beam Laser Altimeter，SBLA）安装于电磁系统（EM-Bird）内部，该系统由Basler BT-67型飞机拖曳，飞行高度距海冰表面10至30米。本次处理采用Hibler（1972）提出的方法，完成两项核心工作：a）分离受飞机运动引发的低频噪声干扰后的海冰表面剖面；b）识别海冰压力脊帆（pressure ridge sails）。数据处理步骤详见https://epic.awi.de/id/eprint/56364/。本次处理设置的脊体检测阈值为0.6米，即仅识别高度高于0.6米的冰脊帆体。数据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，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本次使用的SBLA设备为RIEGL LD90型，采样率为100 Hz，传感器测量精度为5厘米，地表波束直径为5.8厘米。本数据集的采集时间为2015年4月23日18时34分（20150423T1834），包含记录的高度计读数、反演得到的海冰表面高程，以及检测到的冰脊帆体的宽度、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科考航次标识符] + [设备名称] + [采集日期/时间] + [经纬度] + [检测阈值] + [目标对象] + [处理版本] + [文件格式]。