Laser altimeter data obtained over sea-ice during the GreenIce campaign in May, 2004; profile GreenICE2004_SBLA_20040513T1851_85.31_-72.14_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the GreenIce campaign in May, 2004 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 (Unknown model). 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 20040513T1851. 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]
本海冰表面粗糙度数据集采集于2004年5月开展的GreenIce科考项目。数据采集过程中，将单波束激光高度计（Single Beam Laser Altimeter, SBLA）安装于电磁系统（electromagnetic system, EM-Bird）内部，该系统由未知型号的直升机拖曳，飞行高度距地表10至30米。研究采用Hibler（1972）提出的方法完成两项核心处理任务：a）从与飞行器运动相关的低频噪声中分离出地表剖面；b）识别压力脊帆（pressure ridge sails）。具体处理流程可参考https://epic.awi.de/id/eprint/56364/。本次处理设置的脊线检测阈值为0.6米，即仅能识别高度不低于0.6米的压力脊帆。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，源码仓库地址：https://gitlab.awi.de/sitem/sbla_processing.git）。本次使用的单波束激光高度计（SBLA）为RIEGL LD90型号，采样率为100 Hz。传感器测量精度为5厘米，地表激光光斑直径为5.8厘米。本数据集的采集时间为20040513T1851。数据集包含记录的高度计原始读数、反演得到的地表高程，以及检测到的压力脊帆的宽度、高度与间距信息。数据质量备注：5.8厘米。数据集文件命名格式为：[DMS/PANGAEA科考项目标识符] + [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]
