Laser altimeter data obtained over sea-ice during the SEDNA campaign in Apr, 2007; profile SEDNA_SBLA_20070408T1848_74.24_-146.44_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the SEDNA campaign in Apr, 2007 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 20070408T1848. 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2007年4月的SEDNA科考航次（SEDNA campaign），采用安装在电磁系统（EM-Bird）内部的单波束激光高度计（Single Beam Laser Altimeter, SBLA）进行采集。该系统由一架型号未知的直升机拖曳，作业高度距海面10~30米。本次数据处理采用Hibler（1972）提出的方法，实现两项核心任务：a）从原始数据中分离出与飞行器运动相关的低频噪声对应的表面剖面；b）识别海冰压力脊帆体（pressure ridge sails）。详细处理流程可参见：https://epic.awi.de/id/eprint/56364/。本次研究采用0.6米的冰脊检测阈值，即仅能检测到高度不低于0.6米的冰脊帆体。数据处理程序的版本与名称：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）。本次使用的单波束激光高度计型号为RIEGL LD90，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。本特定数据集的采集时间为2007年4月8日18时48分（格式标识：20070408T1848），数据集包含记录的高度计原始读数、推导得到的表面高程数据，以及检测到的冰脊帆体的宽度、高度与间距信息。数据质量备注：5.8厘米。文件名命名规则：由以下字段依次拼接而成：[DMS/PANGAEA航次标识符] + [设备名称] + [日期/时间] + [经纬度坐标] + [检测阈值] + [目标对象] + [版本号] + [文件格式]
