Laser altimeter data obtained over sea-ice during the IceBird Summer campaign in Jul-Aug, 2018; profile P6_211_ASIMBO_2018_SBLA_20180801T0655_83.38_-64.34_thr06_data_Vers5
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Sea ice surface roughness data were obtained during the IceBird Summer campaign in Jul-Aug, 2018 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, Polar-6). 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 (ASTECH - LDM) are provided at a sampling rate of 100 Hz. Sensor accuracy is 2 cm with a beam diameter at surface of 6.3 cm. This specific dataset was obtained on 20180801T0655. It includes recorded altimeter readings, the derived surface elevation and width/height/spacing of detected pressure ridge sails. Note on data quality: 6.3 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2018年7—8月开展的IceBird夏季科考航次，由搭载于机载电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）获取；该电磁系统由Basler BT-67型“极地6号”（Polar-6）固定翼飞机拖曳，飞行高度为地表上方10~30米。本研究采用Hibler（1972）提出的方法完成两项核心任务：a）滤除与飞行器运动相关的低频噪声，分离得到纯净地表剖面；b）识别海冰压力脊帆（pressure ridge sails）。数据处理的详细流程可参考https://epic.awi.de/id/eprint/56364/。 本次处理设置的冰脊检测阈值为0.6米，即仅可识别高度不低于0.6米的海冰压力脊帆。本次使用的处理程序版本与名称为：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）。 SBLA原始记录（ASTECH-LDM）的采样率为100 Hz，传感器测量精度为2厘米，地表处激光束光斑直径为6.3厘米。本数据集的采集时间为2018年8月1日06时55分（格式标识：20180801T0655），包含实测高度计读数、反演得到的地表高程，以及检测出的海冰压力脊帆的宽度、高度与间距。 数据质量说明：激光束地表光斑直径为6.3厘米。文件名命名规则：[DMS/PANGAEA航次标识] + [设备名称] + [日期/时间] + [经纬度] + [检测阈值] + [目标物] + [版本号] + [文件格式]
