Laser altimeter data obtained over sea-ice during the NETCARE campaign in Apr, 2015; profile NETCARE_P5_2015_SBLA_20150411T1550_82.50_-89.84_thr06_data_Vers5@en
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Sea ice surface roughness data were obtained during the NETCARE 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, Polar-5). 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 20150411T1550. 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月的NETCARE科考航次，采用集成于机载电磁系统（EM-Bird）内的单波束激光高度计（Single Beam Laser Altimeter，SBLA）完成采集；该系统由巴斯勒BT-67型科考飞机（Polar-5，极地5号）牵引，飞行高度为海冰表面上方10至30米。 研究采用Hibler于1972年提出的处理方法，实现两项核心操作：a）从与飞机运动相关的低频噪声中分离出海冰表面剖面；b）识别海冰冰脊帆体。 具体处理流程详见链接https://epic.awi.de/id/eprint/56364/。 本次处理设置的冰脊检测阈值为0.6米，即仅识别高度高于0.6米的冰脊帆体。 本次使用的处理程序名称与版本为：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）。 单波束激光高度计（SBLA）的原始记录设备为RIEGL LD90，采样率为100赫兹。该传感器的测量精度为5厘米，地表光斑直径为5.8厘米。 本数据集的采集时间为2015年4月11日15时50分（时间戳格式：20150411T1550）。 数据集包含高度计原始读数、反演得到的海冰表面高程，以及已识别冰脊帆体的宽度、高度与间距信息。 数据质量说明：5.8厘米。 文件名命名规则：[DMS/PANGAEA科考航次标识] + [设备标识] + [采集时间] + [经纬度] + [检测阈值] + [目标对象] + [版本号] + [文件格式]
