Lead classification maps from helicopter-borne surface temperatures with 1 m resolution during the MOSAiC expedition

Leads (open water and thin ice) were classified in helicopter-borne thermal infrared observations. Lead classification maps, gridded in 1 m resolution, are provided for 35 flights between 02.10.2019 and 23.04.2020 during the MOSAiC expedition in the Arctic ocean. There is one file for every flight, either on a local (MOSAiC central observatory) or regional scale (MOSAiC distributed network). The flights can be identified by two campaign specific IDs (the event-related Device Operation label or Flight ID). The lead classification maps are derived from the surface temperature maps (doi:10.1594/PANGAEA.941017) as described in Thielke et al (in preparation). The 5 m resolution data (based on block averaged surface temperature) are included to provide data with a smaller file size so they are easier accessible and available for the comparison of the effect of different spatial resolutions. The binary lead classification is performed with a temperature threshold. In this data set, in addition to the lead classification maps, also the surface temperature and time-fixed surface temperature maps are included (the same data as included in the temperature maps: doi:10.1594/PANGAEA.941017). This time-fixed surface temperature is necessary to perform the classification and included for direct comparison to the lead classification result. All data are georeferenced, also as relative coordinates to the position of RV Polarstern which allows a Polarstern centered, Lagrangian view on the lead development.本数据集针对机载热红外观测中的冰间水道（lead，涵盖开阔水域与薄冰）开展分类。针对2019年10月2日至2020年4月23日期间北极MOSAiC远征的35次飞行任务，提供了分辨率为1米的网格化冰间水道分类图。每次飞行对应一份数据文件，涵盖局地（MOSAiC中心观测站）或区域（MOSAiC分布式观测网络）两种观测尺度。飞行任务可通过两项科考专属标识进行识别：事件关联的设备作业标签（"Device Operation label"）或飞行编号（"Flight ID"）。冰间水道分类图源自地表温度图（doi:10.1594/PANGAEA.941017），相关分类方法详见Thielke等人（待刊）的研究成果。为缩小文件体积以提升可访问性，同时支持不同空间分辨率影响的对比分析，本数据集还包含基于块平均地表温度生成的5米分辨率数据。冰间水道的二分类任务采用温度阈值法完成。除冰间水道分类图外，本数据集还包含地表温度图与固定时间地表温度图（与doi:10.1594/PANGAEA.941017中的温度数据完全一致）。其中固定时间地表温度数据是完成冰间水道分类的必要输入，同时也可直接与分类结果开展对比分析。所有数据均完成地理坐标标定，同时提供以"极星号"科考船（RV Polarstern）位置为基准的相对坐标，支持以极星号为中心的拉格朗日（Lagrangian）视角下的冰间水道演化分析。