Seabed photographs taken along OFOBS profile HE502_4-1 during HEINCKE cruise HE502

The OFOBS system consisted of a towed underwater camera system equipped with both a high-resolution photo-camera (iSiTEC, CANON EOS 5D Mark III) and a high-definition video-camera (iSiTEC, Sony FCB-H11) as well as an integrated sidescan sonar system. The cameras were mounted on a steel frame (140L x 92W x 135H cm), together with two strobe lights (iSiTEC UW-Blitz 250, TTL driven), three laser pointers spaced with a distance of 50 cm used to estimate the size of seafloor structures, four LED lights, and a USBL positioning system (Posidonia) to track the position of the OFOBS during deployments, with additional positioning information provided by the integrated INS and DVL systems, which was undergoing testing during this cruise. In this dataset seabed photos from a height of approximately 60 cm from the seafloor, depicting an area of approximately 1.5 m**2, with variations depending on the actual height above ground of the system. Conditions were not optimal, with many particles in the water and considerable ship heave.OFOBS系统由一套拖曳式水下摄像系统构成，该系统搭载一台高分辨率数码相机（iSiTEC，佳能EOS 5D Mark III）、一台高清摄像机（iSiTEC，索尼FCB-H11）以及一套集成式侧扫声呐系统。所有设备均安装于尺寸为140L×92W×135H厘米的钢制框架之上，同时配套搭载两台TTL驱动频闪灯（iSiTEC UW-Blitz 250）、三支间距50厘米的激光笔（用于估算海底构造尺寸）、四盏LED补光灯，以及一套用于在部署作业期间追踪OFOBS系统位置的超短基线（USBL）定位系统（Posidonia）。此外，集成惯性导航（INS）与多普勒测速仪（DVL）的组合系统可提供额外定位信息，该系统在本航次中处于测试阶段。 本数据集包含的海底照片拍摄高度距海底约60厘米，单张覆盖面积约1.5平方米，具体覆盖范围会随系统实际离地高度有所变化。本次成像条件并非理想状态：水体中存在大量悬浮颗粒，且船体存在明显垂荡运动。