Seabed imagery from IN2017_V01, Sabrina Seafloor survey, East Antarctica

Six camera tow transects were completed during survey IN2017-V01 on the RV Investigator in January to March 2017. This survey focussed on the upper slope and outer continental shelf on the Sabrina Coast seafloor in East Antarctica. Camera tows targeted seafloor depths between 480 and 1680 m. Imagery was collected using the Marine National Facilities Deep Tow Camera. This system collects oblique downward facing still images with a Canon 1DX and high definition video with a Canon C300. Four DSP&L 3150 High Output SeaLite Sphere lights were used, with MicroSeaLasers providing a 10cm scale guide on the images. Several sensors are also attached to the towed body, including a SBE 37 for CTD measurements, a Kongsberg Mesotech – 1007D altimeter, a Druck PMP 5074 pressure sensor and two Sonardyne USBLs for locational accuracy of the towed body. The USBL failed for tow A008CAM02, with locations recorded as ship’s position instead and camera position based on layback calculations. Images failed to record on A004CAM01, with only 2 images saved. Due to a timing error between the images and the other sensors, there is an offset between the CTD, altimeter and pressure data and the images. This is currently being resolved by the MNF. Tows were designed to run down slope to reduce potential for colliding with the bottom. All tows were run with a ship speed over the ground of approximately 2 kt. All still images were saved in jpeg format with video footage recorded to HD1080i50 format. The video data is unclipped and includes descent and ascent in the water column. Following collection still images were colour corrected in Adobe Photoshop to remove the blue bias. Images are available on the NCI with the following file structure:MARINE IMAGERY COLLECTION└─ PLATFORM_NAME └── CAMPAIGN_NAME └─── DEPLOYMENT_NAME ├───── images/ └────── metadata.csvWhere- PLATFORM_NAME is the name of the platform (e.g. Towed still imagery, Towed video imagery)- CAMPAIGN_NAME is the name of a campaign (e.g. IN2017_V01)- DEPLOYMENT_NAME is the name of the deployment or dive (e.g. IN2017_V01_A04_CAM01 is the voyage name, following by station number, followed by camera tow number)- images/ is a directory containing video and still image files- metadata.csv is a file containing position info and references to image files (e.g. timestamp, image_filename, depth from sensor on camera frame, altitude, CTD temperature, conductivity, pressure, dissolved oxygen, salinity, latitude, longitude and depth from USBL unless otherwise specified, comments)We thank the Marine National Facility, the IN2017-V01 scientific party-led by the Chief Scientists L.K. Armand and P. O’Brien, MNF support staff and ASP crew members led by Capt. M. Watson for their help and support on board the RV Investigator. This dataset is published with the permission of the CEO, Geoscience Australia and according to MNF data policy.

2017年1月至3月，在“调查者号”科考船（RV Investigator）的IN2017-V01航次中，共完成6次摄像拖曳断面测量。本次航次的研究区域为东南极洲萨布里纳海岸（Sabrina Coast）的陆架外缘与上陆坡海域。摄像拖曳作业的目标水深范围为480米至1680米。

影像数据由海洋国家设施（Marine National Facilities）深拖摄像系统采集。该系统搭载佳能1DX相机采集斜向下拍摄的静态图像，并使用佳能C300设备录制高清视频。本次作业共使用4台DSP&L 3150高功率SeaLite Sphere水下照明灯，搭配MicroSeaLasers在影像中生成10厘米比例尺标尺。

拖曳体还搭载了多类传感器：用于CTD（温盐深）测量的SBE 37传感器、Kongsberg Mesotech 1007D高度计、Druck PMP 5074压力传感器，以及两台Sonardyne超短基线定位系统（USBL），以保障拖曳体的定位精度。A008CAM02航次的超短基线定位系统出现故障，此时采用母船位置替代拖曳体位置，并通过拖距计算获取摄像位置。A004CAM01航次未成功采集影像，仅保存了2张静态图像。由于影像采集与其他传感器存在计时偏差，CTD、高度计、压力传感器数据与影像之间存在时间偏移，该问题目前正由海洋国家设施（MNF）进行修复。

本次拖曳作业设计为沿坡向下进行，以降低与海底碰撞的风险。所有拖曳作业的母船对地航速均约为2节（kt）。所有静态图像均以JPEG格式存储，视频素材则采用HD1080i50格式录制。视频数据未经过剪辑，包含了水下升降过程的影像。

采集完成后，科研人员使用Adobe Photoshop对静态图像进行色彩校正，以消除蓝色色偏。本数据集可在国家计算基础设施（NCI）获取，文件目录结构如下：
海洋影像数据集
└─ 平台名称（PLATFORM_NAME）
└── 航次名称（CAMPAIGN_NAME）
└─── 部署任务名称（DEPLOYMENT_NAME）
├───── images/
└────── metadata.csv
其中：
- PLATFORM_NAME：平台类型（如拖曳静态影像、拖曳视频影像）
- CAMPAIGN_NAME：航次名称（如IN2017_V01）
- DEPLOYMENT_NAME：部署/潜次名称（如IN2017_V01_A04_CAM01，格式为航次名+站位号+摄像拖曳编号）
- images/：存储视频与静态影像文件的目录
- metadata.csv：包含位置信息与影像文件索引的元数据文件，内容涵盖时间戳、影像文件名、摄像帧传感器测得的水深、高度、CTD温度、电导率、压力、溶解氧、盐度、纬度、经度，以及超短基线定位系统测得的水深（另有说明的除外），以及备注信息。

本次数据集的完成离不开“调查者号”科考船的支持，在此感谢海洋国家设施（MNF）、由首席科学家L.K. 阿尔芒（L.K. Armand）与P. 奥布莱恩（P. O’Brien）带领的IN2017-V01航次科考团队、MNF技术支持人员，以及由M. 沃森船长（Capt. M. Watson）带领的ASP船员团队。本数据集经澳大利亚地质调查局（Geoscience Australia）首席执行官批准，并遵循海洋国家设施数据政策发布。