Underwater images collected by an Autonomous Surface Vehicle in Aldabra-Arm01, Seychelles - 2022-10-21

This dataset was collected by an Autonomous Surface Vehicle in Aldabra-Arm01, Seychelles - 2022-10-21. Underwater or aerial images collected by scientists or citizens can have a wide variety of use for science, management, or conservation. These images can be annotated and shared to train IA models which can in turn predict the objects on the images. We provide a set of tools (hardware and software) to collect marine data, predict species or habitat, and provide maps. This dataset is part of larger collection referencing numerous underwater and aerial images Seatizen Altas. Methods, tools and scientific objectives are also described in a dedicated data paper. Image acquisition This session has 12.98 GB of MP4 files, which were trimmed into 4996 frames (at 2997/1000 fps). The frames are georeferenced. 99.28% of these extracted images are useful and 0.72% are useless, according to predictions made by Jacques model. Multilabel predictions have been made on useful frames using DinoVd'eau model. GPS information: The data was processed with a PPK workflow to achieve centimeter-level GPS accuracy. Base : Files coming from rtk a GPS-fixed station or any static positioning instrument which can provide with correction frames. Device GPS : Emlid Reach M2 Quality of our data - Q1: 90.92 %, Q2: 8.39 %, Q5: 0.7 % Bathymetry The data are collected using a single-beam echosounder ETC 400. We only keep the values which have a GPS correction in Q1. We keep the points that are the waypoints. We keep the raw data where depth was estimated between 0.2 m and 40.0 m deep. The data are first referenced against the WGS84 ellipsoid. At the end of processing, the data are projected into a homogeneous grid to create a raster and a shapefiles. The size of the grid cells is 0.123 m. The raster and shapefiles are generated by linear interpolation. The 3D reconstruction algorithm is ballpivot. Generic folder structure YYYYMMDD_COUNTRYCODE-optionalplace_device_session-number ├── DCIM : folder to store videos and photos depending on the media collected. ├── GPS : folder to store any positioning related file. If any kind of correction is possible on files (e.g. Post-Processed Kinematic thanks to rinex data) then the distinction between device data and base data is made. If, on the other hand, only device position data are present and the files cannot be corrected by post-processing techniques (e.g. gpx files), then the distinction between base and device is not made and the files are placed directly at the root of the GPS folder. │ ├── BASE : files coming from rtk station or any static positioning instrument. │ └── DEVICE : files coming from the device. ├── METADATA : folder with general information files about the session. ├── PROCESSED_DATA : contain all the folders needed to store the results of the data processing of the current session. │ ├── BATHY : output folder for bathymetry raw data extracted from mission logs. │ ├── FRAMES : output folder for georeferenced frames extracted from DCIM videos. │ ├── IA : destination folder for image recognition predictions. │ └── PHOTOGRAMMETRY : destination folder for reconstructed models in photogrammetry. └── SENSORS : folder to store files coming from other sources (bathymetry data from the echosounder, log file from the autopilot, mission plan etc.). Software All the raw data was processed using our worflow. All predictions were generated by our inference pipeline. You can find all the necessary scripts to download this data in this repository. Enjoy your data with SeatizenDOI!本数据集由自主水面载具（Autonomous Surface Vehicle）于2022年10月21日在塞舌尔阿尔达布拉-ARM01海域采集。 科研人员或公众采集的水下与航空影像具备广泛应用场景，可服务于科学研究、资源管理与生态保护领域。此类影像经标注后可共享，用于训练人工智能（AI）模型以实现影像内目标的自动识别。本团队提供一套软硬件工具集，可完成海洋数据采集、物种/生境预测及地图生成工作。 本数据集隶属于涵盖大量水下与航空影像的大型数据集Seatizen Atlas，相关研究方法、工具及科学目标已在专属数据论文中详述。 图像采集 本次采集任务包含12.98 GB的MP4格式文件，已被剪辑为4996帧（帧率为2997/1000 fps）。 所有帧均已完成地理配准。 根据雅克模型（Jacques model）的预测结果，提取影像中99.28%为有效帧，0.72%为无效帧。 针对有效帧已使用DinoVd'eau模型完成多标签预测。 GPS信息 本数据采用后处理运动学（PPK）工作流处理，以实现厘米级全球定位系统（GPS）定位精度。 基准站数据：来自实时动态差分（RTK）固定GPS基站或可提供校正帧的静态定位设备的文件。 设备GPS：Emlid Reach M2 数据质量分布：Q1占比90.92%，Q2占比8.39%，Q5占比0.7% 测深数据 本数据采用单波束测深仪ETC 400采集。 仅保留带有Q1级GPS校正的测深值。 仅保留航点处的测点数据。 保留水深估算值介于0.2米至40.0米之间的原始数据。 数据最初以WGS84椭球面为参考基准。 处理完成后，数据被投影至统一网格以生成栅格文件与形状文件（shapefiles）。 网格单元尺寸为0.123米。 栅格文件与形状文件通过线性插值生成，三维重建算法采用球枢算法（ballpivot）。 通用文件夹结构 YYYYMMDD_国家代码-[可选地点]_设备_任务编号 ├── DCIM：用于存储采集所得视频与照片的文件夹。 ├── GPS：用于存储所有定位相关文件的文件夹。若文件可通过相关校正手段处理（例如基于RINEX数据的后处理运动学校正），则需区分基准站数据与设备数据；若仅存在设备位置数据且无法通过后处理技术校正（例如GPX文件），则无需区分基准站与设备数据，文件直接存放于GPS文件夹根目录。 │ ├── BASE：来自RTK基站或静态定位设备的文件。 │ └── DEVICE：来自采集设备的文件。 ├── METADATA：存储本次任务通用信息文件的文件夹。 ├── PROCESSED_DATA：用于存储当前任务数据处理结果的所有子文件夹。 │ ├── BATHY：从任务日志中提取的测深原始数据的输出文件夹。 │ ├── FRAMES：从DCIM文件夹视频中提取的地理配准帧的输出文件夹。 │ ├── IA：图像识别预测结果的存储目录。 │ └── PHOTOGRAMMETRY：摄影测量（photogrammetry）重建模型的存储目录。 └── SENSORS：用于存储其他来源文件的文件夹（例如测深仪采集的测深数据、自动驾驶仪日志文件、任务规划文件等）。 软件工具 所有原始数据均通过本团队开发的工作流处理，所有预测结果均由本团队的推理流水线生成。你可在本代码仓库中获取下载该数据集所需的全部脚本。愿你在SeatizenDOI的支持下顺利使用本数据集！