Reef Flat surveys using the ReefScan survey system for the ecoRRAP project

Data from the ReefScan image survey system for reef flats along the Great Barrier Reef for the ecoRRAP project. The ReefScan survey system consists of a series of GoPro cameras mounted on an underwater boom either side of a small Tender which then undertakes surveys of reef flat areas of reefs. The surveys are typically 0.5Ha in area (100m x 50m) located over the top of the shallow ecoRRAP sites with the intent to include all of the area of the ecoRAPP DSRL camera surveys and to include the reef edge and reef flat.The images are geo-located and so can be stitched using the Metashape software (www.agisoft.com) into Ortho-mosaics, the data is also processed into 2.5D DEM's and object clouds which can be used to get structural information. As the data is colelcted at the surface it has some depth information and so best represents 2.5D over true 3D.The images can also be analysed using Machine Learning to give percent cover of the major benthic forms. One compoent of the work is to develop and validate a set of classificaiton labels suitable for the data collected.Surveys were done over 2021 and 2022 as part of the Technology Development work with the techniques evolving as the work progressed. The first survey was incomplete and some of the ecoRAPP trips were not surveyed using this system.The following trips have been completed:    Orpheus / Pelorus Island and Davies Reef I [Jan 2021] (partial survey)    Torres Strait (Dunganess / Masig / Aukane) [Feb 2021]    Moore Reef / Lizard Island [Oct 2021]    Orpheus / Pelorus Island / Davies Reef / Chicken Reef / Little Boardhurst Reef II [Jan 2022]    Davies post-bleaching and Southern Reefs (Heron, Lady Muscgrave) [March 2022]The core data are sets of geo-located GoPro images of shallow reef areas with a high degree of overlap. The data products derived from these include:    Orth-mosaic images either a GeoTIFFs or as GeoServer layers    Digital Elevation Models (DEM's) showing elevation / bathymetry as GeoTIFFs    Point Clouds or 3D/2.5D models (as obj files)    Percent cover estimates from the images via Machine Learning modelsEach survey will have a child metadata record to this parent record.

本数据集为ecoRRAP项目针对大堡礁沿岸礁坪开展的ReefScan图像调查系统（ReefScan）采集的数据。ReefScan调查系统由搭载于小型工作艇两侧水下吊杆上的一系列GoPro相机（GoPro）组成，随后对珊瑚礁的礁坪区域开展调查。调查区域通常为0.5公顷（100米×50米），设置于浅海ecoRRAP调查站点上方，旨在覆盖ecoRAPP DSRL相机调查的全部区域，同时涵盖礁缘与礁坪区域。所采集图像均带有地理坐标，可通过Metashape软件（www.agisoft.com）拼接为正射影像镶嵌图；数据还可处理为2.5维数字高程模型（DEM）与点云数据，用于提取珊瑚礁结构信息。由于数据在水面采集，因此带有部分深度信息，更适合以2.5维形式呈现而非纯三维模型。此外，还可通过机器学习对图像进行分析，以获取主要底栖生物类群的覆盖百分比。本项目的一项核心工作为开发并验证一套适用于该数据集的分类标签体系。

调查工作于2021至2022年间开展，属于技术开发类工作，相关技术随项目推进不断迭代。首次调查未完成，部分ecoRAPP航次未采用该系统开展调查。已完成的航次如下：
奥菲斯岛/佩洛鲁斯岛与戴维斯礁I [2021年1月]（部分调查）
托雷斯海峡（邓甘尼斯岛/马西格岛/奥卡内岛）[2021年2月]
穆尔礁/蜥蜴岛 [2021年10月]
奥菲斯岛/佩洛鲁斯岛/戴维斯礁/鸡礁/小伯德赫斯特礁II [2022年1月]
戴维斯礁白化后调查与南部礁群（赫伦岛、拉迪·马斯格雷夫岛）[2022年3月]

本数据集的核心为一系列带有地理坐标的GoPro相机拍摄的浅海珊瑚礁区域图像，图像间重叠度较高。由此衍生的数据产品包括：
正射影像镶嵌图，格式为GeoTIFF或GeoServer图层
展示高程/水深的数字高程模型（DEM），格式为GeoTIFF
点云数据或3D/2.5维模型（obj文件格式）
通过机器学习模型从图像中提取的底栖生物覆盖百分比估算结果

每一项调查都会对应一条隶属于该父级记录的子元数据记录。