Rainbow massif (Middle Atlantic Ridge 36 14'N): AUV IdefX Microbathymetry and Acoustic Backscatter

Near-bottom multibeam bathymetry and acoustic backscatter acquired at the Rainbow Massif (Mid-Atlantic Ridge). High-resolution bathymetry data (2 m/pixel) were acquired by the autonomous underwater vehicle (AUV) IdefX, deployed during the ARC-EN-SUB (https://doi.org/10.17600/18000663) cruise in May 2022. The dataset consists of grids for each individual AUV dive, as well as a global grid merging the ten completed dives. This global grid was obtained by manually shifting and combining original bathymetric grids of each dive using other datasets (primarily shipboard bathymetry from Paulatto et al. [2015]) for geographical reference. The combined grid shows the inter-dive shift artefacts, absent in the individual dive grids. Elevation grids are provided for each AUV dive without interpolation (fillgap 0), with medium (fillgap 3) and high (fillgap 15) interpolation.Acoustic backscatter grids are edited without interpolation (fillgap 0). All grids are provided in NETCDF GMT .grd format, and with two associated GEOTIFFS with the bathymetry DEM, the acoustic backscatter, and the hillshade (illumination) file. All grids are given in WGS84 (WGS 84 - WGS84 - EPSG:4326), in projection Mercator.

大西洋中脊彩虹海山（Rainbow Massif）区域采集的近底多波束测深（multibeam bathymetry）与声学背散射（acoustic backscatter）数据。高分辨率测深数据（分辨率为2米/像素）由自主水下航行器（autonomous underwater vehicle, AUV）IdefX采集，该设备部署于2022年5月开展的ARC-EN-SUB航次（https://doi.org/10.17600/18000663）中。本数据集包含单次AUV下潜对应的网格数据，以及融合全部10次成功下潜数据的全局网格。该全局网格通过手动偏移并拼接各次下潜的原始测深网格得到，拼接过程以其他数据集（主要参考Paulatto等人[2015]的船载测深数据）作为地理参照基准。拼接后的全局网格会呈现出各次下潜间的偏移伪影，而单次下潜网格则无此类问题。针对每一次AUV下潜，我们提供了无插值（fillgap 0）、中等插值（fillgap 3）以及高强度插值（fillgap 15）三种版本的高程网格数据。声学背散射网格仅经过编辑处理，未进行插值操作（fillgap 0）。所有网格数据均以NETCDF GMT .grd格式存储，同时附带两份与测深数字高程模型（Digital Elevation Model, DEM）、声学背散射数据及晕渲（光照）文件相关的GEOTIFF文件。所有网格均采用WGS84坐标系（WGS 84 - WGS84 - EPSG:4326），投影方式为墨卡托投影。