Heard and MacDonald Islands (HIMI) multibeam and single beam bathymetry compilation

This record describes collated multibeam and single beam datasets for Heard Island and McDonald Island (HIMI). The dataset was generated for FRDC Project No 2019-169 using a combination of available multibeam (MBES) data (CSIRO RV Investigator), single beam (SBES) data, and existing background bathymetry products. The compiled dataset includes MBES data from RV Investigator voyages IN2016_V01 and IN2020_V01. The SBES data was collected by fishing vessels and the data made available through the FRDC project. Background datasets used include the GEBCO 2022 Grid (GEBCO Compilation Group, 2022) and the AusBathyTopo (Kerguelen Plateau) 100m 2022 - A regional-scale depth model (Beaman, R.J., 2022).\n\nThe final product is a compiled and interpolated bathymetry surface for HIMI at 200 m resolution (World Mercator projection) in GeoTIFF format. \n\nNB: Combining datasets from various sources, such as SBES, MBES and satellite derived, will result in artefacts due to the differences in resolution and accuracy of each of these systems.\n

本记录描述了针对赫德岛与麦克唐纳群岛（Heard Island and McDonald Island, HIMI）的整合多波束与单波束数据集。本数据集为渔业研究与发展公司（FRDC）2019-169号项目编制，整合了已获取的多波束测深系统（multibeam echosounder, MBES）数据（由澳大利亚联邦科学与工业研究组织CSIRO RV '探索者'号采集）、单波束测深系统（single beam echosounder, SBES）数据，以及现有背景水深产品。本次整合得到的数据集包含RV '探索者'号两次科考航次IN2016_V01与IN2020_V01采集的多波束测深数据。单波束测深数据由渔船采集，并通过FRDC项目对外公开。所用背景数据集包括全球海洋水深图（General Bathymetric Chart of the Oceans, GEBCO）2022网格数据（GEBCO汇编组，2022），以及2022年发布的凯尔盖朗高原区域100米分辨率澳式水深地形模型（AusBathyTopo）（Beaman, R.J., 2022）。最终成果为针对赫德岛与麦克唐纳群岛（HIMI）的整合插值水深曲面，分辨率为200米，采用世界墨卡托投影，存储格式为GeoTIFF。注意：由于不同数据源（如单波束测深数据、多波束测深数据及卫星衍生数据）的分辨率与精度存在差异，整合多源数据集时会产生伪影（artefacts）。