IN2017_V03 Australian Eastern Continental Margin Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2017_V03 titled "Sampling the abyss: latitudinal biodiversity patterns along the base of Australia’s eastern continental margin". The voyage took place between May 15 and June 16, 2017, departing from Hobart (TAS) and arriving in Brisbane (QLD).\n\nThe purpose of this voyage was to sample the biodiversity of lower bathyal (2500 m) and abyssal (4000 m) seafloor habitats off south-eastern Australia, and in particular deep-water ecosystems of seven Commonwealth marine reserves.\n\nThis dataset is published with the permission of CSIRO. Not to be used for navigational purposes.\n\nThe dataset contains bathymetry grids of 10m to 210m resolution of the GeographicLocation produced from the processed EM122 and EM710 bathymetry data.\n\nLineage: Multibeam data was logged from the EMs in Kongsberg’s proprietary *.all format and was converted to be processed within Caris HIPS and SIPS version 9.1.2. The project was set up using a World Mercator projection. Once the raw files were converted into the HIPS and SIPS format the data was analysed for noise. Zerotide was applied, and the lines were merged using the vessel file appropriate for either the EM122 or EM710. \n\nThe data was then gridded at multiple resolutions in python Caris batch script using a Depth filter Vs Resolution guideline derived from AusSeabed Multibeam guidelines v2 and further inspected for outliers. Final raster products are available in L3 folder of this collection. Final processed data were also exported per line as GSF and ASCII format and available in the L2 folder of this collection.\n

本图层组描述了基于“调查者号”（RV Investigator）科考航次IN2017_V03采集的多波束测深仪（multibeam echosounder）数据，该航次主题为“探秘深渊：澳大利亚东部大陆坡基部的纬度生物多样性格局”。本次科考航次于2017年5月15日至6月16日开展，从塔斯马尼亚州（TAS）霍巴特港起航，最终抵达昆士兰州（QLD）布里斯班港。

本次航次的核心目标为采集澳大利亚东南部海域半深海（2500米级）与深海（4000米级）海底生境的生物多样性样本，重点针对7个英联邦海洋保护区内的深水生态系统开展采样工作。

本数据集经联邦科学与工业研究组织（CSIRO）许可发布，禁止用于导航用途。

本数据集包含基于处理后的EM122与EM710多波束测深数据生成的研究海域水深栅格产品，栅格分辨率覆盖10米至210米区间。

数据溯源：多波束数据由康斯伯格（Kongsberg）旗下多波束系统以专属*.all格式记录，随后被转换至Caris HIPS与SIPS 9.1.2版本软件中开展处理。本项目采用世界墨卡托投影坐标系搭建。原始文件转换至HIPS与SIPS格式后，首先对数据开展噪声分析，随后应用Zerotide工具进行降噪处理，再通过适配EM122或EM710测深系统的船舶文件完成测线合并。

随后基于澳大利亚海底测绘多波束指南v2（AusSeabed Multibeam guidelines v2）制定的水深滤波与分辨率匹配准则，通过Caris Python批处理脚本将数据生成多分辨率栅格，并进一步对栅格数据开展异常值排查。最终栅格产品可在本数据集的L3文件夹中获取。此外，经处理的原始测线数据已按单条测线导出为GSF与ASCII格式，存放在本数据集的L2文件夹中。