IN2024_V01 Southern Ocean Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2024_V01 titled "Multidisciplinary Investigations of the Southern Ocean (MISO): Linking physics, biogeochemistry, plankton, aerosols, clouds and climate". The voyage took place between January 5 and March 5, 2024, departing from Hobart (TAS) and arriving in Fremantle (WA).\n\nThe purpose of the voyage was: \n1. To collect integrated physical, biogeochemical, and biological observations of the coupled Southern Ocean – atmosphere system needed to address gaps in scientific understanding of key processes and to understand reasons for biases in Earth System Models (ESMs). \n2. To use enhanced process-level understanding and observations to test and improve earth system models and for calibration/validation of satellite measurements. \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 Southern Ocean, produced from the processed EM122 and EM710 bathymetry data.\n\nLineage: Multibeam data was logged from the EM’s in Kongsberg’s proprietary *.all format and was converted to be processed within CARIS HIPS and SIPS version 11.4.30. Data were imported into the HIPS project using EM Height and the vessel file appropriate for either the EM122 or EM710. GPS tide was computed using the EGM2008 model EGM_2008_1Min_Aust_WGS84.csar. TPU values were computed using Measured Sound Velocity = 0.5 and Surface Sound Velocity = 0.2. The raw files were analysed for noise and cleaned manually. The data was then gridded at the highest resolution possible and further inspected for outliers.\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.

本图层组描述的是"RV Investigator"号科考船IN2024_V01航次采集的多波束测深声呐数据，航次主题为"南大洋多学科调查（MISO）：连接物理、生物地球化学、浮游生物、气溶胶、云与气候"。本航次执行于2024年1月5日至3月5日，从霍巴特（塔斯马尼亚州）启航，最终抵达弗里曼特尔（西澳大利亚州）。

本航次的研究目标如下：
1. 采集南大洋-大气耦合系统的综合物理、生物地球化学与生物学观测数据，以填补当前科学认知中关键过程的研究空白，并解析地球系统模式（Earth System Models, ESMs）存在偏差的根源。
2. 依托深化的过程级认知与实地观测数据，测试并改进地球系统模式，同时为卫星测量提供校准与验证依据。

本数据集经澳大利亚联邦科学与工业研究组织（CSIRO）许可发布，不得用于导航用途。

本数据集包含分辨率区间为10米至210米的南大洋水深栅格数据，由经过预处理的EM122与EM710型多波束测深数据生成。

数据溯源流程如下：多波束原始数据以康斯伯格（Kongsberg）专有格式*.all存储，随后转换为可在CARIS HIPS and SIPS 11.4.30版本中开展处理的格式。通过EM Height工具及适配EM122或EM710的船载配置文件，将数据导入HIPS项目。采用EGM2008模型（EGM_2008_1Min_Aust_WGS84.csar）计算GPS潮汐修正量。声速参数设置为：实测声速=0.5，表面声速=0.2，据此计算TPU值。对原始文件进行噪声筛查并实施手动降噪处理。随后以最高可行分辨率完成网格化，并对数据进行异常值排查。

后续使用Python编写的CARIS批处理脚本，依据AusSeabed多波束指南v2中制定的"水深-分辨率"筛选规则，以多种分辨率对数据进行网格化重处理，并再次开展异常值检查。最终栅格产品可在本数据集的L3文件夹中获取。按航段处理的原始数据还将以GSF与ASCII格式导出，并存放在本数据集的L2文件夹中。