IN2019_T02 Brisbane to Darwin Transit Bathymetry 10m - 210m Multi-resolution AusSeabed products

This layer group describes multibeam echosounder data collected on RV Investigator voyage IN2019_T02 titled "Deep seascapes of the Great Barrier Reef: Uncovering submarine canyons and landslides". The voyage took place between October 4 and October 14, 2019, departing from Brisbane (QLD) and arriving in Darwin (NT).\n\nThe purpose of this voyage was to transit from Brisbane to Darwin and to map the seascapes of the Great Barrier Reef, uncovering submarine canyons and landslides. \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 Brisbane to Darwin Transit produced from the processed EM122 and EM710 bathymetry data.\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 10.3.1. Initial data conversion and processing was performed using the GSM python batch utility. GPS height was set to GGK and TPU was calculated using values of Measured Tide: 0.1 SV Measured: 0.1 and SV Surface: 0.5. Once the raw files were converted into the HIPS and SIPS format the data were analysed for noise. Zerotide was applied to most lines, and the lines were merged using the vessel file appropriate for either the EM122 or EM710. The data was then gridded at the highest resolution possible and further inspected for outliers. For the Wessel marine park survey, tide was applied using the file TwoIslandBay_8-15Oct19_MSL.tid, as specified in the processing log. In rare cases, refraction coefficients were applied to correct sound velocity errors, particularly within the Swain slide area.\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（调查号）科考船执行IN2019_T02航次期间采集的多波束测深仪（multibeam echosounder）数据，该航次主题为"大堡礁深海景观：揭秘海底峡谷与滑坡"。本次航次执行时间为2019年10月4日至10月14日，从布里斯班（QLD）出发，最终抵达达尔文（NT）。 本次航次的任务目标为从布里斯班航行至达尔文，并对大堡礁海域的深海景观进行测绘，以揭秘海底峡谷与滑坡地貌。 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。 本数据集包含布里斯班至达尔文航段的水深地形栅格数据，分辨率介于10米至210米之间，数据由经过处理的EM122与EM710型水深测量数据生成。 数据溯源：多波束数据由EM系列测深仪采集，存储为康斯贝格（Kongsberg）专有格式*.all文件，后续在CARIS HIPS与SIPS 10.3.1版本软件中完成处理。初始数据转换与处理通过GSM Python批处理工具完成。GPS高程设置为GGK基准，总传播不确定度（TPU）通过以下参数计算：实测潮汐0.1 SV、实测值0.1及表层SV 0.5。原始文件转换为HIPS与SIPS格式后，对数据进行噪声分析。对绝大多数测线应用零潮汐校正（Zerotide），并使用适配EM122或EM710测深仪的船舶文件完成测线拼接。随后以最高可行分辨率对数据进行栅格化处理，并进一步排查异常值。针对Wessel海洋公园测绘区域，按照处理日志要求，使用TwoIslandBay_8-15Oct19_MSL.tid文件完成潮汐校正。仅在极少数情况下，应用折射系数修正声速误差，尤其是在斯温滑坡（Swain slide）区域。 随后基于AusSeabed多波束测绘指南v2（AusSeabed Multibeam guidelines v2）制定的水深滤波与分辨率对应规则，通过Python编写的CARIS批处理脚本对数据进行多分辨率栅格化处理，并再次排查异常值。本数据集集合的L3文件夹中提供最终栅格产品。此外，经处理的单条测线数据已导出为GSF与ASCII格式，存放在L2文件夹中。