MH370 Phase 1 Optimal Bathymetry datasets (GA-4421, GA-4422 and GA-4430)

On behalf of Australia, the Australian Transport Safety Bureau (ATSB) is leading search operations for missing Malaysian airlines flight MH370 in the Southern Indian Ocean. Geoscience Australia provided advice, expertise and support to the ATSB to facilitate bathymetric surveys, which were undertaken to provide a detailed map of the sea floor topography to aid navigation during the underwater search.
Bathymetric data was acquired by multibeam sonar mounted on the hull of multiple vessels (GA survey reference: GA-4421, GA-4422 & GA-4430). Bathymetric surveys were conducted from June 2014 to February 2017, collecting over 710,000 square kilometres of data in the search area and along transit lines (to and from the search area).
This dataset allows exploration of the seafloor topography through an optimal resolution compilation of tiles across the search and transit areas of the Southern Indian Ocean. The dataset is overlain on a hillshade created from the Optimal resolution bathymetry data. The hillshade was created with the parameters of point illumination azimuth at 45 degrees and altitude of 45 degrees.

代表澳大利亚，澳大利亚交通安全局（Australian Transport Safety Bureau, ATSB）牵头开展南印度洋失联马来西亚航空MH370航班的搜寻作业。澳大利亚地球科学局（Geoscience Australia）为ATSB提供咨询服务、专业技术支持与协作保障，以推进水深测量（bathymetric survey）作业——该作业旨在绘制高精度海底地形地图，为水下搜寻阶段的航行提供辅助。
本次水深数据由搭载于多艘作业船体的多波束声呐（multibeam sonar）采集，勘测编号为GA-4421、GA-4422及GA-4430。水深测量作业于2014年6月至2017年2月间开展，在搜寻区域及往返该区域的航线上共采集超过71万平方公里的勘测数据。
本数据集通过对南印度洋搜寻区域与往返航线区域的最优分辨率栅格瓦片进行整合拼接，可实现海底地形的可视化探索与分析。该数据集叠加于基于最优分辨率水深数据生成的地貌晕渲图（hillshade）之上，该晕渲图采用方位角45度、高度角45度的点光源照明参数制作完成。

搜集汇总

背景与挑战

背景概述

该数据集包含MH370 Phase 1 Bathymetry数据(GA-4421, GA-4422和GA-4430)，由Geoscience Australia提供，用于支持MH370航班的搜索行动。数据通过多波束声纳技术采集，详细绘制了南印度洋的海底地形，以辅助水下搜索的导航工作。