Marine Gravity, Magnetic and Bathymetry Levelled Line Data in the Australian Region

This compilation of gravity, magnetic and bathymetry ship-track line data, derived from the Geoscience Australia marine geophysical survey database 'Mardat', has been levelled in preparation for gridding. Data are included from Geoscience Australia geophysical surveys acquired since the 1970's as well as surveys from other institutions. The levelling process reduces mis ties between intersecting surveys of various vintages so that they can be integrated and represented as continuous surfaces.

The compilation consists of time-indexed ASCII fixed format files organised by survey with a record spacing approximately 150m. Each survey file contains geographic coordinates and the potential field and bathymetry data, both unlevelled (source data as in Mardat) and levelled. The compilation does not include shot-indexed data as may be recorded on seismic reflection surveys.

Note: The marine data was levelled by Desmond FitzGerald & Associates from 1998-2001, and Ron Hackney in 2009-2011. The final data were further reviewed by Yvette Poudjom Djomani prior to the release.

本数据集为重力、磁测与船舶航迹线水深测量数据集汇编，源自澳大利亚地球科学局（Geoscience Australia）海洋地球物理调查数据库"Mardat"，已完成平差处理以用于后续网格化作业。数据集涵盖了澳大利亚地球科学局1970年代以来获取的地球物理调查数据，以及其他机构的相关调查数据。

平差流程可消除不同年代相交调查航线间的不符值，从而实现数据整合并生成连续的场表面。

本次汇编采用按调查任务组织的时间索引ASCII固定格式文件，记录间距约为150米。每份调查任务文件包含地理坐标、位场与水深测量数据，同时提供未平差（即"Mardat"数据库中的原始源数据）与已平差两种版本。本汇编不包含地震反射调查中通常记录的炮点索引数据。

注意：本海洋数据集的平差工作由Desmond FitzGerald & Associates于1998-2001年间、Ron Hackney于2009-2011年间完成，最终数据在公开发布前经Yvette Poudjom Djomani复核。