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.

本汇编涵盖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」的重力、磁力及船测航线水深数据，已完成平差处理以用于网格化构建。本汇编收录了自20世纪70年代以来澳大利亚地球科学局开展的地球物理调查数据，以及其他机构的相关调查数据。平差处理可消除不同年代交叉测线调查间的系统偏差，使数据能够被整合并以连续曲面的形式呈现。本汇编由按调查项目组织的时间索引ASCII固定格式文件组成，记录间距约为150米。每个调查项目文件均包含地理坐标、位场及水深数据，涵盖未平差（即Mardat原始数据源格式）与平差后的两类数据。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：本海洋数据的平差工作由Desmond FitzGerald & Associates于1998-2001年间完成，Ron Hackney于2009-2011年间补充完成；最终数据在发布前由Yvette Poudjom Djomani进行了最终审核。