2019 B-Series De-trended Global Isostatic Residual Gravity Map of Australia

The main part of this map is a Hue-Saturation-Intensity (HSI) image of De-trended Global Isostatic Residual Gravity data (DGIR) based on the B Series of the 2019 Australian National Gravity Grids. This series of grids represent the combination of 1.4 million ground gravity observations stored in the Australian National Gravity Database (ANGD) as of September 2019; 345,000 line km of Airborne Gravity and 106,000 line km of gravity gradiometry data in the National Australian Geophysical Database (NAGD), and the Global Gravity Grid developed at Scripps Institution of Oceanography, University of California at San Diego using data from the United States SIO, NOAA and NGA. The ground and airborne gravity data have been acquired by the Commonwealth, State and Territory Governments, the mining and exploration industry, universities and research organisations from the 1940’s to the present day.

The shading of the image is from the northwest and the colour scale is linear from -500 µm.s-2 (blue) to +500 µm.s-2 (red).

本地图的主体为基于2019年澳大利亚国家重力网格B系列的去趋势全球均衡剩余重力数据（De-trended Global Isostatic Residual Gravity data, DGIR）的色调-饱和度-明度（Hue-Saturation-Intensity, HSI）影像。该系列网格整合了三类数据源：截至2019年9月存储于澳大利亚国家重力数据库（Australian National Gravity Database, ANGD）中的140万项地面重力观测数据；收录于澳大利亚国家地球物理数据库（National Australian Geophysical Database, NAGD）的34.5万线公里航空重力数据与10.6万线公里重力梯度数据；以及由加利福尼亚大学圣迭戈分校斯克里普斯海洋研究所（Scripps Institution of Oceanography, SIO）依托美国斯克里普斯海洋研究所、美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）与美国国家地理空间情报局（National Geospatial-Intelligence Agency, NGA）的数据研发而成的全球重力网格。上述地面与航空重力数据由澳大利亚英联邦、各州及领地政府、矿业与勘探行业、高校及科研机构自20世纪40年代起至今采集获取。
该影像采用西北向光影晕渲，色标为线性比例尺，数值范围为-500 微米·秒⁻²（蓝色）至+500 微米·秒⁻²（红色）。