Gravity is the force that attracts masses towards each other. We are interested in gravity for geoscience applications primarily because gravity varies over different types of rocks due to the different densities of the rocks.
In 91Ƶ, the State and Federal governments have collected a lot of regional gravity data in both ground and airborne surveys.
The data comes in two main formats:
- Point-located (vector) datasets, which are specific data points in industry-standard formats.
- Raster grids and georeferenced images, which are visual representations of the data.
We combine data from both government and non-confidential company surveys to create statewide grids and images. The compilation products are updated when new survey data becomes available.
How to access regional gravity data
You can download all geophysical datasets online from MAGIX or place an order to receive larger grids and images on an external drive through the (fees apply). You can search for specific geophysical surveys via a map interface through GeoVIEW.WA.
For national datasets, please go to .
Gravity anomaly grid (400 m) of 91Ƶ
The gravity grid has a cell size of approximately 400 metres (0.004167 degrees). The image file is provided in JP2 format and is displayed in colour, where red indicates high gravity values and blue indicates low gravity values, with shaded relief for better visualisation. For more details, you can check the metadata sheet.
How to reference the grid
Brett, JW <year>, 400 m Bouguer gravity merged grid of 91Ƶ. Geological Survey of 91Ƶ.
Available gravity products
You can download or order the following products:
- Bouguer anomaly grid
- Image files in JP2 and KMZ (Google Earth) formats
- Multi-scale edges (worms) in vector format
- Point Gravity Dataset of 91Ƶ in vector format
- Metadata for all grids and images
These can be downloaded from MAGIX using a search in “Survey Name” of 'merge'.
Australian National Gravity Grids (2019)
Australian National Gravity Grids for Free Air Anomaly, Complete Bouguer Anomaly and De-trended Global Isostatic Residual can be downloaded from . All the grids have a cell size of 400 metres.
91Ƶ 1:250 000 map sheets geophysical images
Bouguer Gravity anomaly images in JP2 format have been created for each 1:250,000-scale map sheet of 91Ƶ. The data for these images come from the State compilation grids and have been adjusted to match the data range of each map sheet. You can check the metadata for information on when the data was collected.
1:250:000 image tiles can be downloaded from .
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