SA GRAVITY 2023 is the 2023 Bouguer gravity grid of South Australia, gridded from 802,178 ground gravity stations from a total of 889,282 stations, extracted from the South Australian gravity database. All open file surveys processed to December 2022 were included in the grid. Duplicate stations and stations interpreted as unsuitable for gridding were not included in the processing. The Bouguer anomaly calculation used a spherical cap model, and the primary units of the grid are µm/sec2.
The gridding process utilised the supervised variable density gridding methodology (Katona 2017), which preserves the optimal grid resolution of both coarse and fine spaced gravity stations, smoothly merging variable station densities to a final grid with 100m cell size. The resulting grid is free of gridding artefacts and is robust enough for vertical gradient filtering.
The 2023 gravity data package includes these data products: -Grids at 100m, 200m, 400m and 800m cell size, all clipped to the same extent as the 2022 series of SA TMI grids, in GDA2020 and GDA94 coordinate systems, Lambert Conformal Conic projection, ers format.
-Filtered grid products derived from the 100m grid including 1st vertical derivative (1VD), upward continuation (1000m) and a residual grid derived by subtracting the 1000m upward continued grid from the 100m gravity grid.
-A reliability surface that classifies the gravity station data into nominal station spacing and optimal gridding resolution.
-Additional files enabling seamless use of the grids in a range of popular GIS software.
-The stations used in the gridding process are included in the package as an ESRI File Geodatabase feature class.

Grids interpolated from geo-located survey data are supplied in high precision 32 or 64 bit ERS format, processed to support data analytics.
ESRI layer files are provided for rendered display of ERS grids in ArcGIS.
Images derived from the ERS format grids are provided in 3 band, 8 bit Geotiff format, to support display and illustration.

This supersedes the previous version; ' South Australian regional gravity grids and images, 2016'