In 2018, Sander Geophysics Limited (SGL) conducted six fixed-wing high-resolution gravimetric surveys for Geoscience Australia and the Geological Survey of Western Australia. Over two hundred flights were flown to complete the planned 175,825 line kilometres, with five blocks acquired within 800 km to the northeast of Laverton and one block within 500 km to the west of Kununurra (Kimberley Basin block). The survey was flown with two aircraft utilising SGL’s airborne gravity system, Airborne Inertially Referenced Gravimeter (AIRGrav).
The survey was funded by the Department of Mines, Industry Regulation and Safety (DMIRS) Western Australia, and managed by Geoscience Australia.
Survey Name: Warburton East, Warburton West, Great Victoria Desert, Kimberley Basin, Little Sandy Desert East and Little Sandy Desert West Gravity Surveys, 2018
State/Territory: Western Australia
Datasets Acquired: Airborne gravity, elevation
Geoscience Australia Project Numbers: P1312, P1313, P1315, P1316, P1317, P1318 (in the survey order above)
Acquisition Start Date: 27 April 2018
Acquisition End Date: 04 October 2018
Flight line spacing: 2,500m
Flight line direction: East-West for Sandy Desert East and West, Kimberley Basin and Warburton East surveys, North-South for Warburton West and Great Victoria Desert surveys
Tie line spacing: 25,000 m
Tie line direction: Orthogonal to flight lines
Nominal terrain clearance: Smoother drape with nominal 160 m terrain clearance
Total distance flown: 175,825 km
Data projection: MGA51 or MGA52 using the GDA94 datum
Aircraft type: Fixed wing Cessna Grand Caravan 208B
Data Acquisition: Sander Geophysics Limited
Project Management: Geoscience Australia
Quality Control: Geoscience Australia
Dataset Ownership: Western Australia Department of Mines, Industry Regulation and Safety, and Geoscience Australia
Data package for the 6 sub surveys:
- Contractors Report (combined)
- Line data in XYZ and ASEG GDF format
- Read me files of datasets
- Quality control reports for each survey area
- Gridded data with details below
GRIDS
Datum: GDA94
Projection: MGA 51 or MGA 52
Grid cell size: 500m
Formats: Grid Exchange File (.gxf) and ERMapper (.ers)
Name Units Description
-------------- --------- ----------------------------------------------
GRVFAL5000M µms-2 Free air gravity, 5000 m (#) full wavelength spatial filter
FVDFAL5000M Eotvos First vertical derivative of free air gravity, 5000 m (#) full wavelength spatial filter
GRVBGL5000M_267 µms-2 Full Bouguer gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density
FVDBGL5000M_267 Eotvos First vertical derivative of full Bouguer gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density
GRVISO5000M_267 µms-2 Isostatic residual gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density
FVDISO5000M_267 Eotvos First vertical derivative of isostatic residual gravity, 5000 m (#) full wavelength spatial filter, 2670 kg/m3 density
TERRAIN m Laser terrain (above GDA94 Ellipsoid)
BAREEARTH m Bare earth terrain (above GDA94 Ellipsoid)
5000 m wavelength filter employed for all projects other than Little Sandy Desert West where a 2500 m wavelength filter was employed instead. Read contractors report for more details
