3fe378b3-6aec-42d4-a183-340c726e43fc urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T11:53:52 creation ISO 19115 2016 Kingoonya - TMI RTP 1VD grid (AWAGS) 3fe378b3-6aec-42d4-a183-340c726e43fc Total magnetic intensity (TMI) data measures variations in the intensity of the Earth's magnetic field caused by the contrasting content of rock-forming minerals in the Earth crust. Magnetic anomalies can be either positive (field stronger than normal) or negative (field weaker) depending on the susceptibility of the rock. The data are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. . This Kingoonya - TMI RTP 1VD grid (AWAGS) is the first vertical derivative of the TMI RTP grid of the Kingoonya Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey. This grid has a cell size of 0.0004 degrees (approximately 41m) , and given in units of nT per metre (nT/m). The data used to produce the TMI grid was acquired in 2018 by the SA Government, and consisted of 149477 line-kilometres of data at 200m line spacing and 60m terrain clearance. The data has had a variable reduction to the pole applied to centre the magnetic anomaly over the magnetised body. The VRTP processing followed a differential reduction to pole calculation up to 5th order polynomial. Magnetic inclination and declination were derived from the IGRF-11 geomagnetic reference model using a data representative date and elevation representative of the survey. A first vertical derivative was calculated by applying a fast Fourier transform (FFT) process to the TMI RTP grid of the Kingoonya Airborne Magnetic Radiometric and DEM survey, SA, 2018 survey to produce this grid. This grid was calculated using an algorithm from the INTREPID Geophysics software package. This grid shows the magnetic response of subsurface features with contrasting magnetic susceptibilities. The grid can also be used to locate structural features such as dykes. {"type": "Polygon", "coordinates": [[[134.9952, -31.5191], [136.9604, -31.5191], [136.9604, -29.9759], [134.9952, -29.9759], [134.9952, -31.5191]]]} 134.9952 136.9604 -31.5191 -29.9759 1VD Australia EARTH SCIENCES Earth sciences GADDS2.0 NCI Published_External RTP SA TMI airborne digital data first vertical derivative geophysical survey geophysics greyscale grid image mag magnetics magnetism palaeomagnetism reduced to the pole survey 1311 total magnetic intensity File available for download in various formats from the GADDS2 portal documentDigital The Geophysical Archive Data Delivery System (GADDS2) portal provides HTTP download of geophysics datasets in a number of formats. Point and line datasets are available in NetCDF and ASEG-GDF2. Grid datasets are available in NetCDF, GeoTIFF and ERS. HTML Kingoonya - TMI RTP 1VD grid (AWAGS) file download documentDigital File download for Kingoonya - TMI RTP 1VD grid (AWAGS) application/x-netcdf Kingoonya - TMI RTP 1VD grid (AWAGS) NCSS documentDigital NetCDF Subsetting Service (NCSS) for Kingoonya - TMI RTP 1VD grid (AWAGS) HTML Kingoonya - TMI RTP 1VD grid (AWAGS) OPeNDAP documentDigital OPeNDAP web service for Kingoonya - TMI RTP 1VD grid (AWAGS) HTML Kingoonya - TMI RTP 1VD grid (AWAGS) WMS documentDigital OGC Web Mapping Service (WMS) for Kingoonya - TMI RTP 1VD grid (AWAGS) WMS Kingoonya - TMI RTP 1VD grid (AWAGS) WCS documentDigital OGC Web Coverage Service (WCS) for Kingoonya - TMI RTP 1VD grid (AWAGS) WCS