f3438161-049c-44ba-ade1-30fcd10adf28 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T13:57:51 creation ISO 19115 2016 GSSA Fowler ReducedToPole grid geodetic f3438161-049c-44ba-ade1-30fcd10adf28 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 magnetic grid has a cell size of 0.00042 degrees (approximately 43m).The data are in nanoTesla (or nT). The data used to produce this grid was acquired in 2017 by the SA Government, and consisted of 94903 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. {"type": "Polygon", "coordinates": [[[130.9895, -32.2135], [133.5103, -32.2135], [133.5103, -31.2477], [130.9895, -31.2477], [130.9895, -32.2135]]]} 130.9895 133.5103 -32.2135 -31.2477 Australia EARTH SCIENCES Earth sciences GADDS2.0 NCI Published_External RTP SA TMI airborne digital data geophysical survey geophysics grid mag magnetics magnetism palaeomagnetism raster reduced to the pole survey 1285 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 GSSA Fowler ReducedToPole grid geodetic file download documentDigital File download for GSSA Fowler ReducedToPole grid geodetic application/x-netcdf GSSA Fowler ReducedToPole grid geodetic NCSS documentDigital NetCDF Subsetting Service (NCSS) for GSSA Fowler ReducedToPole grid geodetic HTML GSSA Fowler ReducedToPole grid geodetic OPeNDAP documentDigital OPeNDAP web service for GSSA Fowler ReducedToPole grid geodetic HTML GSSA Fowler ReducedToPole grid geodetic WMS documentDigital OGC Web Mapping Service (WMS) for GSSA Fowler ReducedToPole grid geodetic WMS GSSA Fowler ReducedToPole grid geodetic WCS documentDigital OGC Web Coverage Service (WCS) for GSSA Fowler ReducedToPole grid geodetic WCS