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GSNSW Batemans Bay Narooma magnetic rtp grid geodetic

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Created 14/01/2025

Updated 14/01/2025

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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 0.00049 degrees (approximately 50m).The data are in nanoTesla (or nT). The data used to produce this grid was acquired in 1998 by the NSW Government, and consisted of 7792 line-kilometres of data at 250m 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.

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Title GSNSW Batemans Bay Narooma magnetic rtp grid geodetic
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/8dbb7bf2-eff5-411c-a6c4-ddd815583d79
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 01/12/1998 - 30/12/1998
Geospatial Coverage {"type": "Polygon", "coordinates": [[[149.8294, -36.3133], [150.4151, -36.3133], [150.4151, -35.4586], [149.8294, -35.4586], [149.8294, -36.3133]]]}
Data Portal data.gov.au