Yathong Magnetic Gradient and Radiometric Survey, NSW, 2023, (P5023), gradient enhanced total magnetic intensity, reduced to pole grid

TOTAL MAGNETIC INTENSITY
Total Magnetic Intensity (TMI) data measures variations in the intensity of the Earth's magnetic field, which includes the fields associated with the Earth's core and the magnetism of rocks in the Earth's crust. The data are 'reduced' to highlight those variations caused by the geology in the Earth's crust. TMI data can be used to interpret sub-surface geological structure and has applications in mineral, energy and groundwater studies.

GRADIENT ENHANCED GRID
The data for this grid were acquired as part of a horizontal magnetic gradient survey, which uses three alkali-vapour magnetometers to measure longitudinal and transverse gradients. These gradients allow for a 'gradient enhanced' grid of the TMI data to be produced with improved near-surface information and reduced noise (such as that arising from diurnal changes in the magnetic field).

REDUCTION TO POLE
A Reduction to Pole (RTP) is applied to this grid to locate anomalies above the causative bodies, removing asymmetry caused by the inclination of the Earth's magnetic field. An RTP assumes that the anomalies are caused by induced magnetism (and remanent magnetism is not significant).

GRID METADATA
Units: Nanotesla (nT);
Cell size: 40 m ( degrees);
Datum: EPSG:7844
Processing: Gradient enhanced + RTP.

LINE METADATA
Line spacing: 200 m;
Line direction: 90 degrees;
Total line-kilometres: 65504 km;
Nominal flying height (above ground level): 80 m;
Acquisition Start Date: 2023-05-21;
Acquisition End Date: 2023-09-14;