Innovation In Geophysical Gridding Techniques: Intrepid Perspective

A wide variety of numerical procedures in potential field geophysics require data<br>modelled on a regular grid. However, airborne data tend to be highly sampled<br>along the flight line and sparsely sampled in the perpendicular direction,<br>A gridding method commonly called ‘bi-cubic spline’ is widely used in potential<br>field geophysics. Standard bi-cubic spline methods used on aeromagnetic data<br>produce artefacts when a geological feature’s ‘line of strike’ is not perpendicular<br>to the direction of the acquisition line. This method has a tendency to break up<br>thin elongated magnetic anomalies, at an oblique angle, into a series of bulls eye<br>artifacts. A method of finding local anomalies and their strike along lines based<br>upon minimum variance principles reduces these effects. This technique has<br>significant impact on the quality of output grids.