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The CET Grid Analysis extension consists of a number of tools that provide automated lineament detection of gridded data, which can be used for first-pass data processing.
The CET Grid Analysis extension provides a rapid unbiased workflow that reduces time when interpreting large volumes of gridded data.
The extension contains tools for texture analysis, phase analysis, and structure detection. These are versatile algorithms useful for grid texture analysis, lineament detection, edge detection, and thresholding.
Useful for highlighting local intensity variations, this method enhances regions of discontinuity within aeromagnetic/gravity datasets. Trends are found in the data by identifying regions of textural complexity in the local magnetic response before looking for axes of symmetry. Such axes are likely to be distinct linear discontinuities in the signal.
Regions of magnetic gravity discontinuity usually correspond with, and can reveal, lithology boundaries, faults, and dykes critical to understanding the geology of an area.
Using the texture analysis output, it finds the skeletal structure of the regions of the magnetic/gravity discontinuity. The output is a set of binary skeletal line segments that belong to each of the discontinuity regions, clearly showing the changes of orientations and offsets within the structures."
The process uses the following techniques:
This approach applies phase-based edge detection directly to data to find edges whose noise characteristics and poor contrast limit the effectiveness of traditional gradient based approaches. As an alternative method of identifying linear discontinuities, edge detection can be performed directly on magnetic or gravity data. Using a phase-based approach will ensure that even features lying in low contrast regions will be detected.
This process emulates the traditional manual drawing of interpretive lines along the discontinuity. This includes:
CET Grid Analysis was developed by the Centre for Exploration Targeting (CET). It is licensed and distributed by Geosoft as an Oasis montaj plus third party extension.
|Dynamic Range Compression||
CET Grid Analysis now includes a Phase Preserving Dynamic Range Compression filter. The filter is designed to reveal subtle features within images with a high dynamic range such as aeromagnetic or other potential field grids. The filter provides you with a fast and easy method of emphasizing and viewing structures with different wavelengths, helping you with interpretation. Grids for a multiple range of scales may be created simultaneously based on wavelengths of interest.
See full release notes for Oasis montaj 8.0
Barrick Gold, The University of Western Australia, Centre for Exploration Targeting (CET)