Improved edge detection tools in the interpretation of potential field data
Lili LiCollege of Geoexploration Science and Technology, Jilin University, Changchun 130021, China. Email: lilili815208@sina.com
Exploration Geophysics 44(2) 128-132 https://doi.org/10.1071/EG12058
Submitted: 23 September 2012 Accepted: 14 December 2012 Published: 30 January 2013
Abstract
In this paper, some strategies to improve previous edge detection methods are given, and two different forms of improved theta map filters are presented. These filters use the power transform and the exponential transform of the theta map to recognise the edges of the sources. The new filters are demonstrated on synthetic and measured gravity and magnetic anomalies, and the resolving power of the new filters is tested by comparing the results with those obtained by the conventional theta map filter. The advantage of the new filters lies in their ability to delineate the source edges more clearly.
Key words: improved edge detection, potential field, theta map.
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