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Dr. Gordon Cooper
School of Geosciences, University of the Witwatersrand, Private Bag X3, Johannesburg P.O. Box Wits 2050, South Africa
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30Years (1997-Present)
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Representative Publications
View All Publications1 December 2006 in Computers & Geosciences
Journal Article
GCGordon Cooper
Gordon CooperDCD.R. Cowan
D.R. Cowan
1 November 2003 in Quaternary Science Reviews
Journal Article
KHKarin Holmgren
Karin Holmgren
JLJulia A. Lee-Thorp
Julia A. Lee-Thorp
GCGordon Cooper
Gordon CooperKLKatarina Lundblad
Katarina Lundblad
TPTimothy C. Partridge
Timothy C. Partridge
PTPeter D. Tyson
Peter D. Tyson
+3
1 January 2008 in Geophysics
Journal Article
GCGordon Cooper
Gordon CooperDCDuncan R. Cowan
Duncan R. Cowan
Edge enhancement in potential-field data helps geologic interpretation. There are many methods for enhancing edges, most of which are high-pass filters based on the horizontal or vertical derivatives of the field. Normalized standard deviation (NSTD), a new edge-detection filter, is based on ratios of the windowed standard deviation of derivatives of the field. NSTD is demonstrated using aeromagnetic data from Australia and gravity data from South Africa. Compared with other filters, the NSTD filter produces more detailed results.
1 February 2008 in Computers & Geosciences
Journal Article
GCGordon Cooper
Gordon CooperDCD.R. Cowan
D.R. Cowan
1 June 2004 in Computers & Geosciences
Journal Article
GCGordon Cooper
Gordon CooperDCD.R Cowan
D.R Cowan
1 January 2009 in Geophysics
Journal Article
GCGordon Cooper
Gordon CooperHorizontal and vertical gradients, and filters based on them (such as the analytic signal), are used routinely to enhance detail in aeromagnetic data. However, when the data contain anomalies with a large range of amplitudes, the filtered data also will contain large and small amplitude responses, making the latter hard to see. This study suggests balancing the analytic signal amplitude (sometimes called the total gradient) by the use of its orthogonal Hilbert transforms, and shows that the balanced profile curvature can be an effective method of enhancing potential-field data. Source code is available from the author on request.
About Me
G.R.J. Cooper is a professor of geophysics at the University of the Witwatersrand, Johannesburg. His areas of research include potential fields, image and signal processing, seismic attributes, and nuclear physics. He is currently an associate editor of the journals Geophysical Prospecting, Near Surface Geophysics, Exploration Geophysics, Computers & Geosciences, and the Arabian Journal of Geoscience, and constantly reviews papers for all the major journals. He has published more than 120 papers in international journals, and also holds five patents. Algorithms that he has developed have been implemented by various commercial geophysical companies. He was the president of the S.A. Geophysical Association from 1997–1998.