U.S. Geological Survey Open-File Report 2009-1206
ABSTRACTThis report consists of a thesis submitted to the faculty of the Department of Electrical and Computer Engineering, in partial fulfillment of the requirements for the degree of Master of Science, Graduate College, The University of Arizona, 2004 Aeromagnetic anomaly images are geophysical prospecting tools frequently used in the exploration of metalliferous minerals and hydrocarbons. The amplitude and texture content of these images provide a wealth of information to geophysicists who attempt to delineate the nature of the Earth’s upper crust. These images prove to be extremely useful in remote areas and locations where the minerals of interest are concealed by basin fill. Typically, geophysicists compile a suite of aeromagnetic anomaly images, derived from amplitude and texture measurement operations, in order to obtain a qualitative interpretation of the lithological (rock) structure. Texture measures have proven to be especially capable of capturing the magnetic anomaly signature of unique lithological units. We performed a quantitative study to explore the possibility of using texture measures as input to a machine vision system in order to achieve automated classification of lithological units. This work demonstrated a significant improvement in classification accuracy over random guessing based on a priori probabilities. Additionally, a quantitative comparison between the performances of five classes of texture measures in their ability to discriminate lithological units was achieved. |
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Shankar, Vivek, 2009, Texture-based automated lithological classification using aeromagenetic anomaly images: U.S. Geological Survey Open-File Report 2009-1206, 130 p.
Abstract
Introdution
Geophysical Prospecting, Magnetism and Aeromagnetic Anomaly Surveying
Texture Analysis
Statistical Pattern Classification
Data and Software
Experiments and Results
Conclusion and Future Work
Appendix A: Creating a Composite Aeromagnetic Image
Appendix B: Lithological Units in Patagonia
Appendix C: Feature Vector Elements
Appendix D: List of Features Chosen
References