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Attribute-coincidence mapping (ACM) is a powerful tool commonly used by geologists when they visually compare map data from diverse sources by use of a series of transparent overlays. The same geologists using computer-assisted ACM (particularly the MAPSS=MAGIC software system) can consider, evaluate, and replot or store for later retrieval many more kinds of data with less time and effort than with manual methods. Because the MAPSS=MAGIC system organizes and manages information by orthogonal patterns, standard CRT terminals or high-speed line printers enable users to view complex grid-cell patterns of derivative maps almost instantaneously, and thus facilitate rapid decision making.
ACM with the MAPSS=MAGIC system can be used at any scale to compute, analyze, and plot derivative patterns. For regional analysis the standard U.S. Geol. Survey 7 ½-minute quadrangle is used as the information cell for data manipulation. A demonstration of the system shows map patterns of some of the various attributes of sediment-associated massive-sulfide ore deposits that have been combined through ACM to identify potential exploration targets in Appalachian Devonian rocks. The massive-sulfide model was developed by the West German Federal Geol. Survey and recently modified by Wedow for computer use by the U. S. Geol. Survey. This ACM study of the Appalachian Devonian has revealed several significant exploration targets.
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