Computer-composite mapping for geologists |
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Authors: | J Nicholas van Driel |
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Institution: | (1) U.S. Geological Survey, 22092 703-860-6421 Reston, Virginia |
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Abstract: | A computer program for overlaying maps has been tested and evaluated as a means for producing geologic derivative maps. Four
maps of the Sugar House Quadrangle, Utah, were combined, using the Multi-Scale Data Analysis and Mapping Program, in a single
composite map that shows the relative stability of the land surface during earthquakes. Computer-composite mapping can provide
geologists with a powerful analytical tool and a flexible graphic display technique. Digitized map units can be shown singly,
grouped with different units from the same map, or combined with units from other source maps to produce composite maps. The
mapping program permits the user to assign various values to the map units and to specify symbology for the final map. Because
of its flexible storage, easy manipulation, and capabilities of graphic output, the composite-mapping technique can readily
be applied to mapping projects in sedimentary and crystalline terranes, as well as to maps showing mineral resource potential. |
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