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The Kentucky Geological Survey is using a semi-automated data capture technique to vectorize data from existing hard-copy geologic maps. A multi-step procedure is being developed to collect accurate vector data. The vector data will facilitate the use of geologic information in geographic information systems (GIS). The primary objectives of this program are to collect accurate vectorized geologic data at a scale of 1:24,000, create electronic 7.5-minute geologic quadrangle maps, and compile electronic l:100,000-scale maps from the l:24,000-scale maps. Conventional geologic mapping of Kentucky at a scale of 1:24,000 was completed in 1978. In 1996, as part of the STATEMAP component of the U.S. Geological Survey's National Cooperative Geologic Mapping program, the Kentucky Geological Survey initiated a project to convert published l:24,000-scale geologic quadrangle maps to digital format. Some published geologic quadrangle maps are out of print, and there are no plans to reprint them. The demand for digital information and the utility of digital data focused our attention toward converting these published maps to digital format. A total of 24 geologic quadrangle maps in the Hazard 30-minute by 1-degree l:100,000-scale quadrangle in the Kentucky River Basin was chosen to begin the digitizing process. Vectorizing existing geologic maps will create digital geologic data that can be used in computer applications and GIS. In a GIS, vectorized geologic contacts make it possible to manipulate data to obtain area and volume measurements, answer spatial queries, locate wells, and perform other geologic and mineral resource manipulations and searches. BACKGROUND The STATEMAP component of the USGS National Cooperative Geologic Mapping program mandates five types of data for inclusion in electronic form: geological, geochemical, geophysical, geochronological, and paleontological. As part of this program, the Kentucky Geological Survey (KGS) is currently collecting the following information in digital form: geologic contacts, major coal beds, structural contours, faults, paleontological sites, and point data (outcrops or other features). Under the STATEMAP program for 1996, KGS will complete the vectorization of 24 l:24,000-scale, 7.5 minute geologic quadrangle maps, and will compile them into a l:100,000-scale geologic map by edgematching each boundary. In the process, a database of appropriate metadata will be created. The Barcreek geologic quadrangle map was the first to be vectorized using the semi-automated data capture techniques (fig. 1). KENTUCKY GEOLOGY AS IT RELATES TO DIGITAL MAPPING The geology in Kentucky consists predominantly of flat-lying sedimentary rocks. The Cincinnati Arch, a large north-trending anticlinal structure in central Kentucky, divides the State into two basins: the Appalachian Basin in the east and the Illinois Basin in the west. Faulting is extensive in parts of Kentucky, but igneous intrusions are rare. Coal, limestone, sand, gravel, clay, oil, and natural gas are important mineral resources in Kentucky. Industries that extract these resources require resource assessments and 10 AASG/USGS WORKSHOP ON DIGITAL MAPPING TECHNIQUES, 1997

u.s. geological survey open file report/open-file report

Proceedings of a workshop on digital mapping techniques; methods for geologic map data capture, management, and publication - June 2 - 5, 1997, Lawrence, Kansas