METADATA AND MAP DELIVERY OF GEOLOGIC MAPS FOR OHIO

The Ohio Division of Geological Survey has developed digital maps and associated databases for a wide variety of products including: the bedrock geology at 1:24,000 and 1:500,000 scales, the bedrock topography at 1:24,000 and 1:500,000 scales, the three-dimensional surficial geology at 1:24,000 and 1:100,000 scales, and the abandoned-underground mines at 1:24,000 scale.

One method of accessing data is by examining the map catalog of the National Geologic Map Database. The Ohio Division of Geological Survey has compiled a metadata database of all open-file geologic maps created at 1:24,000 scale. The metadata database is used for a number of different applications. Software applications have been developed for the extraction and plotting of 1:24,000-scale bedrock- and bedrock-topography maps for the entire state. During the extraction process, the title, revision dates, and authors’ names are extracted from the metadata database and placed onto the newly composed map. The metadata database can be used to populate and update the map catalog of the National Geologic Map Database. The Ohio Survey has contributed over 3700 citations to the map catalog at 1:24,000 scale. Thus, methods to automate updating these listings represent significant time savings. Once a customer has identified a map using the map catalog, a request can be made to the Geologic Records Center at the Ohio Survey for either a printed map or the digital data itself. Future methods of access may involve on-line display of the digital maps through a National Geologic Map Database map server.