Digital Mapping Techniques '99 -- Workshop Proceedings
U.S. Geological Survey Open-File Report 99-386

Examples of Map Production from the Alaska Division of Geological and Geophysical Surveys

By Andrew M. McCarthy and Frank Ganley

Alaska Division of Geological and Geophysical Surveys
794 University Ave., Suite 200
Fairbanks, AK 99709
Telephone: (907) 451-5005
Fax: (907) 451-5050

As new technologies emerge, methods of producing geologic maps and other informational products are being refined and updated. At the Alaska Division of Geological and Geophysical Surveys, maps are produced on-demand from either an electrostatic or an HP design jet plotter. Growth of the geologic database and increased availability of outside data sources have led to increased efficiency in the production of geologic maps, derivative maps, and other products. The use of Arc/Info in conjunction with PC-based drawing and layout software has proven to be an effective method of producing a high quality product.

Two examples of projects are displayed. Information Circular 38, Volcanoes of Alaska was produced by DGGS in conjunction with the Alaska Volcano Observatory. The base map consists of hypsography from State of Alaska, Land Records Information Section (LRIS) Arc/Info grids, coastline from LRIS ArcInfo coverages, and bathymetry from USGS open file maps, combined using Arc/Info. The text was written by USGS and DGGS personnel and laid out using Adobe Pagemaker. The geologic map of the Horn Mountains area in southwestern Alaska is the result of field work carried out during the 1990, 1991, and 1992 field seasons. The geologic data was digitized in Arc/Info and converted to an EPS file. The surrounding text files are each individual Adobe Illustrator EPS files. All of these files were then linked in a single Illustrator file, in layers, with one EPS file per layer. The file was then sent to an HP plotter with the PostScript (optimized for portability - ADSC) option chosen.

Over the past year, we have found new ways of combining Arc/Info map data with PC drawing and layout programs. These methods allow us to publish maps with sophisticated layouts more quickly, while still retaining our underlying Arc/Info database.

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