Track: Federal Government Systems
Virtual Seamlessness - The Solution to Reengineering Existing GIS Databases
John SunVincent Zhuang , Dave Wolf
The existing geographic information system databases were likely assembled according to a certain type of boundary, such as state or county, a configuration that presents a problem when migrated to enterprisewide GIS under a client/server environment or through the World Wide Web. This configuration problem presents a lack of seamlessness, which can be resolved using virtual seamlessness to reengineer existing GIS databases. Virtual indexing was created for the Environmental Protection Agency (EPA) national shapefile repository based on states, counties, the United States Geological Survey (USGS) hydrologic cataloging units, and ZIP Code boundaries. The resultant virtual grids provide virtual seamlessness across a single layer; homogeneous virtual grids offer vertical seamlessness among several layers. Virtual seamlessness is a solution to reengineering existing GIS databases at a minimum cost, especially for a small or medium enterprise.
John Sun
SAIC
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