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Track: Database Design and Automation
Terry Busch
SPOT Image Corporation
1897 Preston White Drive
Reston, VA 20191
Telephone: 1-800-275-7768
Fax: (703) 648-1813
E-mail: busch@spot.com
Paul Dilick
Using Satellite Imagery to Update Public Domain (DLG) Data Using ArcView for PC
Defining Issue: DLG conversion and updating in a PC environment. GIS Solution: SPOT Image Corporation, by request from the U.S. Fish and Wildlife Service, developed a PC resolution for wetland data updates. Methodology: This analysis explores the utility of orthocorrected satellite imagery for geographic data updates. Much of the publicly available data used are out-of-date or have not been resampled for over a decade. Using a PC and ArcView Version 2.1 (3.0) U.S. Fish and Wildlife National Wetlands Inventory data in USGS DLG format, vector data were converted to shapefiles using an Avenue script. SPOTView data were then placed into the same view with the vector data. The planimetric accuracy of the data set exceeds existing standards and acts as a very useful data source for updates. Using visual interpretation based on the satellite imagery, the vector data (shapefiles) were then updated to portray a more accurate depiction of the geographic boundaries. This application is valuable to anyone who
needs to update their DLG as well as create an accurate multilayer data set. Software: The application was written using ArcView, SPOTView satellite imagery, and Avenue
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