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SpatialNews Press Release -
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GDT and U.S. Census Bureau Collaborate on Methods of Improving Positional Accuracy of Nationwide Street Databases Research to Explore Improved Quality and Interoperability of Street DatabasesThe agreement is the fifth Statement of Work (SOW) under GDT's Cooperative Research and Development Agreement (CRADA) with the U.S. Census Bureau. The CRADA, signed in November 1998, calls for GDT and the Bureau to research methods of maintaining the nation's spatial data infrastructure. Under the new statement of work, GDT and the Census Bureau will conduct field measurements of the positional accuracy of specified transportation centerline files. The goal of the SOW is to develop methodologies that will improve quality and ensure interoperability between nationwide street centerline databases. "These are complicated, difficult issues," said GDT Founder Donald Cooke, who is spearheading GDT's work on the joint project. "GDT has aggressive initiatives for improving the quality of our database, and the Census Bureau is also focusing on positional accuracy initiatives. We all benefit if we work together to come up with good solutions." This new cooperative effort builds on GDT's recent technologic initiatives--including conflation and segment realignment based on aerial photographs--to enhance the positional accuracy of its nationwide street database. To gauge the accuracy of these recent initiatives, GDT has developed a global positioning system (GPS) field data collection process to compare the actual latitude and longitude of key intersections with the coordinates reported in the database. These field observations, which have shown accuracy measures of less than six meters, have been evaluated using the National Standard for Spatial Database Accuracy (NSSDA). GDT was the first commercial vendor to publish accuracy results using this recently developed standard. "Positional accuracy is becoming increasingly important to users," said GDT President Michael Gerling. "Positional enhancement not only improves accuracy for users with demanding applications, but it also makes the map more attractive. And as mapping applications reach more into the consumer marketplace, map appearance becomes important because it provides familiarity for users." About GDT Geographic Data Technology, Inc., is a developer of premier map databases that provide the foundation for applications such as Web mapping, site selection, routing, environmental mapping, and direct marketing. GDT's state-of-the-art technology, leading-edge products, and strong customer commitment make it one of the foremost providers of geographic information in the United States. Founded in 1980, GDT was a pioneer in the development of cartographic data for business use and continues to provide complete, current, and comprehensive geographic data and services for business and consumer use. With its street, postal, census, and other geographic databases, GDT is the principal supplier of cartographic data to major GIS software and desktop mapping vendors and major Internet mapping sites. GDT is a wholly owned subsidiary of R.L. Polk. For more information, visit the GDT Web site at www.geographic.com. www.geographic.com
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