The Federal Highway Administration (FHWA) is emphasizing using low-cost visualization tools to help the public gain an understanding of transportation-related issues. Lindsay Banks and Mark Sarmiento of the FHWA hosted a Web conference last week (April 24) titled "Low-cost Internet-based Geospatial Technologies for Transportation." About 150 people attended. The session introduced transportation professionals to tools that are readily available to them, ways in which these tools can be used, and reasons why they are useful. Sarmiento made this point: "The general public is becoming more aware of these tools and we think they're going to expect us to be able to use them as visualization tools."

Banks and Sarmiento highlighted the use of Google Earth (primarily), as well as ESRI's ArcGIS Explorer, NASA World Wind, Skyline Software's Terra Explorer and Microsoft Virtual Earth, as products that can be used to communicate transportation-related information to the general public via the Web. They stressed that these tools do not replace GIS tools used for transportation-related analysis tasks, but serve as complements to them.

The next speaker was Craig Casper with the Pikes Peak Area Council of Governments (PPACG), which serves 15 local and county government agencies in the greater Colorado Springs, Colorado area. He discussed how his agency combined GIS and other data into a format viewable by the public. "What we're trying to do is use Google Earth to communicate with the public - it doesn't replace GIS analysis," he said.

Systems integrator CH2M HILL helped the PPACG convert that organization's transportation-related data to KML (Keyhole Markup Language) files, the format used by Google Earth. "They helped us make it [the data] look pretty and more usable," he said. The Citizen Advisory Committee provided overwhelmingly positive reaction, he reported.

Gary Macklis of the Ohio State Highway Patrol (OSHP) discussed the agency's use of Google Earth to distribute data about fatal accidents to the public. The agency is a relatively new user of GIS, starting in early 2004, and Macklis started manually mapping traffic fatalities later that year. He created PDF-format maps and posted them to the OSHP's website. Macklis explained that the next step, posting the fatality data in Google Earth, went live in May 2006 as part of a Memorial Day media push. During May the map mashup of fatalities was the 15th most visited page on the site.

A sample of OSHP’s Google Earth interface. (Click for larger image)