----------------------------Original message---------------------------- I am working on a project using GIS and emergency medical data. I am using Atlas GIS for Windows, Dbase IV, Thomas Brother's Maps (Orange County, California) Digital Cartographic Files, and digitizing paper maps. Each record in the database is linked to a .25 square mile grid cell with a unique numerical ID number and a zip code. These grid cells cover all of Solano County, California (where I am doing my study). We do not have any addresses in our database. So far I have determined the distribution of medical emergencies during certain days of the year (going back to 1991), and I have determined the distrubution of specific types of medical emergencies such as gunshot wounds, heart attacks and auto accidents, and I have analyzed ambulance response times to medical emergencies. Has anyone done any studies/work related to GIS and emergency medical data? If you have please e-mail so we can compare notes. Sincerely, Tim Hayes Chief Cartographer Medical GIS Consulting Services United States [log in to unmask]