http://geography.wr.usgs.gov/science...s/colonius.jpg
View of rural neighborhoods within 150 miles of the American-Mexican border.
http://geography.wr.usgs.gov/science/colonias.html
Monitoring Colonias Development Along the United States-Mexico Border
Western Region Geography is working to create Internet-enabled GIS that will help cities along the Arizona-Sonora portion of the United States–Mexico border deal with issues related to colonias. Colonias are rural neighborhoods within 150 miles of the border that lack adequate infrastructure or housing, as well as other basic services. Cooperators include the USGS Rocky Mountain Mapping Center, which piloted this project along the Texas border, as well as the U.S. Department of Housing and Urban Development, the Mexican Instituto Nacional De EstadÃÂ*stica GeografÃÂ*a E Informática, and the University of Arizona.