The change depicted represents an increase or decrease in the rate of caner at each pixel. Red areas indicate areas with increasing rates and blue areas indicate decrease rates.
Data Sources: Cancer incidence data from the State Health Registry of Iowa. 1:100,000 Digital Raster Graphic from the Iowa Geographic Image Map Server hosted by Iowa State University. County borders from the Natural Resources GIS Library hosted by the Iowa Department of Natural Resources and the US Geological Survey.
Created by David Haynes, Kirsten Beyer, Gerard Rushton at the University of Iowa Department of Geography, software by Chetan Tiwari at the University of North Texas, June 2009.