8 - 1 Module 7: Geographical Charts This module includes information on rate maps and spot maps, the two most common types of geographical charts used in public health. Reviewed 15 April 05 /MODULE 7 8 - 2 Two Types of Geographical Charts Spot map: Each dot represents a specified number of cases Rate map: Geographical areas shaded, patterned, or colored according to magnitude of rate 8 - 3 Examples of Spot Maps Source: Am J Public Health, April 2004;94:669 8 - 4 Source: Am J Public Health, Dec. 2003;93:1998 8 - 5 Source: Am J Public Health, July 2001;90:1195 8 - 6 Examples of Rate Maps Source: Am J Public Health, Dec. 2003;93:2134 8 - 7 Source: Am J Public Health, July 2001;90:1195 8 - 8 Source: Am J Public Health, June 1999;89:896 8 - 9 Obesity Trends* Among U.S. Adults BRFSS, 1985 No Data