Thematic Map

source: http://images.google.com/imgres?imgurl=http://www.sou.edu/Geography/JONES/GEOG280/stpop96.GIF&imgrefurl=http://www.sou.edu/Geography/JONES/GEOG280/sample.htm&usg=__RJZnLV1ie_lJn8gBnehitC-rKiM=&h=354&w=468&sz=17&hl=en&start=5&um=1&tbnid=rhESZkvCQ021-M:&tbnh=97&tbnw=128&prev=/images%3Fq%3Dthematic%2Bmap%26hl%3Den%26um%3D1

The map above shows population percent change in the U.S from 1990-1996. This thematic map is catagorized by color. The color represents a certain percent change over a certain area for six years.