http://images.google.com/imgres?imgurl=http://content.answers.com/main/content/wp/en/thumb/2/28/180px-Choropleth.gif&imgrefurl=http://www.answers.com/topic/thematic-map-1&h=112&w=179&sz=12&hl=en&start=6&tbnid=ErFThf-AjewyWM:&tbnh=63&tbnw=101&prev=/images%3Fq%3DUnivariate%2Bchoropleth%2Bmap%26gbv%3D2%26ndsp%3D20%26hl%3Den%26sa%3DNThe above map is a univariate choroopleth map of the water use per day in the United States. A univariate map uses a single data (in this case it is water usage).
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