Classed Choropleth Map

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http://www.neighbourhood.statistics.gov.uk/dissemination/Info.do?page=userguide/detailedguidance/statisticalpresentation/statisticalmaps/best-practice-statistical-maps.htm

Classed choropleth maps provide visualizations of how a measurement can change across a given area. The proportions and measurements are shown by different levels of shading. This map shows the amount of spending by overseas residents in the year 2003.