Cartogram
From Wikipedia, the free encyclopedia
Net contributors -5000 to -1000 euro per capita -1000 to -500 euro per capita -500 to 0 euro per capita
Net recipients
0 to 500 euro per capita 500 to 1000 euro per capita 1000 to 5000 euro per capita 5000 to 10000 euro per capita 10000 euro plus per capita n/a
A cartogram is a map in which some thematic mapping variable – such as travel time or Gross National Product – is substituted for land area. The geometry or space of the map is distorted in order to convey the information of this alternate variable. There are two main types of cartograms: area and distance cartograms.
Contents |
[edit] Area cartograms
An area cartogram is sometimes referred to as a value-by-area map or an isodemographic map, the latter particularly for a population cartogram, which illustrates the relative sizes of the populations of the countries of the world by scaling the area of each country in proportion to its population; the shape and relative location of each country is retained to as large an extent as possible, but inevitably a large amount of distortion results. Other synonyms in use are anamorphic map and density-equalizing map.[1][2] The German word for cartogram is Kartenanamorphote, not Kartogramm.[3]
[edit] Distance cartogram
A distance cartogram may also be called a central-point cartogram. This form is typically used to show relative travel times and directions from vertices in a network.
One of the first cartographers to generate cartograms with the aid of computer visualization was Waldo Tobler of UC Santa Barbara in the 1960s. Prior to Tobler's work, cartograms were created by hand (as they occasionally still are). A number of software packages generate cartograms. Two examples of computer-generated cartograms are shown on the right.
[edit] References
[edit] Further reading
- Campbell, John. Map Use and Analysis. New York: McGraw-Hill, 2001.
- Gillard, Quentin. "Places in the News: The Use of Cartograms in Introductory Geography Courses." Journal of Geography. 78 (1979): 114-115.
- Tobler, Waldo. "Thirty-Five Years of Computer Cartograms." Annals of the Association of American Geographers. 94 (2004): 58-73.
- Vescovo, Victor. "The Atlas of World Statistics." Dallas: Caladan Press, 2005.
[edit] External links
 |
Wikimedia Commons has media related to: Cartograms |
- Cartogram Central
- Multiple cartograms showing the results of the 2008 U.S. presidential election
- Worldmapper collection of world cartograms
- Belgian cartograms
- Nonuniform coverage and cartograms
|
|||||
