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A type of single-factor or topical map that is often diagrammatic to show traffic flow, movement of people or goods, or value by area, where areas of the political subdivisions are distorted so that their size is proportional to their monetary value.



a map that shows the average intensity of a phenomenon for individual regions (units) of the territorial division shown on the map.

For example, a cartogram may characterize the average population density or the extent of plowed land (average hectares of arable land per hundred hectares of total land area) according to country, region, or district. To make the map easier to read, each territorial unit is colored or hachured according to the computed intensity of the phenomenon in it, so that the density of the coloring or hachures reflects this intensity.

Cartograms are especially widely used for graphic reproduction of statistical data on population and agriculture. A shortcoming of cartograms is that they do not show differences in the intensity of the phenomena within each territorial unit; this problem is lessened by a further territorial division.

References in periodicals archive ?
We will see in the section on cartograms one situation in which a purposeful repositioning of features may be carried out.
The advantage of using area cartograms for visualizing statistical data has resulted in the proposal of various methods for their construction.
Nested value-by-area cartograms for symbolizing land use and other proportions.
More importantly, the partial differential equation governing the entire class of area cartograms, as a generalization of equal area maps, was published (Tobler 1986c).
Other examples of novel symbology that are worthy of study include Dorling's (1993) cartograms, Lavin and Cerveny's (1987) unit-vector density method, and fly-bys (a form of animation in which the user is given the feeling of flying over a three-dimensional landscape).
Cartograms methods (anamorphosis) are very seldom implemented.
Parallel Construction of Large Circular Cartograms Using Graphics Processing Units.
Using these methods, the cartograms are generated showing flows on a street network.
Some of the information in The World Today could have been effectively presented using cartograms.
Other thematic mapping methods include proportional symbols, isarithmic, cartograms, and dot density.
Cartograms are easier to read, expanded maps provide additional coverage of key census variable and additions of graphs to maps showing important statistical information, trends over time and relationships between variables.
For the equipped engine's with the model supposed by the author, have been raised up on the engine stall, the main cartograms for the injection's times, at totally and partially task (Grunwald, 1980) and the enrichment's coefficient at the totally task which are presented in the figure no.