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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 ?
Underload Mapping is performed by cartogram method; Low density of signs and letterings; Many "free" areas: signs and letterings are concentrated in one or a few small areas.
One is contiguous cartograms; a rectangular cartogram proposed by Rasiz (1934) serves as an example.
I suggest that world maps with countries colored by some statistical feature often would be more useful if done on a cartogram that is a compromise between population and size of countries, rather than on a map with a simple Mercator projection ("A Better Distorted View:' SN: 8/28/04, p.
a CARTOGRAM, and DATA for each of the 50 STATES--including high school graduation rates.
org and the cartogram programme used was supplied by Worldmapper.
2009) sought to improve the visualization of dots by generating a cartogram that could improve the presentation of dots by enlarging the map in very densely populated areas.
These states should also come close to doing so on a cartogram.
A cartogram distorts the shapes and sizes of places to convey statistical information.
Figure 1 shows an example of a cartogram using the described example.
But a cartogram represents places according to statistical information.
The proposed techniques outperform known cartogram generation methods regarding the homogeneity of the resulting data distribution, thus creating a more appropriate basis for analytic purposes.