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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 ?
Michael Gastner, Cosma Shalizi, and Mark Newman, "Maps and Cartograms of the 2004 US Presidential Election Results" (Ann Arbor, Michigan: University of Michigan, Accessed January 3, 2006), www-personal.
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.
In a cartogram, when density values are taken into account, the population factor within the region presents a different picture: the smaller islands become larger and the larger islands smaller (Map 6).
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.
The FAs were downloaded sequentially in accordance with the schedule and the developed cartogram, Vladimir Shtatskiy, the Head of the Centralized Repair Shop of Leningrad NPP under construction, described the details of the most important operation.
The main cartogram above shows the distribution of healthcare workers across the globe with each country resized according to the total number of doctors, nurses and midwives working there.
A cartogram distorts the shapes and sizes of places to convey statistical information.
These states should also come close to doing so on a cartogram.
This issue's cartogram is based on a compilation of a total of 917 hate groups that the SPLC has identified across the mainland 48 states of the USA in the year 2016.
Epidemiology Support and Analysis, Research Triangle Park, NC, USA, comments : "I LOVE the contiguous cartogram very elegant.
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.