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Cartogram of Germany, with the states and districts resized according to population. The area cartogram is by far the most common form; it scales a set of region features, usually administrative districts such as counties or countries, such that the area of each district is directly proportional to a given variable.
A cartogram is a map that intentionally distorts geographic space based on a given variable, usually by scaling features so their size is proportional to their value of the variable. [33] For example, the countries of the world could be scaled proportional to their population.
Cartogram – Map distorting size to show another value; Terrain cartography, also known as Cartographic relief depiction – Representation of surface shape on maps; City map – large-scale thematic map of a city; Counter-mapping – Mapping by communities to contest state maps
A Cartogram purposefully distorts the size of areal features proportional to a chosen variable, such as total population, and thus may be thought of as a hybrid between choropleth and proportional symbol maps. Several automated and manual techniques have been developed to construct cartograms, each having advantages and disadvantages.
The following outline is provided as an overview of and topical guide to cartography: . Cartography (also called mapmaking) – study and practice of making and using maps or globes.
A cartogram is a map that distorts region size proportionally, while a flow map represents lines, often using the width of the symbol (a form of size) to represent a quantitative variable. That said, there are gray areas between these three types of proportional map: a Dorling cartogram essentially replaces the polygons of area features with a ...
Since this projection scales north-south distances by the reciprocal of east-west stretching, it preserves area at the expense of shapes. In the first case (Mercator), the east-west scale always equals the north-south scale. In the second case (central cylindrical), the north-south scale exceeds the east-west scale everywhere away from the equator.
The scale statement can be accurate when the region mapped is small enough for the curvature of the Earth to be neglected, such as a city map. Mapping larger regions, where the curvature cannot be ignored, requires projections to map from the curved surface of the Earth to the plane.
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