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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.
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.
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
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 ...
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.
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.
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