Category:Choropleth maps using absolute numbers

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This category collects examples of choropleth maps that should be re-produced by properly applying cartographic methods. These misleading maps should afterwards be deleted.

Examples:

Bad map: Color corresponds to number of inhabitants total (absolute)
Good map: Color corresponds to ratio of inhabitants/area (relation)

Population vs Population density: A good population density map shows the topic with a color gradient (i.e. true choropleth map) or a tiered color gradient by classes. That means, the choropleths are directly showing the ratio of population to the area. (A good population map shows absolute numbers in "blob diagrams" or some similar method.) A BAD choropleth map displays the total population (absolute number) with the color gradient, showing the densely populated urban areas (often tiny districts!) with low saturation but the wide open rural districts with a deep saturation, thus exaggerating the impact of the rural population.

Maps showing GDP: A good choropleth map shows the ratio of the GDP and the population with a color gradient. That means, the choropleths are no longer connected to the area in a meaningful way, but the ratio is still meaningful because it refers to "GDP divided by population". (A good total-GDP map shows the absolute number of the GDP in a diagram.) A BAD choropleth map displays the total GDP with the color gradient, without regards to the number of the people in the district/area that are earning that GDP.

Applied to production: If Guyana and Brazil both produce 1 Million bananas, the per-area and the per-population production of Guyana is much higher than the production of Brazil. A choropleth map that displays all of Guyana and all of Brazil in the same color, exaggerates Brazil in a huge way (Brazil is 40 times larger and has 270 times more inhabitants)

Other: Prime example including description in the file: Education

Subcategories

This category has only the following subcategory.

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Media in category "Choropleth maps using absolute numbers"

The following 118 files are in this category, out of 118 total.

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