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The earliest known choropleth map was created in 1826 by Baron Pierre Charles Dupin, depicting the availability of basic education in France by department. [4] More " cartes teintées " ("tinted maps") were soon produced in France to visualize other "moral statistics" on education, disease, crime, and living conditions.
The dataset should be stored at Wikimedia commons, in the Data namespace, as a tabular data (.tab) file. Currently, the file format should be JSON, representing a three column table, where the first column is the three-letter ISO country code, the second is the year and the third is the value.
Like the choropleth map from which the dasymetric map was derived, the variable being mapped is an aggregate statistical summary over a district; there is still no information given on the degree of internal variation of the variable, thus retaining the danger of interpretation issues such as the ecological fallacy and the modifiable areal unit ...
A choropleth map is a thematic map in which areas are colored differently to show the measurement of a statistical variable being displayed on the map. The choropleth map provides an easy way to visualize how a measurement varies across a geographic area or it shows the level of variability within a region. In addition to choropleth maps, a ...
Such statistical maps, now called choropleth maps had just been invented in 1826 by Baron Charles Dupin. Guerry is best known for his Essay on moral statistics of France, presented to the French Academy of Sciences on July 2, 1832, and published in 1833 after it was awarded the Prix Montyon in statistics.
En-us-choropleth_map.oga (Ogg Vorbis sound file, length 1.2 s, 257 kbps, file size: 39 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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Some choropleth maps may be thought of as rough approximations of isarithmic maps, and dasymetric maps as slightly better approximations. A Continuous tone map represents a continuous field as smoothly transitioning color (hue, value, and/or saturation), usually based on a raster grid. Some have considered this to be a special type of ...