A choropleth map ( top ) and a dasymetric map ( bottom ) of the population of the San Francisco Bay Area in 2000.
12.
If a list article were summarized with a Choropleth map that would be more analogous to the Summary Tables and would be a major OR violation.
13.
Another 19th century example of thematic maps, according to Friendly ( 2008 ), was the earliest known choropleth map in 1826 created by Charles Dupin.
14.
A bivariate choropleth map uses color to solve a problem of representation in four dimensions; two spatial dimensions longitude and latitude and two statistical variables.
15.
In general, bivariate maps are one of the alternatives to the simple univariate choropleth maps, although they are sometimes extremely difficult to understand the distribution of a single variable.
16.
This can be transformed into a type of choropleth map to display on one's userpage where countries ( or even regions ? ) with more credits show up as a darker shade.
17.
Some election maps, however, have broken this tradition by simply coloring each areal unit with a red-blue mixture linked to voting ratio data resulting in an " unclassified choropleth map ".
18.
Considered a hybrid or compromise between isopleth and choropleth maps, a dasymetric map utilizes standardized data, but places areal symbols by taking into consideration actual changing densities within the boundaries of the map.
19.
Choropleth maps should only be used for nominal data ( like the party of an electoral result ), ratio data ( like temperatures or population densities ), or ordinal data ( like presidential approval ratings ).
20.
Choropleth maps are based on statistical data aggregated over previously defined regions ( e . g ., counties ), in contrast to area-class and isarithmic maps, in which region boundaries are defined by data patterns.
