Map Visualizations are one of the most interactive ways to represent raw geographical data and transform it into visual representation that is easy to understand and interpret. There are different types of maps that are used to represent different types of attributes and features:
- Choropleth Map: These maps show divided geographical regions that are colored, shaded or patterned in relation to a data variable. But this makes it difficult to read or compare values from the map.
- Cartogram: Cartogram maps are used to show data that combines statistical information with geographic location like population and terrain, etc. But sometimes they tend to exaggerate variables by using polygon geometry.
- Dot distribution map: Dot maps used dots to display a feature or phenomenon. They use visual scatter to show spatial pattern.
- Proportional symbol map: These are most commonly used for thematic mapping. A symbol is selected and its size or area is altered in relation to the value of data variable.
- Contour/ Isopleth map: Isarithmic map is a two-dimensional representation of a three-dimensional volume and isopleth maps is a type of isarithmic map that shows data that occurs over geographical areas. Contour lines or filled contours are used to show how features differ in quantity over surface.
- Dasymetric Map: The purpose of this map is also thematic mapping but it utilizes standardized data and places areal symbols by taking into consideration actual changing densities within the boundaries of the map. They are generally created by geographical information systems and widely used for conservation and sustainable development.
Image source: http://guides.library.duke.edu/datavis/vis_types – category: 2D/Planar
Source: www.datavizcatalogue.com