Thematic map

A thematic map depicts the spatial distribution or pattern of a specific subject, such as population, climate, or land use, across a geographic area.

Choropleth map: A thematic map that colors geographic areas according to values measured for each area. It is a widely used form for mapping rates or other area-based statistics.
Visual variables: Graphic properties such as size, shape, hue, and lightness used to encode information visually. Choosing an appropriate visual variable helps distinguish kinds of mapped data.
Population density: The number of people living within a specified unit of land area. It is a common subject for comparing how densely people occupy different places.
Topographic map: A map that represents terrain and often other natural and human-made features. It prioritizes general geographic reference and relief rather than one selected subject.
Isarithmic map: A map that uses lines or color bands to represent continuous values across space. It represents continuous subjects such as elevation or temperature without relying on administrative boundaries.
Color scale: An ordered or categorical sequence of colors used to represent data values. The scale shapes how readers perceive differences, order, and extremes.
Climate map: A map showing the geographic distribution of climate characteristics or climate zones. It maps temperature, precipitation, or climate classifications across regions.
Political map: A map emphasizing political boundaries and jurisdictions, such as countries or states. Its organizing subject is territorial division, unlike maps focused on varied data themes.
Proportional symbol map: A map that uses symbols sized in proportion to values at specific locations. It shows quantities at points while retaining their geographic positions.
Spatial aggregation: The grouping of observations into larger geographic units for analysis or display. Aggregation can smooth local variation and make area-level patterns appear stronger or weaker.

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