Knowra Proportional symbol map Proportional symbol map A thematic map that represents quantitative data with symbols sized in proportion to the values they represent. Symbol size communicates magnitude at locations or within areas.
Graduated symbol map : A thematic map that assigns features to a small number of symbol-size classes based on quantitative values. It groups values into size classes instead of scaling each symbol continuously.
Thematic map : A map designed to show the spatial distribution of a particular subject or attribute. Proportional symbol maps are one way to represent a mapped attribute.
Dot distribution map : A thematic map that uses repeated dots to show the distribution or quantity of a phenomenon. Dots emphasize distribution, while proportional symbols emphasize totals at mapped locations.
Choropleth map : A thematic map that shades geographic areas according to data values, usually normalized by area or population. Its area shading can imply uniform values within regions, unlike symbols marking specific locations.
Map scale : The relationship between distances on a map and corresponding distances on the ground. Changing map scale changes how large symbols appear and how much they overlap.
Quantitative data : Data expressed as numerical measurements or counts that support arithmetic comparisons. The values determine the relative sizes of the map symbols.
Cartogram : A thematic map that distorts geographic area to encode a quantitative variable. Cartograms change area itself, whereas proportional symbol maps retain geographic boundaries.
Isarithmic map : A thematic map that uses lines or bands to represent continuous phenomena across space. It represents spatially continuous surfaces rather than discrete totals at symbol locations.
Visual variable : A visual property, such as size, shape, or color, used to encode information in a graphic. Symbol size is the visual variable carrying quantitative magnitude.
Geographic information system : A computer system for storing, analyzing, and displaying data linked to geographic locations. GIS software commonly joins quantitative records to locations before symbolizing them.
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