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A proportional symbol map or proportional point symbol map is a type of thematic map that uses map symbols that vary in size to represent a quantitative variable. [ 1 ] : 131 For example, circles may be used to show the location of cities within the map, with the size of each circle sized proportionally to the population of the city.
Proportional Symbol Maps represent a confluence of simplicity and insight, making them an indispensable tool for anyone working with GIS software. They transform the way we visualize and interpret spatial data, making complex patterns understandable at a glance.
Graduated and proportional symbol maps can be used to represent both raw and standardized (normalized) data. Both graduated and proportional symbols allow users to display trends over multiple data dimensions in one visualization.
Multivariate Dot and Proportional Symbol Maps. Another commonly-used thematic map type for multivariate mapping is the proportional symbol map. Making these types of maps is often easier than making bivariate choropleth maps.
Proportional symbol maps scale the size of simple symbols (usually a circle or square) proportionally to the data value found at that location. They are a simple concept to grasp: The larger the symbol, the “more” of something exists at a location.
Proportional symbol maps are a type of thematic map that use symbols of varying sizes to represent data associated with specific geographic locations. The size of the symbol correlates with the magnitude of the data it represents, allowing for a visual understanding of spatial patterns and relationships. This mapping technique is particularly ...
Proportional symbol maps take the simple symbols and scale them to size in proportion to the measure at that specific location. If you’re trying to determine which locations have more or less of a measure, the bigger symbols and the smaller symbols can tell the story.