A thematic map in which areas are shaded or patterned in proportion to a statistical variable that represents an aggregate summary of a geographic characteristic within each area. For instance, population density per county, or average income per state, could be visualized using this method. Data is typically grouped into classes, and each class is assigned a different color or shading intensity.
These visualizations are a powerful tool in spatial analysis, enabling the identification of geographic patterns and disparities across regions. They simplify complex data, making it accessible for broader understanding and informed decision-making. Historically, this mapping technique evolved alongside advancements in statistical data collection and cartographic techniques, becoming a standard method for representing quantitative spatial information.
