A 3D choropleth map extends a choropleth map by using both color and height to represent values for geographic areas. Each region may be extruded into a prism whose height corresponds to a statistic such as population density or income.

Historical Background

Choropleth maps date back to early nineteenth-century statistical cartography. Three-dimensional extrusion became common with modern GIS, WebGL, and tools such as ArcGIS, Mapbox, deck.gl, and Kepler.gl.

Design Notes

• Use with caution because perspective can mislead.
• Avoid hiding small or low regions behind tall ones.
• Provide interaction and 2D alternatives.
• Clarify whether height, color, or both encode the value.

Summary

3D choropleth maps can be visually impactful, but they introduce occlusion and viewpoint dependency. They are best used when spatial extrusion supports exploration rather than replacing careful comparison.