Demonstration 04
Choropleth renderer
A choropleth shades each area by a data value. Pick an attribute and the map sorts the counties into five color classes — darker means more. This is the technique at the heart of thematic mapping, and the one my graduate work leaned on most.
Population
Data: 2020 U.S. Census, Hawaiʻi Statewide GIS Program (public domain). Classification: quantile breaks, 5 classes.
Notice how the story changes with the attribute. By raw population,
Honolulu County dominates; switch to density and the contrast between urban Oʻahu
and the rural neighbor islands sharpens. Same geography, different question.