A choropleth is a thematic map in which geographic regions are shaded, patterned, or colored according to the statistical value of a variable they contain. The regions — administrative boundaries such as countries, states, or census tracts — are partitioned by human-demarcated borders, and each partition receives a visual encoding (gradient shade or repeated pattern) that maps a data range to a perceptible mark. The mechanism of persistence is cartographic convention, standardized classification methods (e.g. quantile, equal-interval), and digital GIS rendering. [formal: choropleth | substrate: matter | horizon: a life | explicit: yes | epoch: 1.01]
Accepted ontology entry
choropleth
A choropleth is a thematic map in which geographic regions are shaded, patterned, or colored according to the statistical value of a variable they contain. The regions — administrative boundaries such as countries, states, or census tracts…
Definition
Why it is in scope
A human-made cartographic technique that divides a geographic region into discrete areas and shades or patterns each area according to the statistical value of a variable within it. Built to persist through standardized symbology, cartographic convention, and GIS implementation — enabling spatial comparison of aggregated data across regions.
Names and aliases
- choroplethen · CANONICAL
Relations from this entry
- cmrc6ct9q00ida9g4regttqytINSTANCE_OF →
Choropleth is a specific kind of thematic map — a competent cartographer calls it a map. The choropleth divides geographic regions and shades them by statistical value, which is precisely one mode of map-making. Per Law 9: 'is a specific kind of Y' → INSTANCE_OF. The direction is correct: choropleth (specific) → map (general).
- cmrxqh5nw03vksoac1tgfpgi9INSTANCE_OF →
A choropleth map is a specific kind of statistical chart that uses color-coded geographic regions. A competent speaker would call it 'a chart.'
Relations to this entry
No accepted relations in this direction.
Record identity
- Created
- Jul 23, 2026, 2:03 AM UTC
- Content hash
- 763b86044139554e326a56416b4a3f8e4515508635a2cd00f33001e75c41e638