population density
Let an agent explain population density and its variants for human and nonhuman populations, compute it from population and area or volume, relay figures from statistical or ecological sources with dates and boundaries, and note the limits of comparing densities across units.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Define What density is.
Definition
Definition and variants.
Definition
Definition.
- How is population density defined, and what variants exist? definition
- Is the question about population density or population size or distribution? boundary
Compute
Computation.
Compute
Compute.
- How is density computed, and which area is used? action
- What is the result for the values in question? measurement
Data Figures and sources.
Figures
Figures.
Figures
Figures.
- What is the density of a given area, from which source, date and boundary? measurement
- Is the figure sourced and dated? boundary
Maps
Mapping density.
Maps
Maps.
- How is density mapped, and what do gridded datasets add? provenance
- Which entry fits population mapping? action
Interpret Interpretation and limits.
Limits
Boundary effects.
Limits
Limits.
- Why do densities depend on boundaries, and how are comparisons made fair? provenance
- Which references are standard? provenance
Uses
Uses.
Uses
Uses.
- How is density used in planning, epidemiology and ecology? provenance
- Which entry fits urban planning? action
Learn Teaching and history.
Teach
Teaching.
Teach
Teaching.
- How is population density taught, and which misconceptions arise? provenance
- Which entry fits demography? action
History
Historical densities.
History
History.
- How have densities changed historically, with sources? provenance
- Which entry fits urbanisation? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Cross-cutting context
- Entry kind
- thing
- Plane
- XCT
- Domain
- XCT.QLT
- Other names and narrower kinds
- population areal density, urban density, population density of administrative units in Russia, density dependence, physiological density
What it is Filled
The number of individuals in a human or nonhuman population per unit area or unit volume, expressed with the population, spatial boundaries and units specified; human population density is usually expressed as inhabitants per square kilometre or square mile for countries, regions, cities and statistical units, with variants including physiological density per unit of arable land and urban density measures, and the figure depends strongly on the boundaries and spatial measure used.
Why it exists Filled
Let an agent explain population density and its variants for human and nonhuman populations, compute it from population and area or volume, relay figures from statistical or ecological sources with dates and boundaries, and note the limits of comparing densities across units.
Distinguishing features Filled
- Density is the ratio of population to area or volume.
- Density depends on the boundaries used.
- Human population measures include variants for arable land and urban areas.
- Density is used in planning and ecology.
What robots and AI may and may not do Filled
Must not
- Compare densities computed over mismatched boundaries without warning.
- Use total area including water when land area is meant.
- Present stale population figures as current.
- Use density figures to stigmatise crowded neighbourhoods or the people who live there.
Only with a human decision
- Using density figures for planning or resource allocation decisions that affect residents requires human review.
May
- Compute population density from a stated human or nonhuman population and area or volume, giving units and dates.
- Explain variants such as physiological and urban density.
- Compare densities only across matching boundaries and dates.
Moral aspects Filled
- Density figures guide where services and money go.
- Crowding statistics have been used to stigmatise poor and migrant communities.
Who is affected
- Residents
- Planners
- Readers of statistics
Owners Filled
Steward
Nobody owns the measure; national statistics offices publish the authoritative figures.
Master systems
- National census and statistics databases
Links to other meta-models Filled
parent
- Q108914962 - registry parent class
- Q356710 - registry parent class
related
- number density - people per area
- population - the numerator
- urban planning - a main application
- population distribution - the wider pattern
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.population-density
- Wikidata: Q22856 (https://www.wikidata.org/wiki/Q22856)
Direct properties not applicable Not applicable
- world average: about 60 people per square km - land area; sources vary
- range: under 1 to tens of thousands people per square km - from sparse territories to dense cities
Plane XCT: no invented physical properties.
Recognition optional Filled
- Density is expressed as individuals per unit area or unit volume.
- Density depends on the boundaries used.
- Population size and growth are different measures.
- Not visible; a number in tables and choropleth maps.
Capabilities and actions required Filled
- explain the definition and variants
- compute density from population and area
- relay figures with sources and boundaries
- explain limits of comparison
Hazards and failure modes required Filled
- Comparing densities across mismatched boundaries can mislead.
- Using an area or volume measure that does not match the stated population and analytical purpose can mislead.
- Stale figures can mislead.
Standards and interfaces required Filled
- Census and statistical standards for population and area
- UN and national definitions of urban areas
Context of use required Filled
- Comparing how crowded areas are.
- arithmetic density
- physiological density per arable land
- urban and residential density
- density of administrative units
- density in ecology and density dependence, a related concept
Sources Filled
- Wikidata item Q22856: population density - identity and sense of the item
- Wikipedia: Population density - general description of the item
Open questions
- Should urban density be a separate entry?
- How should census data be linked?
- The registry entry has merged aliases for ecology and a country case; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q22856/spec.json