Population Estimate From Roofed Area

Screen occupied residential roofed-area population scenarios with building-specific use/occupancy and caller area-per-person bounds; not census counts or inferred contemporaneity.

Description

Roofed-area population scenarios depend on which buildings were residential and occupied at the same time.

Roofed-area population scenarios depend on which buildings were residential and occupied at the same time. A range of area-per-person assumptions gives a range of modeled populations rather than a census.^[1]

Screen occupied residential roofed-area population scenarios with building-specific use/occupancy and caller area-per-person bounds; not census counts or inferred contemporaneity.

When to use Population Estimate From Roofed Area

Use this tool to screen occupied residential roofed-area population scenarios with building-specific use/occupancy and caller area-per-person bounds; not census counts or inferred contemporaneity.

Prepare the artifact, site or survey measurements and any independently established calibration or model choices. Keep paired observations aligned and confirm units and coordinate conventions.

How to use Population Estimate From Roofed Area and understand its results

Prepare the artifact, site or survey measurements and any independently established calibration or model choices. Keep paired observations aligned and confirm units and coordinate conventions.
Enter buildingRoofedAreasM2, residentialFractions, occupiedFractions, callerResidentialM2PerPersonBounds using the field table and calculation rules, then run the tool.
Read effectiveOccupiedResidentialAreaM2, populationScenarioBounds. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
buildingRoofedAreasM2	Building roofed areas m2	list of number	Required
residentialFractions	Residential fractions	list of number	Required
occupiedFractions	Occupied fractions	list of number	Required
callerResidentialM2PerPersonBounds	Caller residential m2 per person bounds	list of number	Required

Pair nonnegative roofed areas in m² with residential and occupied fractions in [0,1]. Supply two ordered positive residential m²/person assumptions. Compute effective occupied residential area and divide by the reversed area-per-person bounds to return increasing population bounds.

Paired lists must be nonempty and have equal lengths.

effectiveArea = ΣroofArea_i residentialFraction_i occupiedFraction_i; population bounds = [area/highPerPerson,area/lowPerPerson]

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
effectiveOccupiedResidentialAreaM2	Effective occupied residential area m2	number
populationScenarioBounds	Population scenario bounds	list of number

json

{
  "input": {
    "buildingRoofedAreasM2": [
      100,
      200
    ],
    "residentialFractions": [
      0.5,
      0.8
    ],
    "occupiedFractions": [
      1,
      0.5
    ],
    "callerResidentialM2PerPersonBounds": [
      10,
      20
    ]
  },
  "output": {
    "effectiveOccupiedResidentialAreaM2": 130,
    "populationScenarioBounds": [
      6.5,
      13
    ]
  }
}

Limitations and assumptions

Contemporaneity, residential use and occupancy are supplied assumptions. Scenario bounds are not confidence intervals, and roofed area does not independently establish an observed population.

Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Settlement Rank Size Index: Fit log size versus log rank for supplied comparable settlement sizes and report primacy ratio; not a settlement hierarchy diagnosis or a mapped population estimator. For a complementary task, use Storage Capacity From Vessel Volume: Aggregate interior vessel capacity with explicit usable fill and independently supplied bulk material density; does not infer original contents or nutritional adequacy.

References

Population Estimate From Roofed Area — tool.io

Similar or alternative tools

Settlement Rank Size Index
Fit log size versus log rank for supplied comparable settlement sizes and report primacy ratio; not a settlement hierarchy diagnosis or a mapped population estimator.
Storage Capacity From Vessel Volume
Aggregate interior vessel capacity with explicit usable fill and independently supplied bulk material density; does not infer original contents or nutritional adequacy.