Description
Return eligibleCellArea and eligibleCellArea/studyArea.
Population indicators depend on compatible boundaries, time periods, counted groups, and denominator choices. A share or density can change when exclusions or daytime populations change, even without arithmetic error.
Return eligibleCellArea and eligibleCellArea/studyArea.
When to use this tool
Use Population Grid Cell Area Share when you need one transparent population-accounting component.
How to use the tool and how it works
- Enter cellArea, studyArea, excludedCellArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read eligibleCellArea, areaShare. Use the output convention below.
Require cellArea within positive studyArea and excludedCellArea within cellArea. Return eligibleCellArea and eligibleCellArea/studyArea.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| cellArea | Cell Area | Required. Finite number; minimum 0. |
| studyArea | Study Area | Required. Finite number; strictly above 0. |
| excludedCellArea | Excluded Cell Area | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| eligibleCellArea | Eligible Cell Area | Required. Finite number. |
| areaShare | Area Share | Required. Finite number. |
{
"input": {
"cellArea": 20,
"studyArea": 100,
"excludedCellArea": 5
},
"output": {
"eligibleCellArea": 15,
"areaShare": 0.15
}
}Limitations and assumptions
- Areas share a projection and unit; exclusions change only the numerator and no population allocation or boundary geometry is computed.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review source definitions, geography, temporal alignment, and uncertainty before making a demographic or service-access conclusion.
References
Similar or alternative tools
- Settlement Area Share
Divide settlementArea within [0, totalArea] by positive totalArea.
- Census Area Boundary Population Factor
Subtract transferredOut within oldPopulation and add nonnegative transferredIn for rebasedPopulation.