Description
Return observedShare = markedArea/surveyedArea.
Environmental monitoring coverage depends on what counts in the denominator. Time, effort, area, sampled volume and exposure weights describe different support measures; excluding missing or ineligible portions changes the question answered by a fraction.
Return observedShare = markedArea/surveyedArea.
When to use this tool
Use Mold Survey Observed Area Share when checking a monitoring or sampling share with an explicit inclusion and overlap convention.
How to use the tool and how it works
- Enter surveyedArea, markedArea, unobservedArea, uncertainArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read observedShare, minimumWholeShare, maximumWholeShare. Use the output convention below.
Require positive surveyedArea, nonnegative markedArea and uncertainArea with their sum <= surveyedArea, and nonnegative unobservedArea. Return observedShare = markedArea/surveyedArea. Over the whole area, return minimumWholeShare = markedArea/(surveyedArea+unobservedArea) and maximumWholeShare = (markedArea+uncertainArea+unobservedArea)/(surveyedArea+unobservedArea).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| surveyedArea | Surveyed Area | Required. Finite number; strictly above 0. |
| markedArea | Marked Area | Required. Finite number; minimum 0. |
| unobservedArea | Unobserved Area | Required. Finite number; minimum 0. |
| uncertainArea | Uncertain Area | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| observedShare | Observed Share | Required. Finite number. |
| minimumWholeShare | Minimum Whole Share | Required. Finite number. |
| maximumWholeShare | Maximum Whole Share | Required. Finite number. |
{
"input": {
"surveyedArea": 100,
"markedArea": 20,
"unobservedArea": 50,
"uncertainArea": 10
},
"output": {
"observedShare": 0.2,
"minimumWholeShare": 0.13333333333333333,
"maximumWholeShare": 0.5333333333333333
}
}Limitations and assumptions
- The bounds assign none or all uncertain and unobserved area to the marked condition; they are not statistical confidence limits. Survey marks do not diagnose mold species, exposure, building habitability or health effects.
- 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 intervals and sampling design, and compute overlaps from actual records when an aggregate deduction cannot be justified.
References
Similar or alternative tools
- Exposure Location Precision Width
Return width = upperCoordinate-lowerCoordinate and midpoint = lowerCoordinate/2+upperCoordinate/2.
- Exposure Averaging Window Share Tool
Audit supplied exposure observation coverage without filling missing measurements or calculating health risk.