Description
Set denominator to observedHours-missingHours when excludeMissing is true, otherwise observedHours, then return fraction = inundatedHours/denominator.
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.
Set denominator to observedHours-missingHours when excludeMissing is true, otherwise observedHours, then return fraction = inundatedHours/denominator.
When to use this tool
Use Wetland Inundation Day Fraction Term when checking a monitoring or sampling share with an explicit inclusion and overlap convention.
How to use the tool and how it works
- Enter inundatedHours, observedHours, missingHours, excludeMissing. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read fraction, denominator. Use the output convention below.
Require missingHours >= 0, observedHours > missingHours and inundatedHours between zero and observedHours-missingHours. Set denominator to observedHours-missingHours when excludeMissing is true, otherwise observedHours, then return fraction = inundatedHours/denominator. All durations are in hours.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| inundatedHours | Inundated Hours | Required. Finite number; minimum 0. |
| observedHours | Whole recorded window in hours, including missingHours under this tool convention. | Required. Finite number. |
| missingHours | Missing Hours | Required. Finite number; minimum 0. |
| excludeMissing | Exclude Missing | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| fraction | Dimensionless ratio under the stated denominator convention; not multiplied by 100. | Required. Finite number. |
| denominator | Denominator | Required. Finite number. |
{
"input": {
"inundatedHours": 60,
"observedHours": 100,
"missingHours": 20,
"excludeMissing": true
},
"output": {
"fraction": 0.75,
"denominator": 80
}
}Limitations and assumptions
- Despite its field name, observedHours is the whole supplied window including the missing portion under this convention. Missing hours are excluded or retained in the denominator, not imputed as observed wet or dry conditions.
- 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
- Monitoring Window Coverage Share
Return uniqueCovered as that difference and coverage = uniqueCovered/windowDuration.
- Monitoring Effort Covered Fraction Tool
Calculate monitoring effort covered fraction from explicit caller-supplied inputs.