Description
Return share = segmentEffort/totalEffort.
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 share = segmentEffort/totalEffort.
When to use this tool
Use Transect Segment Effort 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 segmentEffort, totalEffort. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read share. Use the output convention below.
Require positive totalEffort and segmentEffort between zero and totalEffort. Return share = segmentEffort/totalEffort. Effort can use time, distance or another consistently applied additive sampling-effort unit.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| segmentEffort | Segment Effort | Required. Finite number; minimum 0. |
| totalEffort | Total Effort | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| share | Dimensionless selected contribution divided by the stated total; not a percentage. | Required. Finite number. |
{
"input": {
"segmentEffort": 3,
"totalEffort": 12
},
"output": {
"share": 0.25
}
}Limitations and assumptions
- A share of effort is not a share of habitat, abundance or detection probability. Unequal sampling intensity and duplicate or overlapping effort require separate review.
- 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
- Sample Support Volume Fraction
Sum each array and return fraction = supportedVolume/totalVolume when totalVolume > 0, otherwise fraction = 0 and defined = false.
- Monitoring Effort Covered Fraction Tool
Calculate monitoring effort covered fraction from explicit caller-supplied inputs.