Description
Return usableEdge=edge-excluded and usableEdge/total.
Ecological observation summaries depend on sampling effort, eligible time, classified counts and missingness policies. Flower-minutes, area-days and observed proportions have different denominators. Observation support is distinct from true abundance, detection probability or a causal biological-control effect.
Return usableEdge=edge-excluded and usableEdge/total.
When to use this tool
Use Field Edge Habitat Share when checking the stated observation support, exposure, sample or seasonal-gap convention.
How to use the tool and how it works
- Enter totalArea, edgeArea, excludedEdgeArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read usableEdge, share. Use the output convention below.
Require positive total area, edge area within total and excluded edge area within edge area. Return usableEdge=edge-excluded and usableEdge/total.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| totalArea | Total Area | Required. Finite number; strictly above 0. |
| edgeArea | Edge Area | Required. Finite number; minimum 0. |
| excludedEdgeArea | Excluded Edge Area | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| usableEdge | Usable Edge | Required. Finite number. |
| share | Dimensionless share using the operation-specific denominator stated above; not a percentage number. | Required. Finite number. |
{
"input": {
"totalArea": 100,
"edgeArea": 20,
"excludedEdgeArea": 5
},
"output": {
"usableEdge": 15,
"share": 0.15
}
}Limitations and assumptions
- Uses the full field denominator; no actual habitat map or suitable habitat proportion is determined.
- 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
Use verified representative field records and suitable sampling/detection analysis for ecological inference, uncertainty and management.
References
Similar or alternative tools
- Crop Functional Group Share
Sum weights whose label matches requestedGroup and divide by all weights; zero total returns share=0, defined=false.
- Groundcover Bare Soil Fraction Gap
Return bareFraction=1-cover and signed observed-minus-target coverGap.