Description
Return perimeter=2*(length+width) and perimeter/area=2*(1/length+1/width).
Habitat geometry describes lengths, overlaps and areas on explicit ideal shapes. An edge-to-area ratio and a root-depth overlap summarize different spatial relations; neither identifies a species-specific edge effect or functional connectivity. Supplied nonoverlap flags do not replace a geometric check.
Return perimeter=2*(length+width) and perimeter/area=2*(1/length+1/width).
When to use this tool
Use Habitat Strip Edge Ratio when checking the stated ideal habitat, buffer or interval geometry.
How to use the tool and how it works
- Enter length, width. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read perimeter, edgePerArea. Use the output convention below.
Require positive rectangular length and width. Return perimeter=2*(length+width) and perimeter/area=2*(1/length+1/width).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| length | Length | Required. Finite number; strictly above 0. |
| width | Width | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| perimeter | Perimeter | Required. Finite number. |
| edgePerArea | Edge Per Area | Required. Finite number. |
{
"input": {
"length": 10,
"width": 2
},
"output": {
"perimeter": 24,
"edgePerArea": 1.2
}
}Limitations and assumptions
- Ideal edge length per area is not an empirical edge-effect or habitat-quality estimate.
- 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 mapped boundaries and appropriate complete spatial/ecological models for real habitat function or field layout.
References
Similar or alternative tools
- Habitat Edge Strip Area Ratio
Sum length*width, require the sum<=plotArea and return its area share.
- Habitat Buffer Edge Area Factor
Return nominal rectangle area=length*width and add the signed cornerCorrection for correctedArea.