Description
Compare supplied landmark distances without species-specific morphology thresholds.
Specimen measurements and animal observations depend on a defined body part, reference value, unit, and observation window. A mass fraction, size ratio, or timing share summarizes those inputs. The counting and measurement conventions must stay explicit when comparing specimens or records.
Compare supplied landmark distances without species-specific morphology thresholds.
When to use this tool
Use Body Landmark Distance Ratio when you need to compare supplied specimen measurements or observation records under an explicit reference and denominator.
How to use the tool and how it works
- Enter firstDistance, secondDistance. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ratio. Use the output convention below.
Return ratio=firstDistance/secondDistance, requiring nonnegative firstDistance and positive secondDistance.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstDistance | First Distance | Required. Finite number; minimum 0. |
| secondDistance | Second Distance | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ratio | Dimensionless ratio under compatible input units and the stated formula. | Required. Finite number. |
{
"input": {
"firstDistance": 3,
"secondDistance": 4
},
"output": {
"ratio": 0.75
}
}Limitations and assumptions
- Both distances must share a unit and compatible landmark definitions. The ratio is not a species identifier, a fitted allometric relation, or an assessment of normal morphology.
- The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Use compatible measurements and observation records to verify the chosen denominator and reference before interpreting a specimen comparison.
References
Similar or alternative tools
- Animal Track Stride Width Ratio
Return strideWidthRatio=strideLength/trackWidth and relativeStride=strideLength/footLength.
- Body Condition Size Reference Residual
Observed versus externally predicted mass residual on an explicit arithmetic or log scale.