Description
Return curved/straight, their absolute and relative excess, and uncertainty/straight.
Reptile and amphibian morphometrics use landmarks, measurement paths, image scales, and supplied correction models. A numeric adjustment does not establish anatomy, growth, health, or animal welfare.
Return curved/straight, their absolute and relative excess, and uncertainty/straight.
When to use this tool
Use Turtle Carapace Straight Curved Ratio when you need one documented animal measurement component.
How to use the tool and how it works
- Enter straightLength, curvedLength, measurementUncertainty. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ratio, curvatureExcess, relativeExcess, uncertaintyFraction. Use the output convention below.
Require positive straightLength, curvedLength at least straightLength, and nonnegative measurementUncertainty. Return curved/straight, their absolute and relative excess, and uncertainty/straight.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| straightLength | Straight Length | Required. Finite number; strictly above 0. |
| curvedLength | Curved Length | Required. Finite number. |
| measurementUncertainty | Measurement Uncertainty | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ratio | Ratio on the numerator and denominator basis stated above. | Required. Finite number. |
| curvatureExcess | Curvature Excess | Required. Finite number. |
| relativeExcess | Relative Excess | Required. Finite number. |
| uncertaintyFraction | Uncertainty Fraction | Required. Finite number. |
{
"input": {
"straightLength": 20,
"curvedLength": 24,
"measurementUncertainty": 0.5
},
"output": {
"ratio": 1.2,
"curvatureExcess": 4,
"relativeExcess": 0.2,
"uncertaintyFraction": 0.025
}
}Limitations and assumptions
- Lengths share units; supplied uncertainty is not statistically propagated and the ratio does not select a species-specific conversion or assess welfare.
- 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
Check measurement conventions, species-specific evidence, uncertainty, and appropriate animal-care expertise before biological or welfare decisions.
References
Similar or alternative tools
- Carapace Measure Path Base Flag
Select the reported length using reportCurved and return the path difference.
- Turtle Shell Photo Area Factor
Convert nonnegative pixelArea using squared scaleLength/scalePixels, then divide projectedArea by cosine(obliquityRadians), with angle strictly within ±π/2.