Description
effectiveTemperature = max(0,min(temperature,upperCap)-lowerThreshold); degreeHours = effectiveTemperature*hours.
Development and size-growth summaries depend on temperature thresholds, elapsed exposure and the number of developmental steps. A degree-hour or geometric width ratio is a model term, not an independently established developmental stage.
effectiveTemperature = max(0,min(temperature,upperCap)-lowerThreshold); degreeHours = effectiveTemperature*hours.
When to use this tool
Use Insect Development Degreehour One Interval when checking a supplied thermal-exposure or per-instar growth term.
How to use the tool and how it works
- Enter temperature, lowerThreshold, upperCap, hours. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read effectiveTemperature, degreeHours. Use the output convention below.
Require upperCap > lowerThreshold and nonnegative hours. effectiveTemperature = max(0,min(temperature,upperCap)-lowerThreshold); degreeHours = effectiveTemperature*hours.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| temperature | Temperature | Required. Finite number. |
| lowerThreshold | Lower Threshold | Required. Finite number. |
| upperCap | Upper Cap | Required. Finite number. |
| hours | Hours | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| effectiveTemperature | Effective Temperature | Required. Finite number. |
| degreeHours | Degree Hours Unit: h. | Required. Finite number. |
{
"input": {
"temperature": 25,
"lowerThreshold": 10,
"upperCap": 30,
"hours": 4
},
"output": {
"effectiveTemperature": 15,
"degreeHours": 60
}
}Limitations and assumptions
- Temperature and thresholds share a temperature scale and degree-hours use hours. This is one constant-temperature capped term, not a species-specific development model or prediction of emergence.
- 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 a species-appropriate validated development model when predicting stages, emergence or seasonal timing.
References
Similar or alternative tools
- Larval Headcapsule Log Growth Ratio
widthRatio = secondWidth/firstWidth; logIncrementPerInstar = ln(widthRatio)/instarSteps; dyarRatio = widthRatio^(1/instarSteps).
- Insect Body Length Preservation Factor Tool
Explicit caller-supported preservation length factor and uncertainty interval; expansion factors over one remain possible.