Entomology Postmortem Interval Degree Days Calculator
Integrate actual piecewise-constant thermal history and locate independently validated development threshold. −1means unreached; not death-time/PMIcertainty, species/stage identification or neglect temperature/nonlinear/colonization uncertainty.
Description
Accumulated degree-days combine temperature above a validated development base with elapsed time.
Accumulated degree-days combine temperature above a validated development base with elapsed time.1
Insect development context is required before relating the thermal calculation to a postmortem interval. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Entomology Postmortem Interval Degree Days Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the jurisdiction or research scope, observation and event definitions, reference date, matched period and denominator basis.
How to use Entomology Postmortem Interval Degree Days Calculator and understand its results
- Establish the jurisdiction or research scope, observation and event definitions, reference date, matched period and denominator basis.
- Enter observedBinTemperaturesCelsius, observedBinDurationsDays, callerValidatedDevelopmentBaseCelsius, callerValidatedDevelopmentThresholdDegreeDays, using the field meanings and rules below, then run the tool.
- Read result.observedAccumulationDegreeDays, result.conditionalThresholdElapsedDays, result.thresholdReached. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedBinTemperaturesCelsius | Observed bin temperatures celsius | list of number | Required |
| observedBinDurationsDays | Observed bin durations days | list of number | Required |
| callerValidatedDevelopmentBaseCelsius | Caller validated development base celsius | number | Required |
| callerValidatedDevelopmentThresholdDegreeDays | Caller validated development threshold degree days | number | Required |
Supply nonempty aligned finite temperatures and strictly positive durations in days, with finite validated base temperature and positive degree-day threshold. In each bin use max(0,T−base)×duration. Accumulate all bins; record the first threshold crossing by linear time interpolation within its positive-rate bin. Return total degree-days, crossing time and reached flag; use −1 when not reached. This is a conditional development clock, not an independently determined time of death.
rate_i=max(0,temperatureC_i−baseC); accumulation=Σrate_i×days_i; crossing=elapsedBefore+(threshold−accumulationBefore)/rate_i, else−1 Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.observedAccumulationDegreeDays | Observed Accumulation Degree Days; use the units, sign convention and calculation stated above | number |
| result.conditionalThresholdElapsedDays | First modeled development-threshold crossing in days; −1 when not reached | number |
| result.thresholdReached | Whether the development threshold was reached in the submitted history | boolean |
{
"input": {
"observedBinTemperaturesCelsius": [
20,
30
],
"observedBinDurationsDays": [
1,
1
],
"callerValidatedDevelopmentBaseCelsius": 10,
"callerValidatedDevelopmentThresholdDegreeDays": 20
},
"output": {
"result": {
"observedAccumulationDegreeDays": 30,
"conditionalThresholdElapsedDays": 1.5,
"thresholdReached": true
}
}
}Limitations and assumptions
Insect development context is required before relating the thermal calculation to a postmortem interval. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Bloodstain Impact Angle Arcsine Calculator to examine a related aspect: An ideal elliptical bloodstain relates width-to-length ratio to an impact angle.
Use Gunshot Residue Distance Range Lookup where its separate inputs and scope apply: Gunshot-residue distance interpretation needs laboratory calibration for the actual firearm, ammunition and target.
References
Similar or alternative tools
- Bloodstain Impact Angle Arcsine Calculator
An ideal elliptical bloodstain relates width-to-length ratio to an impact angle.
- Gunshot Residue Distance Range Lookup
Gunshot-residue distance interpretation needs laboratory calibration for the actual firearm, ammunition and target.