Bloodstain Impact Angle Arcsine Calculator
Ideal independently measured elliptical stain angle asin(width/length), same units. Restricted planar geometric model, not establish blood identity, origin, direction, crime circumstances or forensic certainty.
Description
An ideal elliptical bloodstain relates width-to-length ratio to an impact angle.
An ideal elliptical bloodstain relates width-to-length ratio to an impact angle.1
The geometric estimate assumes an independently qualified stain measurement and suitable formation model. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Bloodstain Impact Angle Arcsine 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 Bloodstain Impact Angle Arcsine Calculator and understand its results
- Establish the jurisdiction or research scope, observation and event definitions, reference date, matched period and denominator basis.
- Enter independentlyMeasuredEllipticStainWidth, independentlyMeasuredEllipticStainLength, using the field meanings and rules below, then run the tool.
- Read result.conditionalImpactAngleDegrees. 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 |
|---|---|---|---|
| independentlyMeasuredEllipticStainWidth | Independently measured elliptic stain width | number | Required |
| independentlyMeasuredEllipticStainLength | Independently measured elliptic stain length | number | Required |
Require nonnegative stain width and positive length on matching units, with width≤length. Compute asin(width/length) in degrees. Zero width gives zero degrees and equal dimensions 90; no stain selection, trajectory reconstruction or forensic validity assessment occurs.
conditionalAngleDegrees=(180/pi)×asin(stainWidth/stainLength) 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.conditionalImpactAngleDegrees | Conditional Impact Angle Degrees; use the units, sign convention and calculation stated above | number |
{
"input": {
"independentlyMeasuredEllipticStainWidth": 1,
"independentlyMeasuredEllipticStainLength": 2
},
"output": {
"result": {
"conditionalImpactAngleDegrees": 30.000000000000004
}
}
}Limitations and assumptions
The geometric estimate assumes an independently qualified stain measurement and suitable formation model. 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 Gunshot Residue Distance Range Lookup to examine a related aspect: Gunshot-residue distance interpretation needs laboratory calibration for the actual firearm, ammunition and target.
Use Ballistics NIBIN Hit Confidence Tier Lookup where its separate inputs and scope apply: NIBIN terminology distinguishes investigative leads from subsequent examination findings.
References
Similar or alternative tools
- Gunshot Residue Distance Range Lookup
Gunshot-residue distance interpretation needs laboratory calibration for the actual firearm, ammunition and target.
- Ballistics NIBIN Hit Confidence Tier Lookup
NIBIN terminology distinguishes investigative leads from subsequent examination findings.