Cull Percent From Rot Length Sawlog Sections
Compare actual rot-length cull convention with independent section-area volume proxy, not whole-section generic defect deductions; affected length is not all wood physically decayed. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
A cull allowance estimates an unusable proportion under a chosen geometric approximation.
A cull allowance estimates an unusable proportion under a chosen geometric approximation.1
Length weighting and cross-section weighting provide different proxies when logs have different areas. Use this tool to calculate cull percent from rot length sawlog sections from the supplied measurements and assumptions.
When to use Cull Percent From Rot Length Sawlog Sections
Use this tool to calculate cull percent from rot length sawlog sections from the supplied measurements and assumptions. Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
How to use Cull Percent From Rot Length Sawlog Sections and understand its results
- Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
- Enter observedSawlogSectionLengthsM, observedRotAffectedLengthsM, observedSectionAreasM2, using the field meanings and rules below, then run the tool.
- Read lengthBasedCullFraction, areaWeightedRotVolumeProxyFraction. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedSawlogSectionLengthsM | Observed sawlog section lengths m | list of number | Required |
| observedRotAffectedLengthsM | Observed rot affected lengths m | list of number | Required |
| observedSectionAreasM2 | Observed section areas m2 | list of number | Required |
Enter nonempty aligned positive log lengths and cross-sectional areas, and rotten lengths from zero through each log length. Return pooled rotten length/pooled length and pooled rotten-length×area/pooled length×area. Both are fractions; the second uses the supplied area proxy rather than a taper-aware volume integration.
lengthCull=ΣrottenLength/ΣlogLength; areaWeightedCull=ΣrottenLength×area/ΣlogLength×area Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| lengthBasedCullFraction | Length Based Cull Fraction; follow the units, sign, ordering and evidence convention stated above | number |
| areaWeightedRotVolumeProxyFraction | Area Weighted Rot Volume Proxy Fraction; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"observedSawlogSectionLengthsM": [
2,
3
],
"observedRotAffectedLengthsM": [
1,
1
],
"observedSectionAreasM2": [
1,
2
]
},
"output": {
"lengthBasedCullFraction": 0.4,
"areaWeightedRotVolumeProxyFraction": 0.375
}
}Limitations and assumptions
Length weighting and cross-section weighting provide different proxies when logs have different areas. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Heart Rot Column Height From Conk Position Estimator for this related task: A rot-column estimate needs independently established extents above and below a conk location.
Use Scribner/Doyle Log Scale Recovery Lookup when its separate inputs and assumptions fit the question: Scribner and Doyle references represent different board-foot estimation conventions.
References
Similar or alternative tools
- Heart Rot Column Height From Conk Position Estimator
A rot-column estimate needs independently established extents above and below a conk location.
- Scribner/Doyle Log Scale Recovery Lookup
Scribner and Doyle references represent different board-foot estimation conventions.