Merchantable Top Break 4-Inch Spec
Locate a unique measured stem-profile crossing of caller top diameter in inches (four-inch example), converting exactly 2.54 cm/in; no extrapolated taper, invented plateau height or automatic merchantability.
Description
A merchantable top specification is a diameter criterion along an observed stem profile.
A merchantable top specification is a diameter criterion along an observed stem profile. A unique crossing allows interpolation without inventing taper beyond observations.1
Locate a unique measured stem-profile crossing of caller top diameter in inches (four-inch example), converting exactly 2.54 cm/in; no extrapolated taper, invented plateau height or automatic merchantability.
When to use Merchantable Top Break 4-Inch Spec
Use this tool to locate a unique measured stem-profile crossing of caller top diameter in inches (four-inch example), converting exactly 2.54 cm/in; no extrapolated taper, invented plateau height or automatic merchantability.
Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
How to use Merchantable Top Break 4-Inch Spec and understand its results
- Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
- Enter profileHeightsM, measuredDiametersCm, callerTopSpecificationInches using the field table and calculation rules, then run the tool.
- Read specificationDiameterCm, uniqueMerchantableTopHeightM. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| profileHeightsM | Profile heights m | list of number | Required |
| measuredDiametersCm | Measured diameters cm | list of number | Required |
| callerTopSpecificationInches | Caller top specification inches | number | Required |
Use positive caller inches, increasing nonnegative profile heights and aligned nonnegative diameters in cm. Convert inches exactly and locate the single threshold crossing. Missing, multiple or coincident plateau crossings are rejected.
specification cm=caller inches × 2.54; top height=unique linear diameter crossing Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| specificationDiameterCm | Specification diameter cm | number |
| uniqueMerchantableTopHeightM | Unique merchantable top height m | number |
{
"input": {
"profileHeightsM": [
0,
10,
20
],
"measuredDiametersCm": [
30,
20,
10
],
"callerTopSpecificationInches": 4
},
"output": {
"specificationDiameterCm": 10.16,
"uniqueMerchantableTopHeightM": 19.839999999999996
}
}Limitations and assumptions
Four inches is only an example specification. Other merchantability conditions and unobserved taper are not inferred.
Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Näslund Height Curve: Evaluate caller calibrated Näslund h=breast height+(d/(a+b d))² with explicit cm/metre calibration convention; no universal species curve or measured height lookup. For a complementary task, use Stump Volume Loss Percent: Inventory stump frustum envelopes and loss fraction on explicitly accounted stump+delivered log volume; unmeasured tops/defects are excluded, not asserted total biological harvest loss.
References
-
Merchantable Top Break 4-Inch Spec — tool.io
Similar or alternative tools
- Näslund Height Curve
Evaluate caller calibrated Näslund h=breast height+(d/(a+b d))² with explicit cm/metre calibration convention; no universal species curve or measured height lookup.
- Stump Volume Loss Percent
Inventory stump frustum envelopes and loss fraction on explicitly accounted stump+delivered log volume; unmeasured tops/defects are excluded, not asserted total biological harvest loss.