Post-Thinning Windthrow ht/dbh Risk Ratio
Observedtree-slendernessH/DBHafterthinning,matchedunits convertedcm/cm,not windthrowprobability/safety. Actual independently established geometry,calibration,product/rubricedition,units and applicability;not provenance,identity,grade,safe procedure or operational/compliance approval.
Description
A tree’s height-to-diameter ratio describes slenderness using height and diameter on the same length scale.
A tree’s height-to-diameter ratio describes slenderness using height and diameter on the same length scale.1
This tool converts height in meters and DBH in centimeters into that ratio; it does not calculate the probability of windthrow after thinning.
When to use Post-Thinning Windthrow ht/dbh Risk Ratio
Use this tool to apply the stated post-thinning windthrow ht/dbh risk ratio operation with an explicit input and unit basis.
How to use Post-Thinning Windthrow ht/dbh Risk Ratio and how it works
- Establish the measurement basis and units described above.
- Enter actualObservedTreeHeightMeters, actualObservedDbhCentimeters and run the tool.
- Read result.value using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualObservedTreeHeightMeters | Observed Tree Height Meters. Units, ordering and applicable branch are specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
| actualObservedDbhCentimeters | Observed Dbh Centimeters. Units, ordering and applicable branch are specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
Require positive measured height and positive diameter at breast height. Convert height to centimeters and divide by DBH; stand exposure, rooting, species and thinning history are not model inputs.
slenderness = 100 × heightMeters / DBHcentimeters Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.value | Dimensionless height/DBH ratio after matching length units. | number |
{
"input": {
"actualObservedTreeHeightMeters": 20,
"actualObservedDbhCentimeters": 40
},
"output": {
"result": {
"value": 50
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A returned boolean, signed difference or tied result follows the stated convention; an input error instead means the required input contract was not satisfied. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Thinning Residual Basal Area Yards/Acre Converter. Residual basal area expresses the cross-sectional stem area retained per unit ground area after thinning.
For a related operation, use Planting Spacing to Trees/Hectare Converter. Planting density follows from the area occupied by each position in an ideal rectangular spacing grid.
References
Similar or alternative tools
- Thinning Residual Basal Area Yards/Acre Converter
Residual basal area expresses the cross-sectional stem area retained per unit ground area after thinning.
- Planting Spacing to Trees/Hectare Converter
Planting density follows from the area occupied by each position in an ideal rectangular spacing grid.