Angle Gauge BAF Calculator
Calibrate actual aperture/eye-distance angle gauge BAF and independently assigned inclusion weights, not prism-deflection-angle input or fixed plot tree area. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
An angle gauge defines a sighting angle used to estimate basal area through a basal-area factor.
An angle gauge defines a sighting angle used to estimate basal area through a basal-area factor.1
The adopted exact half-angle geometry and tree-inclusion weights determine the conditional estimate. Use this tool to calculate angle gauge baf from the supplied measurements and assumptions.
When to use Angle Gauge BAF Calculator
Use this tool to calculate angle gauge baf 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 Angle Gauge BAF Calculator and understand its results
- Establish the species/site, survey protocol, units, sampled area or exposure, and the independently chosen reference or model.
- Enter gaugeOpeningMm, gaugeEyeDistanceMm, observedIncludedTreeWeights, using the field meanings and rules below, then run the tool.
- Read metricGaugeBaf, weightedBasalAreaM2Ha. 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 |
|---|---|---|---|
| gaugeOpeningMm | Gauge opening mm | number | Required |
| gaugeEyeDistanceMm | Gauge eye distance mm | number | Required |
| observedIncludedTreeWeights | Observed included tree weights | list of number | Required |
Require positive opening width and eye distance in matching units, plus inclusion weights in [0,1]. Scale opening and distance to avoid large intermediate values; use the exact half-angle sine (opening/2)/hypot(opening/2,eyeDistance). BAF is 10000 times that sine squared, and basal area is BAF times the sum of inclusion weights, in m²/ha. An empty inclusion list returns zero basal area. No tree-inclusion judgment or sampling design is inferred.
BAF=10000×[(opening/2)/hypot(opening/2,eyeDistance)]²; basalAreaM²PerHa=BAF×ΣinclusionWeights Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| metricGaugeBaf | Metric Gauge Baf; follow the units, sign, ordering and evidence convention stated above | number |
| weightedBasalAreaM2Ha | Weighted Basal Area M2 Ha; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"gaugeOpeningMm": 10,
"gaugeEyeDistanceMm": 500,
"observedIncludedTreeWeights": [
1,
0.5
]
},
"output": {
"metricGaugeBaf": 0.9999000099990004,
"weightedBasalAreaM2Ha": 1.4998500149985006
}
}Limitations and assumptions
The adopted exact half-angle geometry and tree-inclusion weights determine the conditional estimate. 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 Stand Table Lookup for this related task: Stand-density indices depend on the chosen diameter basis and reference relationship.
Use Reineke Slope Calculator when its separate inputs and assumptions fit the question: A Reineke-style density relationship can be fitted as a power law between diameter and stem density.
References
-
Angle Gauge BAF Calculator — tool.io
Similar or alternative tools
- Stand Table Lookup
Stand-density indices depend on the chosen diameter basis and reference relationship.
- Reineke Slope Calculator
A Reineke-style density relationship can be fitted as a power law between diameter and stem density.