Residual Stand Damage Percent Basal Area

Compare caller observed damaged residual basal area with assessable residual inventory and bounds for unassessable area; no diagnosis from raw stem count or assumed health of unexamined trees.

Description

Residual damage can be observed only on assessable basal area.

Residual damage can be observed only on assessable basal area. Bounds for unassessable area preserve uncertainty rather than assuming unexamined trees healthy.^[1]

Compare caller observed damaged residual basal area with assessable residual inventory and bounds for unassessable area; no diagnosis from raw stem count or assumed health of unexamined trees.

When to use Residual Stand Damage Percent Basal Area

Use this tool to compare caller observed damaged residual basal area with assessable residual inventory and bounds for unassessable area; no diagnosis from raw stem count or assumed health of unexamined trees.

Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.

How to use Residual Stand Damage Percent Basal Area 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 assessableResidualBasalAreaM2, damagedResidualBasalAreaM2, unassessableResidualBasalAreaM2 using the field table and calculation rules, then run the tool.
Read observableResidualDamagePercent, wholeResidualBasalAreaDamagePercentBounds. 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
assessableResidualBasalAreaM2	Assessable residual basal area m2	number	Required
damagedResidualBasalAreaM2	Damaged residual basal area m2	number	Required
unassessableResidualBasalAreaM2	Unassessable residual basal area m2	number	Required

Enter positive assessable residual m², nonnegative damaged m² no greater than assessable, and nonnegative unassessable m². Return observable damage percentage and whole-inventory bounds.

observed damage %=100damaged/assessable; whole bounds=[100damaged/total,100(damaged+unassessable)/total]

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
observableResidualDamagePercent	Observable residual damage percent	number
wholeResidualBasalAreaDamagePercentBounds	Whole residual basal area damage percent bounds	list of number

json

{
  "input": {
    "assessableResidualBasalAreaM2": 30,
    "damagedResidualBasalAreaM2": 6,
    "unassessableResidualBasalAreaM2": 10
  },
  "output": {
    "observableResidualDamagePercent": 20,
    "wholeResidualBasalAreaDamagePercentBounds": [
      15,
      40
    ]
  }
}

Limitations and assumptions

The extremes assume all unassessable area undamaged or damaged. Damage diagnosis is supplied rather than inferred.

Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Shelterwood Overstory Retention Percent: Summarize matched original/retained overstory basal-area inventories and represented area; not single-tree basal area, canopy cover or a regeneration guarantee. For a complementary task, use Ice Storm Canopy Retained Severity Percent: Audit measured retained live crown volume after storm against matched prestorm inventory and caller loss cutoff; canopy volume differs from shade/cover and observations do not establish future tree survival.

References

Residual Stand Damage Percent Basal Area — tool.io

Similar or alternative tools

Shelterwood Overstory Retention Percent
Summarize matched original/retained overstory basal-area inventories and represented area; not single-tree basal area, canopy cover or a regeneration guarantee.
Ice Storm Canopy Retained Severity Percent
Audit measured retained live crown volume after storm against matched prestorm inventory and caller loss cutoff; canopy volume differs from shade/cover and observations do not establish future tree survival.