Tree individuals alive at horizon (count)
Definition
The number of tree individuals observed alive at a declared observation horizon. One observation per tree per visit; a tree with no observation at the horizon is unobserved and counted separately, never as dead. Scheduled observations of the planted-with-monitoring stratum only (ADR-0020).
purpose
To state, tree by tree, how many of the trees planted are still alive at each horizon, as the numerator of the survival rate.
rationale
A count of observed living trees is the smallest honest outcome claim a planting programme can make; it requires a visit, an observer and a photograph per tree rather than a reported total.
Classification
- Result level: Outcome
- Outcome domains: Climate resilience, Green-space access and amenity
- Unit of observation: Tree individual
- Activity types: Monitoring visit
- Approval status: Approved
- Unit of measure:
NUM
Collections
- 2026 core indicator set: The fifteen indicators a 2026 project under the standard reports: the site preconditions and assessments, delivery and planting, education and care, and the survival family to T2. Every member is approved and served by an approved methodology whose records exist in the standard; the monthly and final reports are queries over approved claims at these indicators. Module indicators sit outside it.
- Survival family: The outcome indicators computed from one monitoring visit’s tree observations under NCGS-M001: trees alive at horizon, survival rate, trees by condition class, establishment rate; and for trees delivered with monitoring, planting uptake at T0+ and survival against the trees acknowledged at handover (ADR-0031).
Methodologies that serve it
- NCGS-M001 — Census count of tree state at a declared horizon
- NCGS-M002 — Stratified-sample estimate of tree state at a declared horizon
Where it can be claimed, by stratum and horizon: the claims table.