OA Open Arbor v2.1
Open Arbor Alliance Standard · CC-BY-SA-4.0 / AGPL-3.0-only · STIM v7.0011

RCA-Spec v2.0 & 200-Year Sovereign Architecture Reference

Complete technical reference for the Regenerative Consulting Arborist (RCA-Spec v2.0) 10-section evidentiary standard, primary mathematical formulas, the 2026 to 2226 Heartwood/Cambium Vault architecture, and Draft 2020-12 JSON Schemas.

Download RCA_v2 Schema (.json) Download Ordinance Schema (.json)
Section 1

RCA-Spec v2.0 10-Section Evidentiary Report Standard & Hard Linter Rules

RCA-Spec v2.0 absorbs classical ISA (TRAQ, CODIT), ASCA (7-part evidentiary report structure), and Claus Mattheck (t/R hollow-shell buckling, AS 4970 SRZ) rigor into open ECMAScript code while inverting the valuation polarity from tree liquidation to living holobiont equity.

The Five Mandatory Diagnostic Domains & 10-Section Compiled Report

5 Mandatory Schema Domains (rca_assessment.schema.json)
  1. structural_baseline: Biometrics (dbh_cm, height, crown spread, plus_code_global), isa_traq_risk matrix, municipal_permit_disposition, Shigo CODIT wall response, and Mattheck sound_shell_thickness_ratio_t_over_r.
  2. rhizosphere_and_root_collar: Root flare diameter (DRF), burial depth, stem-girdling root (SGR) count and severity, airspade_radial_trenching_geometry, and CRZ/SRZ/TIZ radii.
  3. soil_and_microbiome_baseline: Dry bulk density (g/cm3), steady-state infiltration (mm/hr), organic matter (%), soil pH, and mycorrhizal_and_fungal_observations (F:B ratio, guild, iNaturalist fungal taxa).
  4. understory_and_guild_prescription: SER reference ecosystem, engine-scaled biochar (L), humate (kg), fungal compost (m3), ramial woodchip mulch (m3), synthetic NPK/fungicide exclusion check, and native companion species guild (open_nursery_batch_id).
  5. outcome_monitoring_schedule: Explicit stim_hypothesis_statement, stim_kill_criterion, 12-month leading indicators, and 60-month lagging indicators with 5-dimension Sanctuary Scorecard targets.
10-Section Compiled Evidentiary Report (compileRcaEvidentiaryMarkdown)
  1. Executive Disposition & Biometric Baseline (with canonical SHA-256 cryptographic digest)
  2. Classical Biomechanics: Mattheck Shell-Wall Physics & Shigo CODIT
  3. Municipal Ordinance & Statutory Compliance (exact code citations & mitigation liability)
  4. Subterranean Rhizosphere & Pneumatic Root-Collar Forensics (150 psi AirSpade trench volume)
  5. Soil Physics & Mycorrhizal Microbiome Baseline
  6. Nodal Biological Amendment & Native Companion Guild Prescription
  7. Dual Asset Valuation: CTLA 10th Ed. vs. 200-Year Holobiont Biological Equity
  8. 5-Year Practice Economics: Regenerative Stewardship vs. One-Time Liquidation
  9. STIM Longitudinal Monitoring Schedule & Sanctuary Scorecard Targets
  10. Vector Root-Zone Protection Site Map (SVG) & Evidentiary Verification Summary

Hard Evidentiary Linter Gates (lintRcaEvidentiaryReport)

Hard Evidentiary Linter Rules in lintRcaEvidentiaryReport
Linter Rule Code Trigger Condition Enforcement Action & Rationale
MISSING_DOMAIN Any of the 5 mandatory RCA domains is absent or non-object Blocks compilation and Open Badge minting until all 5 above-ground and subterranean domains are populated.
INVALID_BIOMETRICS / INVALID_GEO_LOCATION dbh_cm ≤ 0 or missing plus_code_global Requires positive metric DBH and a valid 10-to-15 character Open Location Code (Plus Code).
UNJUSTIFIED_REMOVAL Disposition is Removal_Last_Resort_Unmitigable_Hazard while t/R ≥ 0.30 Hard Preservation Gate: Under Mattheck (1994), a hollow shell with t/R ≥ 0.30 retains full hollow-cylinder bending strength. Removal is blocked when rhizosphere remediation and crown reduction can mitigate risk.
EVIDENTIARY_DEFECT Removal recommended without sonic_tomography_or_resistograph_uri Requires acoustic tomogram (PiCUS / Arbotom) or micro-drilling resistograph evidence before condemning a mature or protected tree.
OAK_WILT_VIOLATION Structural_Risk_Reduction_Pruning during active seasonal_oak_wilt_restriction_active Blocks non-emergency pruning of Quercus hosts during prohibited Ceratocystis fagacearum nitidulid beetle vector months.
INCOMPLETE_SOIL_DATA Missing bulk_density_g_cm3, organic_matter_pct, or infiltration_rate_mm_hr Requires quantitative soil physical baseline prior to certifying a regenerative rhizosphere prescription.
Section 2

Mathematical & Primary Literature Foundations

Every number emitted by Open Arbor traces to a published standard or primary scientific paper. Zero opaque heuristics or unverified LLM approximations are permitted in the core calculation kernel.

Mathematical and Primary Literature Foundations of Open Arbor
Domain & Module Equation & Deterministic Formula Primary Literature / Statutory Standard
Critical Root Zone (CRZ) & International TPZ
src/core/rootZone.js		 R_CRZ (ft) = max(min_radius_ft, DBH_in × multiplier)
AS 4970 TPZ: R_m = clamp(DBH_m × 12, 2.0, 15.0)
BS 5837 RPA: R_m = min(DBH_m × 12, 15.0) 		ANSI A300 (Part 5: Management of Trees and Shrubs During Site Planning, Site Development, and Construction); ISA Best Management Practices; Australian Standard AS 4970-2009; UK BS 5837:2012.
Structural Root Zone (SRZ)
src/core/rootZone.js		 R_SRZ (m) = max(1.5, (D_flare_m × 50)^0.42 × 0.64)
(If basal flare D_flare is unmeasured, estimated as 1.2 × DBH) 		Claus Mattheck & Helge Breloer (1994), The Body Language of Trees: A Handbook for Failure Analysis; codified in Australian Standard AS 4970-2009 § 3.3.5.
Multi-Stem DBH Aggregation & 1-ft Grid Union
src/core/rootZone.js		 Quadratic: sqrt(sum(d_i^2))
Largest + Half: d_max + 0.5 × sum(d_other)
Union Area: 1-ft Cartesian raster grid de-duplicating overlapping CRZ circles 		ISA / CTLA Guide for Plant Appraisal (10th Ed.) quadratic mean stem area rule; Austin ECM § 3.5 / Georgetown UDC Ch. 8 / Liberty Hill UDC § 6.07.01 municipal multi-trunk rules.
Hollow-Shell Buckling Stability (t/R)
src/core/rcaEngine.js		 t/R = t_sound_shell_cm / R_trunk_radius_cm
Stable criterion: t/R ≥ 0.30 (retains full hollow-cylinder bending resistance) 		Mattheck, C., Bethge, K., & Erb, D. (1993/1994), failure criteria for hollow tree trunks under bending and Brazier ovalization; Shigo, A. L. (1977) CODIT Walls 1 to 4.
Pneumatic Rhizosphere & Amendment Scaling
src/core/rcaEngine.js		 V_trench = N_spokes × L_m × W_m × D_m
V_basin = π × R_rce^2 × D_burial_m
Biochar = 8% V_total; Compost = 15% V_total; Humate = 1.5 kg/m3; Mulch = 8 cm × A_TIZ 		ANSI A300 Part 2 (Soil Management: Modification, Fertilization, and Drainage); ISA BMP Soil Management for Urban Trees; RCA-Spec v2.0 Domain 2 & Domain 4 prescriptions.
Allometric Carbon, Stormwater, Air & Cooling
src/core/ecosystemBenefits.js		 AGB_kg = exp(-2.0773 + 2.3323 × ln(DBH_cm))
Total_Biomass = AGB × 1.28 (root shoot ratio) × 0.8 (urban open-grown factor)
Carbon_kg = 0.50 × Total_Biomass; CO2_eq = 3.6667 × Carbon 		Nowak, D. J. (1994) urban forest carbon storage; Cairns et al. (1997) root-to-shoot biomass allocation; Xiao et al. (2000) rainfall interception; Nowak et al. (2006) dry deposition air pollution removal; McPherson & Simpson (1999) shade cooling calibrated to ~80 kWh/tree baseline.
Veteran Tree Age Estimation
src/core/ecosystemBenefits.js		 Age_yrs = DBH_cm × (Base_Growth_Factor × Site_Modifier)
(Modifiers: Open Grown 0.85x, Urban Street 1.10x, Woodland 1.15x) 		John White (1998), Estimating the Age of Large and Veteran Trees in Britain, UK Forestry Commission Information Note FCIN12, calibrated with North American species growth factors.
Dual Valuation: Holobiont Equity vs. CTLA 10th Ed.
src/core/rcaEngine.js		 CTLA = (π/4 × DBH_in^2 × $75) × f_cond × f_loc
Holobiont = (E_carbon_200yr + E_hydrology_50yr + E_CMN_soil) × M_habitat
(Keystone multiplier M_habitat: 1.2x up to 3.5x for veteran hollow trees) 		Council of Tree and Landscape Appraisers (CTLA) Guide for Plant Appraisal (10th Ed., 2018) Trunk Formula Technique vs. RCA-Spec v2.0 Holobiont Biological Equity model (STIM Axiom 7).
Section 3

200-Year Data Sovereignty & Heartwood Vault Architecture (2026 to 2226)

A Live Oak, Pecan, or Oregon White Oak preserved today will stand in 2226. Over those two centuries, every proprietary cloud SaaS database and binary lock-in format will vanish. Open Arbor enforces 200-Year Data Sovereignty (docs/13_STRATEGIC_SPEC_2031_SOVEREIGN_ARCHITECTURE.md, STIM Protocol v7.0011) through the Four-Namespace Botanical Directory Contract and the Heartwood/Cambium Dual-File Pattern.

1. SEEDS/ Immutable Evidence Write-once primary evidence: official municipal ordinance PDFs with .sha256 sidecars, raw GPR radargrams (.dzt), LiDAR point clouds (.copc.laz), increment cores, and wild mother-tree germplasm manifests.
2. ARBORETUM/ Living Dossiers Active cultivated projects, property Tree Preservation Plans, dual-file tree dossiers (Heartwood .md + Cambium .jsonld/.geojson), and open-nursery propagation batches.
3. UNDERSTORY/ Deterministic Kernel Zero-dependency ECMAScript core modules (rootZone.js, ordinanceEngine.js, ecosystemBenefits.js, rcaEngine.js, leoRcaEngine.js, soilFunction.js), Draft 2020-12 JSON Schemas, and the 41-tool forestry workbench catalog.
4. HEARTWOOD/ Bioregional Law Watershed-scale growth and fire syntheses (Open-FVS, LANDIS-II, FlamMap), bioregional Oak Wilt epidemiology fronts, and Equinox/Solstice archival digests.
Fundamental Reconstructibility Invariant (Cambium = compile(Heartwood, SEEDS)): Every tree assessment is saved as human-readable UTF-8 Markdown (the Heartwood file, legible in 2226 with any plain-text reader) paired with its deterministic machine-executable Cambium companion (RCA_v2 JSON, OGC CRS84 GeoJSON, to-scale SVG protection map, and OpenBadgeCredential JSON-LD). Every artifact is sealed with a canonical sorted-key SHA-256 digest via computeCanonicalSha256.
Section 4

Interactive JSON Schema (Draft 2020-12) Inspector

Inspect the property definitions, required constraints, units, and enumerations for Open Arbor's canonical schemas, or download the raw .schema.json files directly.

Flattened JSON Schema Property Definitions
JSONPath Property Type & Constraints Required Specification Description & Unit
Raw Schema View Raw JSON Schema Source (schemas/rca_assessment.schema.json)
Draft 2020-12 JSON Schema Source