H10 — Glossary

Term	Meaning
Section	Directed interval between consecutive stations, with duration `T` — public comparison unit
Derived features	Metrics / spectra — default upload
Raw audio	PCM waveform — on device by default
Tiers A–E	Contribution quality grades; not interchangeable on the map
Survey-grade at best	Ceiling for in-service crowd data; never engineering-grade / Class 1 equivalence
Objective vs subjective	Acoustics vs perception — never one unexplained score
London-first portable schema	Pilot Underground; core model stays generic railway
Non-affiliation	Not TfL-operated / approved / endorsed
Pseudonymous	Identifiers replaced but re-ID possible — still personal data
CLG	Company limited by guarantee — default incorporation form (ADR-013)
Legal pack	Canon drafts under `machine/governance/legal/`

Consistency rules