/**
 * Is this one ground, or two? The physical half of venue identity — capacity
 * and position — kept apart from the name half.
 *
 * Names cannot answer this question and never could. "Anfield" is a whole-word
 * subset of "Anfield Sports and Community Centre", "Şəhər stadionu" is what the
 * supplier calls both Tovuz's and Ganja's city stadiums, and two Buenos Aires
 * grounds are both "Estadio Islas Malvinas". In each case the names agree and
 * the grounds do not — a 61,276-seat stadium is not a 1,000-capacity artificial
 * pitch a kilometre away, whatever they are called.
 *
 * **A missing measurement is evidence of a different KIND of ground, not
 * licence to skip the test.** This is the inversion the module exists for. The
 * ven-8 venue tooling guarded capacity as
 *
 *     if (ca && cb && Math.min(ca, cb) / Math.max(ca, cb) < CAPACITY_TOLERANCE)
 *
 * which protects only the pairs where BOTH numbers are known — the pairs least
 * likely to be wrong — while the side that lacks a capacity is systematically
 * the small ground. That is how Liverpool FC's Anfield came to hold supplier id
 * 12137, Anfield Sports Community Centre, and why Lower Breck's fixtures
 * rendered at a Premier League stadium. So `unknown` is its own verdict here
 * and callers must decide what to do with it; it is never silently `same`.
 *
 * Distance is the weaker half and is deliberately secondary: the community
 * centre is 1.13km from Anfield, so a 1km proximity rule barely separated them,
 * while the capacity ratio was 0.016.
 *
 * Two callers, one rule (the `deriveGlobalRanks` precedent):
 * `weekendgoals-scraper/src/venues/venue-claim-verification.ts` at fixture
 * time, where a claimed venue rarely states either measurement, and
 * `api-gateway/scripts/audit-absorbed-venue-ids.ts`, which asks the supplier
 * for both records precisely so it can.
 */
/** Two known capacities at least this close describe one ground. */
export declare const CAPACITY_SAME_GROUND_RATIO = 0.9;
/**
 * Two known capacities further apart than this are not one ground under any
 * reading. Between this and `CAPACITY_SAME_GROUND_RATIO` is a renovation, and
 * the band is calibrated on the widest legitimate one measured: Vejlby
 * Stadion's 5,200 and Ceres Park Vejlby's 12,000 are the same stadium before
 * and after its 2024-25 rebuild — a ratio of **0.433** — and
 * `api-gateway/scripts/reviewed/vejlby-stadium-merge.csv` merged them on
 * evidence. So the floor sits clear below that rather than at a round 0.5,
 * which would have called that merge `different`.
 *
 * A ground whose capacity changed by more than this has not been renovated; it
 * has been replaced, and a replacement usually moves too. Every wrong absorb in
 * the 2026-08-27 audit that this catches is far below it — Anfield 0.016, Braga
 * 0.041, Gran Canaria 0.062, Ganja 0.260 — and the two that sit above (Szegedi
 * 0.363, Frosinone 0.620) are caught by distance instead, which is the point of
 * having both halves.
 */
export declare const CAPACITY_DIFFERENT_GROUND_RATIO = 0.3;
/** Coordinates this close are the same place. */
export declare const SAME_SPOT_KM = 1;
export interface VenuePhysical {
    capacity?: number | null;
    /** GeoJSON order: `[longitude, latitude]`. */
    coordinates?: [number, number] | number[] | null;
}
export type VenueIdentityVerdict = "same" | "different" | "unknown";
export interface VenueIdentityAssessment {
    verdict: VenueIdentityVerdict;
    reason: string;
    /** `min/max` of the two capacities, when both are known. */
    capacityRatio?: number;
    /** Great-circle kilometres, when both coordinates are known. */
    distanceKm?: number;
}
/** Great-circle distance in km between two `[longitude, latitude]` points. */
export declare function haversineKm(a: [number, number] | number[], b: [number, number] | number[]): number;
/**
 * Assess two grounds on their physical measurements alone, saying nothing about
 * their names.
 *
 * `different` is returned only on evidence: capacities more than
 * `CAPACITY_DIFFERENT_GROUND_RATIO` apart, or positions more than
 * `SAME_SPOT_KM` apart. Capacity is checked first because it is the stronger
 * signal — the Anfield pair was 0.016 on capacity and only 1.13km on distance.
 *
 * `unknown` means a measurement is missing on at least one side. A caller that
 * treats `unknown` as `same` has rebuilt the bug this module documents.
 */
export declare function assessVenueIdentity(a: VenuePhysical, b: VenuePhysical): VenueIdentityAssessment;
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