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Global source registry — official agencies, sync health, and approved data provenance.
Tier 1 = Official agencies (PAGASA, PHIVOLCS, USGS, NOAA, GDACS). Tier 2 = UN and humanitarian bodies (ReliefWeb, UNICEF, UNHCR). Tier 3 = Research-grade datasets (ACLED, UCDP, World Bank). Tier 4 = Regional and specialised sources (ICAO, EASA, Copernicus). Tier 5 = User uploads; pending until reviewed, and never used for scoring or AI until approved. When sources conflict, the higher-trust source takes precedence.