{"exported_at":"2026-09-24T18:51:48.024435+00:00","snapshot_type":"read-only export of existing immutable archive objects","selection":{"latitude":51.5074,"longitude":-0.1278,"radius_km":50.0,"distance_method":"haversine; mean Earth radius 6371.0088 km"},"feature_count":3642,"recent_7_days_feature_count":736,"feeds":{"ea_flood":{"latest_run":{"id":39,"provider":"ea_flood","collection_day":"2026-09-24","started_at":"2026-09-24T18:45:00.009135+00:00","finished_at":"2026-09-24T18:45:19.611532+00:00","status":"succeeded"},"archived_objects_read":3,"discovered_station_count":65,"feature_count":78,"mapped_station_count":61,"recent_7_days_feature_count":78,"older_feature_count":0,"observed_at_range_raw":["2026-09-24T10:00:00Z","2026-09-24T18:15:00Z"],"categories":{"water-level":74,"water-flow":4},"missing_unit_feature_count":0,"exclusions":{}},"ea_hydrology":{"latest_run":{"id":41,"provider":"ea_hydrology","collection_day":"2026-09-24","started_at":"2026-09-24T18:45:00.009214+00:00","finished_at":"2026-09-24T18:49:20.863835+00:00","status":"succeeded"},"archived_objects_read":40,"discovered_station_count":1917,"feature_count":3564,"mapped_station_count":981,"recent_7_days_feature_count":658,"older_feature_count":2906,"observed_at_range_raw":["2010-09-01T02:03:00","2026-09-24T18:32:11"],"categories":{"groundwater":357,"water-quality":1534,"rainfall":211,"water-level":958,"water-flow":504},"missing_unit_feature_count":0,"exclusions":{"missing_or_nonnumeric_value":9}}},"licence":"https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/","attribution":"Contains Environment Agency information © Environment Agency and/or database right.","notes":["One feature per source measurement series. Different periods/statistics/datums and overlapping feeds are not merged.","Older latest readings are retained for an explicit older-data view; is_recent is calculated at export time, never from retrieval time.","observed_at is unchanged. Timezone-free Hydrology timestamps are treated as UTC only for approximate age and ordering; timezone_explicit identifies these cases.","Missing/nonnumeric values, future dates and out-of-radius stations are excluded with per-feed counts. No hazard, trend or swimming-safety classification is inferred.","Unit enrichment preserves source readings and timestamps. unit_provenance distinguishes supplied metadata from checked EA Hydrology identifier definitions; unresolved/conflicting units remain null."],"unit_resolution":{"method":"ea-hydrology-unit-v1","resolved_at":"2026-09-24T22:34:04.779196+00:00","newly_resolved_feature_count":3564,"remaining_missing_feature_count":0,"evidence":"unit-resolution-evidence.json"}}