{
  "id": "grand-isle-2025-v1",
  "version": "1.0.0",
  "station": "8761724",
  "stationName": "Grand Isle, Louisiana",
  "start": "2025-01-01T00:00:00Z",
  "endExclusive": "2026-01-01T00:00:00Z",
  "datum": "MLLW",
  "units": "english",
  "heightUnit": "ft",
  "timeZone": "gmt",
  "observationProduct": "hourly_height",
  "predictionProduct": "predictions",
  "predictionInterval": "h",
  "selectionReason": "Owner-requested extension to the complete calendar year 2025, the latest complete calendar year before this analysis. Fixed before annual retrieval; September pilot retained separately. No selection of months based on outcomes.",
  "pairing": "Exact UTC hourly timestamp on the full 8760-hour calendar-year grid. No interpolation, nearest-neighbor matching or gap filling.",
  "qualityRule": "Include only finite numeric pairs with hourly-height flags I,L both zero. Reject duplicates, off-grid/out-of-period times, wrong station, malformed flags or mismatched request settings. Exclude flagged/missing measurements and report all exclusions.",
  "difference": "observed_ft minus predicted_ft",
  "purpose": "Descriptive within-2025 station comparison of monthly and seasonal water levels and observed-minus-predicted differences. A single year is not a seasonal climatology, catch forecast, current measurement or causal weather study.",
  "reviewStatus": "Local review; technical validation required; independent scientific review not performed.",
  "seasonDefinition": "Meteorological month groups within calendar 2025: winter January, February and December (noncontiguous); spring March-May; summer June-August; fall September-November. Hour-weighted means of admitted exact-time pairs; not an average of monthly means."
}