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 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
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 },
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  "interpolation": "bilinear",
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  "elevation_tiles": [
   "data/cache/ni/belfast-city-2006/dtm/329374.asc",
   "data/cache/ni/belfast-city-2006/dtm/330374.asc"
  ],
  "calculated_at": "2026-08-19T00:22:14+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/root/ni-survey/ireland-and-northern-ireland-2026-08-18.osm.pbf",
  "osm_snapshot": "2026-08-17T20:21:36Z",
  "elevation_provider": "OpenDataNI (OSNI / DfI Rivers River Basin LiDAR)",
  "elevation_licence": "Open Government Licence v3 \u2014 Crown copyright; Belfast City 2006 data \u00a9 Cyient Europe Ltd, published as open data by DfI",
  "elevation_dataset": "DfI Rivers Belfast City LiDAR 0.5 m DTM/DSM (March 2006)",
  "elevation_tile_ids": [
   "329374",
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  "elevation_attribution_extra": "Derived data \u00a9 Cyient Europe Ltd (published as open data by DfI)",
  "climb_origin": "discovered",
  "notes": "EXTENDED by graph walk: +2 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Adopted 2026-08-18 (NI launch set \u2014 see docs/ni-coverage-survey.md)."
 },
 "area": {
  "place": "Belfast",
  "county": "County Antrim"
 }
}