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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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    25
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  "extent": [
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  "interpolation": "bilinear",
  "smoothing": "none",
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   25.0,
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  "elevation_crs": "EPSG:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E1040-N6300_0m5.tif"
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  "calculated_at": "2026-09-17T02:53:18+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps4.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps4",
  "elevation_provider": "IGN LiDAR HD MNT 0.5 m",
  "elevation_licence": "Licence Ouverte / Open Licence 2.0 (Etalab) \u2014 \u00a9 IGN, LiDAR HD (MNT/MNS), data.geopf.fr; reproduction autoris\u00e9e avec mention de la source et de la date",
  "elevation_dataset": "LiDAR HD \u2014 MNT (sol) et MNS (surface), 0,50 m (Institut national de l'information g\u00e9ographique et foresti\u00e8re), RGF93 / Lambert-93 EPSG:2154, altitudes IGN69",
  "elevation_vertical_datum": "IGN69",
  "elevation_tile_ids": [
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  "elevation_blocks": [
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  ],
  "ign_dalles": [
   "LHD_FXX_1040_6301_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD8SP"
  ],
  "ign_editions": [
   "2025-06-20"
  ],
  "ign_dsm_edition": {
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  "route_summit_trim_m": 67.5,
  "route_summit_trim_loss_m": 7.2,
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
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   "stations_resolved": 20,
   "width_median_m": 4.38,
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   "width_min_m": 1.25,
   "width_max_m": 8.25,
   "bounded_share": 0.8,
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   "confidence_median": 0.877,
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   "window_m": [
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   "width_at_max25_m": 4.5,
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   "single_track": true,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
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   "stations_failed": 0,
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    "bounded_share": 1.0,
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    "window_stations": 7,
    "status": "ok",
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    "step_m": 0.25,
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  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Nice",
  "county": "Alpes-Maritimes",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}