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 "name": "Route de Tr\u00e9zioux",
 "slug": "route-de-trezioux-2",
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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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   "region_key": "france",
   "crs": "EPSG:2154",
   "elevation_provider_key": "ign-lidarhd",
   "tile_index": "wms-grid",
   "authority": "bdtopo",
   "registry_pbf": "france-vosges-2026-09-16.osm.pbf",
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  "interpolation": "bilinear",
  "smoothing": "none",
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  "elevation_crs": "EPSG:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E737-N6512_0m5@22LHD4ML-2025-09-15.tif",
   "data/cache/fr/ign-lidarhd_dtm_E738-N6512_0m5@22LHD4ML-2025-09-15.tif",
   "data/cache/fr/ign-lidarhd_dtm_E738-N6513_0m5@22LHD4ML-2025-09-15.tif"
  ],
  "calculated_at": "2026-09-22T16:58:08+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-mc5.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-mc5",
  "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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   "E738-N6513"
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  "elevation_blocks": [
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  ],
  "ign_dalles": [
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   "LHD_FXX_0738_6513_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0738_6514_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD4ML"
  ],
  "ign_editions": [
   "2025-09-15"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0737_6513_MNT_O_0M50_LAMB93_IGN69": "2025-09-15",
   "LHD_FXX_0738_6513_MNT_O_0M50_LAMB93_IGN69": "2025-09-15",
   "LHD_FXX_0738_6514_MNT_O_0M50_LAMB93_IGN69": "2025-09-15"
  },
  "climb_origin": "discovered",
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   "stations_resolved": 88,
   "width_median_m": 6.5,
   "width_p10_m": 4.68,
   "width_min_m": 1.5,
   "width_max_m": 11.75,
   "bounded_share": 0.227,
   "unbounded_share": 0.773,
   "confidence_median": 0.0,
   "width_median_bounded_m": 6.38,
   "window_m": [
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   ],
   "width_at_max25_m": 4.5,
   "window_stations": 7,
   "single_track": false,
   "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,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 88,
    "stations_resolved": 88,
    "width_median_m": 8.75,
    "width_p10_m": 3.93,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.591,
    "unbounded_share": 0.409,
    "confidence_median": 0.934,
    "width_median_bounded_m": 7.62,
    "window_m": [
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    "width_at_max25_m": 9.75,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
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  },
  "unmapped_bridge_span_unstable": {
   "start_m": 1604.0,
   "end_m": 1721.0,
   "span_m": 117.0,
   "floor_at_m": 1654.0,
   "depth_m": 8.5,
   "drop_m": 4.4,
   "surface": "raw",
   "window_start_m": 1927.0,
   "window_end_m": 1952.0,
   "gap_m": 206.0,
   "unstable": true,
   "perturbation_hits": 1,
   "perturbations": [
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   ],
   "ruling": "the dip is not found at every sampling phase \u2014 reported, never held on (Peter 2026-09-20, suppression-verdict-stability)",
   "note": "A dip of 4 m below the road between 1604 m and 1721 m is found at some sampling phases and not others (1 of 3). Reported for a person; the page is NOT held on it (suppression-verdict-stability, Peter 2026-09-20)."
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Saint-Flour-l'\u00c9tang",
  "county": "Puy-de-D\u00f4me",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}