{
 "ocl_version": "0.1.0",
 "name": "Route des 4 Chemins",
 "slug": "route-des-4-chemins-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.953611966511517,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1249.0,
   "end_distance_m": 1251.0,
   "start_elevation_m": 646.4803835768579,
   "end_elevation_m": 647.0594558161881,
   "min_gradient_pct": -9.843667306881798
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.309160410418524,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1248.0,
   "end_distance_m": 1251.0,
   "start_elevation_m": 646.2701810038756,
   "end_elevation_m": 647.0594558161881,
   "min_gradient_pct": -9.737621916512277
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.795984931773546,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1228.0,
   "end_distance_m": 1233.0,
   "start_elevation_m": 641.955126742346,
   "end_elevation_m": 643.1449259889347,
   "min_gradient_pct": -8.97206455695823
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.863080521433403,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1226.0,
   "end_distance_m": 1236.0,
   "start_elevation_m": 641.5092533619443,
   "end_elevation_m": 643.7955614140876,
   "min_gradient_pct": -7.126040502967044
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.220238247798534,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1220.0,
   "end_distance_m": 1240.0,
   "start_elevation_m": 640.2317760937335,
   "end_elevation_m": 644.6758237432932,
   "min_gradient_pct": -5.656585023736511
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.20080981697538,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1226.0,
   "end_distance_m": 1251.0,
   "start_elevation_m": 641.5092533619443,
   "end_elevation_m": 647.0594558161881,
   "min_gradient_pct": -4.46658685452303
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.924269186351466,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1201.0,
   "end_distance_m": 1251.0,
   "start_elevation_m": 636.5973212230124,
   "end_elevation_m": 647.0594558161881,
   "min_gradient_pct": 0.04936424475476997
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.038229278936683,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1161.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 630.7323651360517,
   "end_elevation_m": 648.7705944149884,
   "min_gradient_pct": 2.0251975018528583
  }
 ],
 "shape": {
  "ascent_concentration": 0.491,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 152.0,
  "shape_class": "stepped"
 },
 "length_m": 1732.7574178167727,
 "start_elevation_m": 572.9877274960978,
 "end_elevation_m": 679.7909924863308,
 "endpoint_gain_m": 106.80326499023295,
 "overall_gradient_pct": 6.16377479571273,
 "accumulated_ascent_m": 108.4379017082291,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.795984931773546,
   "start_distance_m": 1228.0,
   "end_distance_m": 1233.0,
   "midpoint_distance_m": 1230.5,
   "start_elevation_m": 641.955126742346,
   "end_elevation_m": 643.1449259889347,
   "start_xy": [
    931733.7223297011,
    6367860.773883246
   ],
   "end_xy": [
    931732.2427252848,
    6367855.99782098
   ]
  },
  "max_10m": {
   "gradient_pct": 22.863080521433403,
   "start_distance_m": 1226.0,
   "end_distance_m": 1236.0,
   "midpoint_distance_m": 1231.0,
   "start_elevation_m": 641.5092533619443,
   "end_elevation_m": 643.7955614140876,
   "start_xy": [
    931734.3141714676,
    6367862.684308153
   ],
   "end_xy": [
    931731.4734713893,
    6367853.103231007
   ]
  },
  "max_20m": {
   "gradient_pct": 22.220238247798534,
   "start_distance_m": 1220.0,
   "end_distance_m": 1240.0,
   "midpoint_distance_m": 1230.0,
   "start_elevation_m": 640.2317760937335,
   "end_elevation_m": 644.6758237432932,
   "start_xy": [
    931736.0896967672,
    6367868.415582872
   ],
   "end_xy": [
    931730.7620411062,
    6367849.167006046
   ]
  },
  "max_25m": {
   "gradient_pct": 22.20080981697538,
   "start_distance_m": 1226.0,
   "end_distance_m": 1251.0,
   "midpoint_distance_m": 1238.5,
   "start_elevation_m": 641.5092533619443,
   "end_elevation_m": 647.0594558161881,
   "start_xy": [
    931734.3141714676,
    6367862.684308153
   ],
   "end_xy": [
    931730.4944949561,
    6367838.1832594145
   ]
  },
  "max_50m": {
   "gradient_pct": 20.924269186351466,
   "start_distance_m": 1201.0,
   "end_distance_m": 1251.0,
   "midpoint_distance_m": 1226.0,
   "start_elevation_m": 636.5973212230124,
   "end_elevation_m": 647.0594558161881,
   "start_xy": [
    931741.7121935491,
    6367886.564619483
   ],
   "end_xy": [
    931730.4944949561,
    6367838.1832594145
   ]
  },
  "max_100m": {
   "gradient_pct": 18.038229278936683,
   "start_distance_m": 1161.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1211.0,
   "start_elevation_m": 630.7323651360517,
   "end_elevation_m": 648.7705944149884,
   "start_xy": [
    931766.5422965856,
    6367914.420201474
   ],
   "end_xy": [
    931730.3538860662,
    6367828.184248006
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.97206455695823,
   "start_distance_m": 1651.0,
   "end_distance_m": 1656.0,
   "midpoint_distance_m": 1653.5,
   "start_elevation_m": 676.1611462160215,
   "end_elevation_m": 675.7125429881736,
   "start_xy": [
    931496.632433502,
    6367777.824333838
   ],
   "end_xy": [
    931491.9855100625,
    6367779.669896774
   ]
  },
  "min_10m": {
   "gradient_pct": -7.126040502967044,
   "start_distance_m": 1646.0,
   "end_distance_m": 1656.0,
   "midpoint_distance_m": 1651.0,
   "start_elevation_m": 676.4251470384703,
   "end_elevation_m": 675.7125429881736,
   "start_xy": [
    931501.2793569413,
    6367775.978770903
   ],
   "end_xy": [
    931491.9855100625,
    6367779.669896774
   ]
  },
  "min_20m": {
   "gradient_pct": -5.656585023736511,
   "start_distance_m": 1641.0,
   "end_distance_m": 1661.0,
   "midpoint_distance_m": 1651.0,
   "start_elevation_m": 676.6647372229683,
   "end_elevation_m": 675.533420218221,
   "start_xy": [
    931505.9262803808,
    6367774.1332079675
   ],
   "end_xy": [
    931487.3414519121,
    6367781.5225152755
   ]
  },
  "min_25m": {
   "gradient_pct": -4.46658685452303,
   "start_distance_m": 1639.0,
   "end_distance_m": 1664.0,
   "midpoint_distance_m": 1651.5,
   "start_elevation_m": 676.6734229400605,
   "end_elevation_m": 675.5567762264297,
   "start_xy": [
    931507.7850497565,
    6367773.394982793
   ],
   "end_xy": [
    931484.5706871261,
    6367782.672672874
   ]
  },
  "min_50m": {
   "gradient_pct": 0.04936424475476997,
   "start_distance_m": 1625.0,
   "end_distance_m": 1675.0,
   "midpoint_distance_m": 1650.0,
   "start_elevation_m": 676.3052940460585,
   "end_elevation_m": 676.3299761684359,
   "start_xy": [
    931519.4070095188,
    6367770.761463269
   ],
   "end_xy": [
    931474.2752060506,
    6367786.533699987
   ]
  },
  "min_100m": {
   "gradient_pct": 2.0251975018528583,
   "start_distance_m": 41.0,
   "end_distance_m": 141.0,
   "midpoint_distance_m": 91.0,
   "start_elevation_m": 573.9836954565664,
   "end_elevation_m": 576.0088929584192,
   "start_xy": [
    932656.7609686118,
    6367656.067975808
   ],
   "end_xy": [
    932557.1880720392,
    6367655.514603392
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.953611966511517,
   "start_distance_m": 1249.0,
   "end_distance_m": 1251.0,
   "midpoint_distance_m": 1250.0,
   "start_elevation_m": 646.4803835768579,
   "end_elevation_m": 647.0594558161881,
   "start_xy": [
    931730.5226167341,
    6367840.183061696
   ],
   "end_xy": [
    931730.4944949561,
    6367838.1832594145
   ]
  },
  "max_3m": {
   "gradient_pct": 26.309160410418524,
   "start_distance_m": 1248.0,
   "end_distance_m": 1251.0,
   "midpoint_distance_m": 1249.5,
   "start_elevation_m": 646.2701810038756,
   "end_elevation_m": 647.0594558161881,
   "start_xy": [
    931730.536677623,
    6367841.182962837
   ],
   "end_xy": [
    931730.4944949561,
    6367838.1832594145
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.109,
   "obstruction_max_height_m": 15.55,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": []
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
   5.0,
   10.0,
   20.0,
   25.0,
   50.0,
   100.0
  ],
  "diagnostic_windows_m": [
   2.0,
   3.0
  ],
  "elevation_crs": "EPSG:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E931-N6367_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E931-N6368_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E932-N6367_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E932-N6368_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:01:02+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps3.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps3",
  "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": [
   "E931-N6367",
   "E931-N6368",
   "E932-N6367",
   "E932-N6368"
  ],
  "elevation_blocks": [
   "21LHD7PO@2025-04-02"
  ],
  "ign_dalles": [
   "LHD_FXX_0931_6368_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0931_6369_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0932_6368_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0932_6369_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD7PO"
  ],
  "ign_editions": [
   "2025-04-02"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0931_6368_MNT_O_0M50_LAMB93_IGN69": "2025-04-02",
   "LHD_FXX_0931_6369_MNT_O_0M50_LAMB93_IGN69": "2025-04-02",
   "LHD_FXX_0932_6368_MNT_O_0M50_LAMB93_IGN69": "2025-04-02",
   "LHD_FXX_0932_6369_MNT_O_0M50_LAMB93_IGN69": "2025-04-02"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 7,
  "carriageway": {
   "stations": 76,
   "stations_resolved": 76,
   "width_median_m": 6.5,
   "width_p10_m": 4.75,
   "width_min_m": 2.0,
   "width_max_m": 11.25,
   "bounded_share": 0.184,
   "unbounded_share": 0.816,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.88,
   "window_m": [
    1226.0,
    1251.0
   ],
   "width_at_max25_m": 6.25,
   "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": 76,
    "stations_resolved": 76,
    "width_median_m": 7.62,
    "width_p10_m": 1.12,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.697,
    "unbounded_share": 0.303,
    "confidence_median": 1.0,
    "width_median_bounded_m": 6.5,
    "window_m": [
     1226.0,
     1251.0
    ],
    "width_at_max25_m": 8.25,
    "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
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Ventavon",
  "county": "Hautes-Alpes",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}