{
 "ocl_version": "0.1.0",
 "name": "Chemin de Montchamp",
 "slug": "chemin-de-montchamp",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.236547825630964,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 876.0,
   "end_distance_m": 878.0,
   "start_elevation_m": 179.70404433351382,
   "end_elevation_m": 180.26877529002644,
   "min_gradient_pct": -1.640204073088114
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.543501903387284,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 934.0,
   "end_distance_m": 937.0,
   "start_elevation_m": 188.75155085232302,
   "end_elevation_m": 189.51785590942464,
   "min_gradient_pct": -0.9864454524243153
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.73775199872398,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 876.0,
   "end_distance_m": 881.0,
   "start_elevation_m": 179.70404433351382,
   "end_elevation_m": 180.89093193345002,
   "min_gradient_pct": -0.8772354052746323
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.437518460258445,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 934.0,
   "end_distance_m": 944.0,
   "start_elevation_m": 188.75155085232302,
   "end_elevation_m": 190.99530269834887,
   "min_gradient_pct": 0.6992341503601551
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 19.80230858340107,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 925.0,
   "end_distance_m": 945.0,
   "start_elevation_m": 187.1640910101396,
   "end_elevation_m": 191.12455272681981,
   "min_gradient_pct": 1.393445336898509
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 18.962593230054722,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 919.0,
   "end_distance_m": 944.0,
   "start_elevation_m": 186.25465439083519,
   "end_elevation_m": 190.99530269834887,
   "min_gradient_pct": 1.6860547387869929
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.193264736534502,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1841.0,
   "end_distance_m": 1891.0,
   "start_elevation_m": 311.59356379467727,
   "end_elevation_m": 320.6901961629445,
   "min_gradient_pct": 1.803048998431791
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.470879497245505,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1800.0,
   "end_distance_m": 1900.0,
   "start_elevation_m": 304.7088391306556,
   "end_elevation_m": 322.1797186279011,
   "min_gradient_pct": 2.338736235879651
  }
 ],
 "shape": {
  "ascent_concentration": 0.35,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 247.0,
  "shape_class": "sustained"
 },
 "length_m": 1959.8251591128833,
 "start_elevation_m": 124.3883641841999,
 "end_elevation_m": 327.62249754723575,
 "endpoint_gain_m": 203.23413336303585,
 "overall_gradient_pct": 10.370013489112976,
 "accumulated_ascent_m": 203.50435984156363,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.73775199872398,
   "start_distance_m": 876.0,
   "end_distance_m": 881.0,
   "midpoint_distance_m": 878.5,
   "start_elevation_m": 179.70404433351382,
   "end_elevation_m": 180.89093193345002,
   "start_xy": [
    839347.607260321,
    6376688.858126629
   ],
   "end_xy": [
    839350.7540567103,
    6376684.974753172
   ]
  },
  "max_10m": {
   "gradient_pct": 22.437518460258445,
   "start_distance_m": 934.0,
   "end_distance_m": 944.0,
   "midpoint_distance_m": 939.0,
   "start_elevation_m": 188.75155085232302,
   "end_elevation_m": 190.99530269834887,
   "start_xy": [
    839377.5984064642,
    6376639.416422046
   ],
   "end_xy": [
    839381.9388151562,
    6376630.407490234
   ]
  },
  "max_20m": {
   "gradient_pct": 19.80230858340107,
   "start_distance_m": 925.0,
   "end_distance_m": 945.0,
   "midpoint_distance_m": 935.0,
   "start_elevation_m": 187.1640910101396,
   "end_elevation_m": 191.12455272681981,
   "start_xy": [
    839373.6920386413,
    6376647.524460676
   ],
   "end_xy": [
    839382.3728560255,
    6376629.506597053
   ]
  },
  "max_25m": {
   "gradient_pct": 18.962593230054722,
   "start_distance_m": 919.0,
   "end_distance_m": 944.0,
   "midpoint_distance_m": 931.5,
   "start_elevation_m": 186.25465439083519,
   "end_elevation_m": 190.99530269834887,
   "start_xy": [
    839371.087793426,
    6376652.929819763
   ],
   "end_xy": [
    839381.9388151562,
    6376630.407490234
   ]
  },
  "max_50m": {
   "gradient_pct": 18.193264736534502,
   "start_distance_m": 1841.0,
   "end_distance_m": 1891.0,
   "midpoint_distance_m": 1866.0,
   "start_elevation_m": 311.59356379467727,
   "end_elevation_m": 320.6901961629445,
   "start_xy": [
    839724.4944120389,
    6376570.53416534
   ],
   "end_xy": [
    839739.9225946071,
    6376609.657309793
   ]
  },
  "max_100m": {
   "gradient_pct": 17.470879497245505,
   "start_distance_m": 1800.0,
   "end_distance_m": 1900.0,
   "midpoint_distance_m": 1850.0,
   "start_elevation_m": 304.7088391306556,
   "end_elevation_m": 322.1797186279011,
   "start_xy": [
    839739.4186837408,
    6376532.34762454
   ],
   "end_xy": [
    839747.4858066953,
    6376614.534402621
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.8772354052746323,
   "start_distance_m": 130.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 132.5,
   "start_elevation_m": 128.54895919094477,
   "end_elevation_m": 128.50509742068104,
   "start_xy": [
    839106.5284855455,
    6377367.558312089
   ],
   "end_xy": [
    839106.3224926486,
    6377362.562557199
   ]
  },
  "min_10m": {
   "gradient_pct": 0.6992341503601551,
   "start_distance_m": 126.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 131.0,
   "start_elevation_m": 128.44567159435312,
   "end_elevation_m": 128.51559500938913,
   "start_xy": [
    839106.6932798631,
    6377371.554916002
   ],
   "end_xy": [
    839106.2812940693,
    6377361.563406221
   ]
  },
  "min_20m": {
   "gradient_pct": 1.393445336898509,
   "start_distance_m": 117.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 127.0,
   "start_elevation_m": 128.26020684565745,
   "end_elevation_m": 128.53889591303715,
   "start_xy": [
    839107.0640670776,
    6377380.547274805
   ],
   "end_xy": [
    839106.2400954899,
    6377360.564255242
   ]
  },
  "min_25m": {
   "gradient_pct": 1.6860547387869929,
   "start_distance_m": 252.0,
   "end_distance_m": 277.0,
   "midpoint_distance_m": 264.5,
   "start_elevation_m": 132.36670058014747,
   "end_elevation_m": 132.7882142648442,
   "start_xy": [
    839121.9376705888,
    6377247.33947425
   ],
   "end_xy": [
    839127.0631271637,
    6377222.870520555
   ]
  },
  "min_50m": {
   "gradient_pct": 1.803048998431791,
   "start_distance_m": 245.0,
   "end_distance_m": 295.0,
   "midpoint_distance_m": 270.0,
   "start_elevation_m": 132.20452888922767,
   "end_elevation_m": 133.10605338844357,
   "start_xy": [
    839120.502542748,
    6377254.190781284
   ],
   "end_xy": [
    839130.7534558974,
    6377205.252873895
   ]
  },
  "min_100m": {
   "gradient_pct": 2.338736235879651,
   "start_distance_m": 195.0,
   "end_distance_m": 295.0,
   "midpoint_distance_m": 245.0,
   "start_elevation_m": 130.76731715256392,
   "end_elevation_m": 133.10605338844357,
   "start_xy": [
    839110.2268647235,
    6377303.123488344
   ],
   "end_xy": [
    839130.7534558974,
    6377205.252873895
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.236547825630964,
   "start_distance_m": 876.0,
   "end_distance_m": 878.0,
   "midpoint_distance_m": 877.0,
   "start_elevation_m": 179.70404433351382,
   "end_elevation_m": 180.26877529002644,
   "start_xy": [
    839347.607260321,
    6376688.858126629
   ],
   "end_xy": [
    839348.8452433719,
    6376687.289149776
   ]
  },
  "max_3m": {
   "gradient_pct": 25.543501903387284,
   "start_distance_m": 934.0,
   "end_distance_m": 937.0,
   "midpoint_distance_m": 935.5,
   "start_elevation_m": 188.75155085232302,
   "end_elevation_m": 189.51785590942464,
   "start_xy": [
    839377.5984064642,
    6376639.416422046
   ],
   "end_xy": [
    839378.9005290718,
    6376636.713742502
   ]
  }
 },
 "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": 0.215,
   "obstruction_max_height_m": 13.85,
   "flagged_windows_m": [
    2,
    5,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_continue_beyond_end"
  ]
 },
 "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_E839-N6376_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E839-N6377_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:17:48+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps1.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps1",
  "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": [
   "E839-N6376",
   "E839-N6377"
  ],
  "elevation_blocks": [
   "22LHD6OO@2025-03-14"
  ],
  "ign_dalles": [
   "LHD_FXX_0839_6377_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0839_6378_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD6OO"
  ],
  "ign_editions": [
   "2025-03-14"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0839_6377_MNT_O_0M50_LAMB93_IGN69": "2025-03-14",
   "LHD_FXX_0839_6378_MNT_O_0M50_LAMB93_IGN69": "2025-03-14"
  },
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 85,
   "stations_resolved": 85,
   "width_median_m": 4.5,
   "width_p10_m": 2.5,
   "width_min_m": 1.25,
   "width_max_m": 9.75,
   "bounded_share": 0.388,
   "unbounded_share": 0.612,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.0,
   "window_m": [
    919.0,
    944.0
   ],
   "width_at_max25_m": 3.0,
   "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": 85,
    "stations_resolved": 85,
    "width_median_m": 4.25,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.753,
    "unbounded_share": 0.247,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.0,
    "window_m": [
     919.0,
     944.0
    ],
    "width_at_max25_m": 4.5,
    "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": "Malataverne",
  "county": "Dr\u00f4me",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}