{
 "ocl_version": "0.1.0",
 "name": "Chemin Bourtoul",
 "slug": "chemin-bourtoul",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.9713619302552,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 122.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 98.58884084310796,
   "end_elevation_m": 99.10826808171306,
   "min_gradient_pct": -4.235389524291833
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.635762705744014,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 121.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 98.33919520054074,
   "end_elevation_m": 99.10826808171306,
   "min_gradient_pct": -3.595512088521957
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.3953946408231,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 119.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 97.83849834967191,
   "end_elevation_m": 99.10826808171306,
   "min_gradient_pct": -1.3221412117641762
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.095334850019583,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 114.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 96.6987345967111,
   "end_elevation_m": 99.10826808171306,
   "min_gradient_pct": 3.7033356686762886
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.40962244833753,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 115.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 96.8997597971135,
   "end_elevation_m": 101.38168428678101,
   "min_gradient_pct": 5.650172813722065
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.974625818435978,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 96.49230540112056,
   "end_elevation_m": 101.98596185572956,
   "min_gradient_pct": 7.064852755942411
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.37151272581869,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 92.16571225103868,
   "end_elevation_m": 102.35146861394803,
   "min_gradient_pct": 8.064446398030725
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.94529252979872,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 80.82940850650024,
   "end_elevation_m": 100.77470103629896,
   "min_gradient_pct": 8.975467874603709
  }
 ],
 "shape": {
  "ascent_concentration": 0.364,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 178.0,
  "shape_class": "sustained"
 },
 "length_m": 392.4886602856757,
 "start_elevation_m": 76.1557721308917,
 "end_elevation_m": 129.84118349365238,
 "endpoint_gain_m": 53.685411362760675,
 "overall_gradient_pct": 13.67820698913578,
 "accumulated_ascent_m": 53.793276725416334,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.3953946408231,
   "start_distance_m": 119.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 121.5,
   "start_elevation_m": 97.83849834967191,
   "end_elevation_m": 99.10826808171306,
   "start_xy": [
    833939.3776336211,
    6385824.849072177
   ],
   "end_xy": [
    833939.0987961795,
    6385829.816124358
   ]
  },
  "max_10m": {
   "gradient_pct": 24.095334850019583,
   "start_distance_m": 114.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 119.0,
   "start_elevation_m": 96.6987345967111,
   "end_elevation_m": 99.10826808171306,
   "start_xy": [
    833938.9356247694,
    6385819.870830451
   ],
   "end_xy": [
    833939.0987961795,
    6385829.816124358
   ]
  },
  "max_20m": {
   "gradient_pct": 22.40962244833753,
   "start_distance_m": 115.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 125.0,
   "start_elevation_m": 96.8997597971135,
   "end_elevation_m": 101.38168428678101,
   "start_xy": [
    833939.0661174239,
    6385820.862279727
   ],
   "end_xy": [
    833930.7679690424,
    6385835.659758036
   ]
  },
  "max_25m": {
   "gradient_pct": 21.974625818435978,
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 125.5,
   "start_elevation_m": 96.49230540112056,
   "end_elevation_m": 101.98596185572956,
   "start_xy": [
    833938.8051321148,
    6385818.879381175
   ],
   "end_xy": [
    833927.8344224279,
    6385835.210336477
   ]
  },
  "max_50m": {
   "gradient_pct": 20.37151272581869,
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 92.16571225103868,
   "end_elevation_m": 102.35146861394803,
   "start_xy": [
    833940.590509579,
    6385796.83334354
   ],
   "end_xy": [
    833926.1148745174,
    6385834.291509564
   ]
  },
  "max_100m": {
   "gradient_pct": 19.94529252979872,
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 80.82940850650024,
   "end_elevation_m": 100.77470103629896,
   "start_xy": [
    833975.9385905686,
    6385829.692017936
   ],
   "end_xy": [
    833933.755715544,
    6385835.41941218
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.3221412117641762,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 76.1557721308917,
   "end_elevation_m": 76.0896650703035,
   "start_xy": [
    833997.393,
    6385809.959
   ],
   "end_xy": [
    833992.6439964275,
    6385811.523277811
   ]
  },
  "min_10m": {
   "gradient_pct": 3.7033356686762886,
   "start_distance_m": 382.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 129.46264402697204,
   "end_elevation_m": 129.83297759383967,
   "start_xy": [
    833852.5274623241,
    6385605.175888125
   ],
   "end_xy": [
    833849.1119047346,
    6385595.777272996
   ]
  },
  "min_20m": {
   "gradient_pct": 5.650172813722065,
   "start_distance_m": 372.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 382.0,
   "start_elevation_m": 128.70294303109526,
   "end_elevation_m": 129.83297759383967,
   "start_xy": [
    833855.9430199135,
    6385614.574503254
   ],
   "end_xy": [
    833849.1119047346,
    6385595.777272996
   ]
  },
  "min_25m": {
   "gradient_pct": 7.064852755942411,
   "start_distance_m": 367.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 379.5,
   "start_elevation_m": 128.06676440485407,
   "end_elevation_m": 129.83297759383967,
   "start_xy": [
    833857.6507987082,
    6385619.27381082
   ],
   "end_xy": [
    833849.1119047346,
    6385595.777272996
   ]
  },
  "min_50m": {
   "gradient_pct": 8.064446398030725,
   "start_distance_m": 189.0,
   "end_distance_m": 239.0,
   "midpoint_distance_m": 214.0,
   "start_elevation_m": 109.20386844664391,
   "end_elevation_m": 113.23609164565927,
   "start_xy": [
    833908.4494573401,
    6385789.406622597
   ],
   "end_xy": [
    833893.586631368,
    6385741.671917113
   ]
  },
  "min_100m": {
   "gradient_pct": 8.975467874603709,
   "start_distance_m": 174.0,
   "end_distance_m": 274.0,
   "midpoint_distance_m": 224.0,
   "start_elevation_m": 107.82217300090352,
   "end_elevation_m": 116.79764087550723,
   "start_xy": [
    833911.7173370832,
    6385804.002848359
   ],
   "end_xy": [
    833883.839656998,
    6385708.0564966835
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.9713619302552,
   "start_distance_m": 122.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 98.58884084310796,
   "end_elevation_m": 99.10826808171306,
   "start_xy": [
    833939.3722145769,
    6385827.834901912
   ],
   "end_xy": [
    833939.0987961795,
    6385829.816124358
   ]
  },
  "max_3m": {
   "gradient_pct": 25.635762705744014,
   "start_distance_m": 121.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 122.5,
   "start_elevation_m": 98.33919520054074,
   "end_elevation_m": 99.10826808171306,
   "start_xy": [
    833939.5089237757,
    6385826.844290689
   ],
   "end_xy": [
    833939.0987961795,
    6385829.816124358
   ]
  }
 },
 "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": 0.185,
   "obstruction_max_height_m": 14.14,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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_E833-N6385_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E834-N6385_0m5.tif"
  ],
  "calculated_at": "2026-09-17T04:18:57+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": [
   "E833-N6385",
   "E834-N6385"
  ],
  "elevation_blocks": [
   "22LHD5NN@2025-06-04"
  ],
  "ign_dalles": [
   "LHD_FXX_0833_6386_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0834_6386_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD5NN"
  ],
  "ign_editions": [
   "2025-06-04"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0833_6386_MNT_O_0M50_LAMB93_IGN69": "2025-06-04",
   "LHD_FXX_0834_6386_MNT_O_0M50_LAMB93_IGN69": "2025-06-04"
  },
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 22,
   "stations_resolved": 22,
   "width_median_m": 6.5,
   "width_p10_m": 5.25,
   "width_min_m": 4.25,
   "width_max_m": 12.0,
   "bounded_share": 0.364,
   "unbounded_share": 0.636,
   "confidence_median": 0.0,
   "width_median_bounded_m": 6.88,
   "window_m": [
    113.0,
    138.0
   ],
   "width_at_max25_m": 8.0,
   "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": 22,
    "stations_resolved": 22,
    "width_median_m": 3.12,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.909,
    "unbounded_share": 0.091,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.0,
    "window_m": [
     113.0,
     138.0
    ],
    "width_at_max25_m": 1.5,
    "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": "Le Teil",
  "county": "Ard\u00e8che",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}