{
 "ocl_version": "0.1.0",
 "name": "Chemin de Montfort",
 "slug": "chemin-de-montfort",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.642538716853892,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 792.0,
   "end_distance_m": 794.0,
   "start_elevation_m": 416.5816703461233,
   "end_elevation_m": 417.1145211204604,
   "min_gradient_pct": 0.21612964627024667
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.748600564547058,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 779.0,
   "end_distance_m": 782.0,
   "start_elevation_m": 413.8601827951304,
   "end_elevation_m": 414.6326408120668,
   "min_gradient_pct": 1.086253174042895
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.032873482466584,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 779.0,
   "end_distance_m": 784.0,
   "start_elevation_m": 413.8601827951304,
   "end_elevation_m": 415.11182646925374,
   "min_gradient_pct": 1.3622254088829777
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.652957369928686,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 774.0,
   "end_distance_m": 784.0,
   "start_elevation_m": 412.8465307322609,
   "end_elevation_m": 415.11182646925374,
   "min_gradient_pct": 2.1955462711810014
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.339951940997537,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 774.0,
   "end_distance_m": 794.0,
   "start_elevation_m": 412.8465307322609,
   "end_elevation_m": 417.1145211204604,
   "min_gradient_pct": 2.447087135804793
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.63286539490491,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 602.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 390.0548115825884,
   "end_elevation_m": 395.2130279313146,
   "min_gradient_pct": 2.686479562012437
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.24940463830842,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 579.0,
   "end_distance_m": 629.0,
   "start_elevation_m": 385.9307003177207,
   "end_elevation_m": 395.55540263687493,
   "min_gradient_pct": 3.497178647743681
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.565886101365322,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 530.0,
   "end_distance_m": 630.0,
   "start_elevation_m": 379.11062491655207,
   "end_elevation_m": 395.6765110179174,
   "min_gradient_pct": 4.4354070551434575
  }
 ],
 "shape": {
  "ascent_concentration": 0.329,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 217.0,
  "shape_class": "sustained"
 },
 "length_m": 1035.8971417762755,
 "start_elevation_m": 321.12774459717434,
 "end_elevation_m": 441.3647934707109,
 "endpoint_gain_m": 120.23704887353654,
 "overall_gradient_pct": 11.607045142277682,
 "accumulated_ascent_m": 120.27126000196648,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.032873482466584,
   "start_distance_m": 779.0,
   "end_distance_m": 784.0,
   "midpoint_distance_m": 781.5,
   "start_elevation_m": 413.8601827951304,
   "end_elevation_m": 415.11182646925374,
   "start_xy": [
    944298.8572460179,
    6501035.182081786
   ],
   "end_xy": [
    944302.1298330327,
    6501038.962316466
   ]
  },
  "max_10m": {
   "gradient_pct": 22.652957369928686,
   "start_distance_m": 774.0,
   "end_distance_m": 784.0,
   "midpoint_distance_m": 779.0,
   "start_elevation_m": 412.8465307322609,
   "end_elevation_m": 415.11182646925374,
   "start_xy": [
    944295.5846590032,
    6501031.401847107
   ],
   "end_xy": [
    944302.1298330327,
    6501038.962316466
   ]
  },
  "max_20m": {
   "gradient_pct": 21.339951940997537,
   "start_distance_m": 774.0,
   "end_distance_m": 794.0,
   "midpoint_distance_m": 784.0,
   "start_elevation_m": 412.8465307322609,
   "end_elevation_m": 417.1145211204604,
   "start_xy": [
    944295.5846590032,
    6501031.401847107
   ],
   "end_xy": [
    944308.6750070624,
    6501046.522785824
   ]
  },
  "max_25m": {
   "gradient_pct": 20.63286539490491,
   "start_distance_m": 602.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 614.5,
   "start_elevation_m": 390.0548115825884,
   "end_elevation_m": 395.2130279313146,
   "start_xy": [
    944211.6469797496,
    6500887.600646417
   ],
   "end_xy": [
    944211.9832058611,
    6500912.5983853545
   ]
  },
  "max_50m": {
   "gradient_pct": 19.24940463830842,
   "start_distance_m": 579.0,
   "end_distance_m": 629.0,
   "midpoint_distance_m": 604.0,
   "start_elevation_m": 385.9307003177207,
   "end_elevation_m": 395.55540263687493,
   "start_xy": [
    944204.934284858,
    6500866.27849167
   ],
   "end_xy": [
    944212.0101039499,
    6500914.59820447
   ]
  },
  "max_100m": {
   "gradient_pct": 16.565886101365322,
   "start_distance_m": 530.0,
   "end_distance_m": 630.0,
   "midpoint_distance_m": 580.0,
   "start_elevation_m": 379.11062491655207,
   "end_elevation_m": 395.6765110179174,
   "start_xy": [
    944181.583136945,
    6500823.2019045735
   ],
   "end_xy": [
    944212.0484772356,
    6500915.589273511
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 1.3622254088829777,
   "start_distance_m": 182.0,
   "end_distance_m": 187.0,
   "midpoint_distance_m": 184.5,
   "start_elevation_m": 336.00326816240243,
   "end_elevation_m": 336.0713794328466,
   "start_xy": [
    944009.4359718988,
    6500552.65165141
   ],
   "end_xy": [
    944013.4095516647,
    6500555.176355874
   ]
  },
  "min_10m": {
   "gradient_pct": 2.1955462711810014,
   "start_distance_m": 153.0,
   "end_distance_m": 163.0,
   "midpoint_distance_m": 158.0,
   "start_elevation_m": 334.8190930660572,
   "end_elevation_m": 335.0386476931753,
   "start_xy": [
    944007.39686318,
    6500526.433480133
   ],
   "end_xy": [
    944013.209227497,
    6500534.030090192
   ]
  },
  "min_20m": {
   "gradient_pct": 2.447087135804793,
   "start_distance_m": 144.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 154.0,
   "start_elevation_m": 334.5879882968677,
   "end_elevation_m": 335.07740572402867,
   "start_xy": [
    944001.2564779934,
    6500519.853535623
   ],
   "end_xy": [
    944013.010635097,
    6500535.0101723615
   ]
  },
  "min_25m": {
   "gradient_pct": 2.686479562012437,
   "start_distance_m": 139.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 151.5,
   "start_elevation_m": 334.40578583352556,
   "end_elevation_m": 335.07740572402867,
   "start_xy": [
    943997.8451528897,
    6500516.198010895
   ],
   "end_xy": [
    944013.010635097,
    6500535.0101723615
   ]
  },
  "min_50m": {
   "gradient_pct": 3.497178647743681,
   "start_distance_m": 140.0,
   "end_distance_m": 190.0,
   "midpoint_distance_m": 165.0,
   "start_elevation_m": 334.4521283657529,
   "end_elevation_m": 336.20071768962475,
   "start_xy": [
    943998.5274179105,
    6500516.92911584
   ],
   "end_xy": [
    944016.0725680828,
    6500556.55778396
   ]
  },
  "min_100m": {
   "gradient_pct": 4.4354070551434575,
   "start_distance_m": 132.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 182.0,
   "start_elevation_m": 334.03222541328904,
   "end_elevation_m": 338.4676324684325,
   "start_xy": [
    943993.0692977445,
    6500511.080276276
   ],
   "end_xy": [
    944053.3553661637,
    6500575.8966816915
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.642538716853892,
   "start_distance_m": 792.0,
   "end_distance_m": 794.0,
   "midpoint_distance_m": 793.0,
   "start_elevation_m": 416.5816703461233,
   "end_elevation_m": 417.1145211204604,
   "start_xy": [
    944307.3659722564,
    6501045.010691952
   ],
   "end_xy": [
    944308.6750070624,
    6501046.522785824
   ]
  },
  "max_3m": {
   "gradient_pct": 25.748600564547058,
   "start_distance_m": 779.0,
   "end_distance_m": 782.0,
   "midpoint_distance_m": 780.5,
   "start_elevation_m": 413.8601827951304,
   "end_elevation_m": 414.6326408120668,
   "start_xy": [
    944298.8572460179,
    6501035.182081786
   ],
   "end_xy": [
    944300.8207982269,
    6501037.450222594
   ]
  }
 },
 "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": 0.147,
   "obstruction_max_height_m": 30.71,
   "flagged_windows_m": [
    3,
    5,
    10,
    20,
    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_E943-N6500_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E944-N6500_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E944-N6501_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:13:37+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": [
   "E943-N6500",
   "E944-N6500",
   "E944-N6501"
  ],
  "elevation_blocks": [
   "21LHD5QL2@2025-03-26"
  ],
  "ign_dalles": [
   "LHD_FXX_0943_6501_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0944_6501_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0944_6502_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD5QL2"
  ],
  "ign_editions": [
   "2025-03-26"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0943_6501_MNT_O_0M50_LAMB93_IGN69": "2025-03-26",
   "LHD_FXX_0944_6501_MNT_O_0M50_LAMB93_IGN69": "2025-03-26",
   "LHD_FXX_0944_6502_MNT_O_0M50_LAMB93_IGN69": "2025-03-26"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 5,
  "carriageway": {
   "stations": 48,
   "stations_resolved": 48,
   "width_median_m": 5.88,
   "width_p10_m": 3.75,
   "width_min_m": 1.75,
   "width_max_m": 11.5,
   "bounded_share": 0.312,
   "unbounded_share": 0.688,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.5,
   "window_m": [
    602.0,
    627.0
   ],
   "width_at_max25_m": 5.5,
   "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": 48,
    "stations_resolved": 48,
    "width_median_m": 5.88,
    "width_p10_m": 1.25,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.792,
    "unbounded_share": 0.208,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.88,
    "window_m": [
     602.0,
     627.0
    ],
    "width_at_max25_m": 6.5,
    "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": "Saint-Jean-de-la-Porte",
  "county": "Savoie",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}