{
 "ocl_version": "0.1.0",
 "name": "Impasse de Pied Fort",
 "slug": "impasse-de-pied-fort",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.186338704903164,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 525.6144644825839,
   "end_elevation_m": 526.078191256682,
   "min_gradient_pct": -12.428513327887458
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.505346578797496,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 522.6418694613131,
   "end_elevation_m": 523.3170298586771,
   "min_gradient_pct": -6.196982176353079
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.881329265161185,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 106.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 524.9841247934239,
   "end_elevation_m": 526.078191256682,
   "min_gradient_pct": -3.6489819607231766
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.53370627799177,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 94.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 522.4315025393892,
   "end_elevation_m": 524.5848731671883,
   "min_gradient_pct": -2.4158352367567204
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.252354334149572,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 521.8277203898521,
   "end_elevation_m": 526.078191256682,
   "min_gradient_pct": 0.28895572349711074
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.87270074207072,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 91.0,
   "end_distance_m": 116.0,
   "start_elevation_m": 521.8277203898521,
   "end_elevation_m": 527.0458955753697,
   "min_gradient_pct": 0.8652923675531383
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.541291600769,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 66.0,
   "end_distance_m": 116.0,
   "start_elevation_m": 517.2752497749852,
   "end_elevation_m": 527.0458955753697,
   "min_gradient_pct": 5.301400458653234
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.43389740872277,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 28.0,
   "end_distance_m": 128.0,
   "start_elevation_m": 510.3590350896928,
   "end_elevation_m": 528.7929324984156,
   "min_gradient_pct": 8.511968492127494
  }
 ],
 "shape": {
  "ascent_concentration": 0.347,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 171.0,
  "shape_class": "sustained"
 },
 "length_m": 428.718863940389,
 "start_elevation_m": 506.13398458250225,
 "end_elevation_m": 562.16225637221,
 "endpoint_gain_m": 56.02827178970773,
 "overall_gradient_pct": 13.068767554277285,
 "accumulated_ascent_m": 56.489357341114385,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.881329265161185,
   "start_distance_m": 106.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 108.5,
   "start_elevation_m": 524.9841247934239,
   "end_elevation_m": 526.078191256682,
   "start_xy": [
    879718.5797591209,
    6433532.004315369
   ],
   "end_xy": [
    879722.5026528962,
    6433535.104461241
   ]
  },
  "max_10m": {
   "gradient_pct": 21.53370627799177,
   "start_distance_m": 94.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 99.0,
   "start_elevation_m": 522.4315025393892,
   "end_elevation_m": 524.5848731671883,
   "start_xy": [
    879709.1648140604,
    6433524.563965276
   ],
   "end_xy": [
    879717.0106016109,
    6433530.764257019
   ]
  },
  "max_20m": {
   "gradient_pct": 21.252354334149572,
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 101.0,
   "start_elevation_m": 521.8277203898521,
   "end_elevation_m": 526.078191256682,
   "start_xy": [
    879706.7914791467,
    6433522.730043985
   ],
   "end_xy": [
    879722.5026528962,
    6433535.104461241
   ]
  },
  "max_25m": {
   "gradient_pct": 20.87270074207072,
   "start_distance_m": 91.0,
   "end_distance_m": 116.0,
   "midpoint_distance_m": 103.5,
   "start_elevation_m": 521.8277203898521,
   "end_elevation_m": 527.0458955753697,
   "start_xy": [
    879706.7914791467,
    6433522.730043985
   ],
   "end_xy": [
    879726.4295253602,
    6433538.199497251
   ]
  },
  "max_50m": {
   "gradient_pct": 19.541291600769,
   "start_distance_m": 66.0,
   "end_distance_m": 116.0,
   "midpoint_distance_m": 91.0,
   "start_elevation_m": 517.2752497749852,
   "end_elevation_m": 527.0458955753697,
   "start_xy": [
    879686.2414965831,
    6433508.49973626
   ],
   "end_xy": [
    879726.4295253602,
    6433538.199497251
   ]
  },
  "max_100m": {
   "gradient_pct": 18.43389740872277,
   "start_distance_m": 28.0,
   "end_distance_m": 128.0,
   "midpoint_distance_m": 78.0,
   "start_elevation_m": 510.3590350896928,
   "end_elevation_m": 528.7929324984156,
   "start_xy": [
    879656.9013994588,
    6433484.444171207
   ],
   "end_xy": [
    879735.8525328925,
    6433545.617073253
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.6489819607231766,
   "start_distance_m": 372.0,
   "end_distance_m": 377.0,
   "midpoint_distance_m": 374.5,
   "start_elevation_m": 557.5839916206921,
   "end_elevation_m": 557.401542522656,
   "start_xy": [
    879744.5596593295,
    6433777.535718766
   ],
   "end_xy": [
    879742.1110631453,
    6433781.894749402
   ]
  },
  "min_10m": {
   "gradient_pct": -2.4158352367567204,
   "start_distance_m": 367.0,
   "end_distance_m": 377.0,
   "midpoint_distance_m": 372.0,
   "start_elevation_m": 557.6431260463316,
   "end_elevation_m": 557.401542522656,
   "start_xy": [
    879746.757016884,
    6433773.053082153
   ],
   "end_xy": [
    879742.1110631453,
    6433781.894749402
   ]
  },
  "min_20m": {
   "gradient_pct": 0.28895572349711074,
   "start_distance_m": 367.0,
   "end_distance_m": 387.0,
   "midpoint_distance_m": 377.0,
   "start_elevation_m": 557.6431260463316,
   "end_elevation_m": 557.7009171910311,
   "start_xy": [
    879746.757016884,
    6433773.053082153
   ],
   "end_xy": [
    879736.4111165814,
    6433790.097490643
   ]
  },
  "min_25m": {
   "gradient_pct": 0.8652923675531383,
   "start_distance_m": 364.0,
   "end_distance_m": 389.0,
   "midpoint_distance_m": 376.5,
   "start_elevation_m": 557.51327224713,
   "end_elevation_m": 557.7295953390183,
   "start_xy": [
    879747.9205779292,
    6433770.287919284
   ],
   "end_xy": [
    879735.1497797229,
    6433791.64959545
   ]
  },
  "min_50m": {
   "gradient_pct": 5.301400458653234,
   "start_distance_m": 348.0,
   "end_distance_m": 398.0,
   "midpoint_distance_m": 373.0,
   "start_elevation_m": 556.0820079514058,
   "end_elevation_m": 558.7327081807324,
   "start_xy": [
    879753.0024057304,
    6433755.118680114
   ],
   "end_xy": [
    879727.7121980252,
    6433796.494362078
   ]
  },
  "min_100m": {
   "gradient_pct": 8.511968492127494,
   "start_distance_m": 328.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 378.0,
   "start_elevation_m": 553.5285041206889,
   "end_elevation_m": 562.0404726128164,
   "start_xy": [
    879756.8358853525,
    6433735.772965145
   ],
   "end_xy": [
    879698.9489526775,
    6433791.745557992
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.186338704903164,
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 525.6144644825839,
   "end_elevation_m": 526.078191256682,
   "start_xy": [
    879720.933495386,
    6433533.864402892
   ],
   "end_xy": [
    879722.5026528962,
    6433535.104461241
   ]
  },
  "max_3m": {
   "gradient_pct": 22.505346578797496,
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 522.6418694613131,
   "end_elevation_m": 523.3170298586771,
   "start_xy": [
    879709.9493928155,
    6433525.18399445
   ],
   "end_xy": [
    879712.3031290806,
    6433527.044081973
   ]
  }
 },
 "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": 0.167,
   "obstruction_max_height_m": 14.61,
   "flagged_windows_m": [
    2,
    10,
    20,
    25
   ]
  },
  "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_E879-N6433_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:10:06+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": [
   "E879-N6433"
  ],
  "elevation_blocks": [
   "21LHD6OM@2024-10-24"
  ],
  "ign_dalles": [
   "LHD_FXX_0879_6434_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6OM"
  ],
  "ign_editions": [
   "2024-10-24"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0879_6434_MNT_O_0M50_LAMB93_IGN69": "2024-10-24"
  },
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 24,
   "stations_resolved": 24,
   "width_median_m": 4.25,
   "width_p10_m": 2.5,
   "width_min_m": 1.5,
   "width_max_m": 8.0,
   "bounded_share": 0.625,
   "unbounded_share": 0.375,
   "confidence_median": 0.885,
   "width_median_bounded_m": 4.5,
   "window_m": [
    91.0,
    116.0
   ],
   "width_at_max25_m": 4.5,
   "window_stations": 7,
   "single_track": true,
   "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": 24,
    "stations_resolved": 24,
    "width_median_m": 4.12,
    "width_p10_m": 1.0,
    "width_min_m": 0.75,
    "width_max_m": 10.0,
    "bounded_share": 0.958,
    "unbounded_share": 0.042,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.0,
    "window_m": [
     91.0,
     116.0
    ],
    "width_at_max25_m": 3.75,
    "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
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bouvante",
  "county": "Dr\u00f4me",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}