{
 "ocl_version": "0.1.0",
 "name": "Chemin du Segala",
 "slug": "chemin-du-segala",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.219670783709034,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 435.0,
   "end_distance_m": 437.0,
   "start_elevation_m": 381.6634261043522,
   "end_elevation_m": 382.1278195200264,
   "min_gradient_pct": -0.8451848748194379
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.90413985514685,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 434.0,
   "end_distance_m": 437.0,
   "start_elevation_m": 381.440695324372,
   "end_elevation_m": 382.1278195200264,
   "min_gradient_pct": 0.08499250145632686
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.55565731553702,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 433.0,
   "end_distance_m": 438.0,
   "start_elevation_m": 381.217752491399,
   "end_elevation_m": 382.34553535717583,
   "min_gradient_pct": 0.5650518896027279
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.834216754970726,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 430.0,
   "end_distance_m": 440.0,
   "start_elevation_m": 380.57453551165094,
   "end_elevation_m": 382.757957187148,
   "min_gradient_pct": 0.8056846246489613
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.45830216309355,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 427.0,
   "end_distance_m": 447.0,
   "start_elevation_m": 380.0042200793101,
   "end_elevation_m": 384.0958805119288,
   "min_gradient_pct": 1.8672644591896415
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.034830190663342,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 429.0,
   "end_distance_m": 454.0,
   "start_elevation_m": 380.3736733765637,
   "end_elevation_m": 385.38238092422955,
   "min_gradient_pct": 1.8491145024581783
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.007814301341455,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 406.0,
   "end_distance_m": 456.0,
   "start_elevation_m": 376.6790967590789,
   "end_elevation_m": 385.68300390974963,
   "min_gradient_pct": 2.4223626364229176
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.313496792021112,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 384.0,
   "end_distance_m": 484.0,
   "start_elevation_m": 373.4103311281791,
   "end_elevation_m": 389.7238279202002,
   "min_gradient_pct": 5.573524613285258
  }
 ],
 "shape": {
  "ascent_concentration": 0.391,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 130.0,
  "shape_class": "sustained"
 },
 "length_m": 484.95647910696334,
 "start_elevation_m": 340.98743970656204,
 "end_elevation_m": 389.84012252446405,
 "endpoint_gain_m": 48.85268281790201,
 "overall_gradient_pct": 10.073622051171096,
 "accumulated_ascent_m": 48.92956332988388,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.55565731553702,
   "start_distance_m": 433.0,
   "end_distance_m": 438.0,
   "midpoint_distance_m": 435.5,
   "start_elevation_m": 381.217752491399,
   "end_elevation_m": 382.34553535717583,
   "start_xy": [
    682301.4841659904,
    6380445.0670016
   ],
   "end_xy": [
    682306.2188628978,
    6380446.668626984
   ]
  },
  "max_10m": {
   "gradient_pct": 21.834216754970726,
   "start_distance_m": 430.0,
   "end_distance_m": 440.0,
   "midpoint_distance_m": 435.0,
   "start_elevation_m": 380.57453551165094,
   "end_elevation_m": 382.757957187148,
   "start_xy": [
    682298.6350151921,
    6380444.127672196
   ],
   "end_xy": [
    682308.0479062933,
    6380447.477700687
   ]
  },
  "max_20m": {
   "gradient_pct": 20.45830216309355,
   "start_distance_m": 427.0,
   "end_distance_m": 447.0,
   "midpoint_distance_m": 437.0,
   "start_elevation_m": 380.0042200793101,
   "end_elevation_m": 384.0958805119288,
   "start_xy": [
    682295.6980172116,
    6380443.631350935
   ],
   "end_xy": [
    682314.3922415543,
    6380450.408404562
   ]
  },
  "max_25m": {
   "gradient_pct": 20.034830190663342,
   "start_distance_m": 429.0,
   "end_distance_m": 454.0,
   "midpoint_distance_m": 441.5,
   "start_elevation_m": 380.3736733765637,
   "end_elevation_m": 385.38238092422955,
   "start_xy": [
    682297.6852982594,
    6380443.814562394
   ],
   "end_xy": [
    682320.0335269457,
    6380454.552786196
   ]
  },
  "max_50m": {
   "gradient_pct": 18.007814301341455,
   "start_distance_m": 406.0,
   "end_distance_m": 456.0,
   "midpoint_distance_m": 431.0,
   "start_elevation_m": 376.6790967590789,
   "end_elevation_m": 385.68300390974963,
   "start_xy": [
    682276.9022488265,
    6380451.778620828
   ],
   "end_xy": [
    682321.6453227719,
    6380455.736895234
   ]
  },
  "max_100m": {
   "gradient_pct": 16.313496792021112,
   "start_distance_m": 384.0,
   "end_distance_m": 484.0,
   "midpoint_distance_m": 434.0,
   "start_elevation_m": 373.4103311281791,
   "end_elevation_m": 389.7238279202002,
   "start_xy": [
    682257.9040778411,
    6380462.727215979
   ],
   "end_xy": [
    682342.975883166,
    6380473.773594739
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 0.5650518896027279,
   "start_distance_m": 332.0,
   "end_distance_m": 337.0,
   "midpoint_distance_m": 334.5,
   "start_elevation_m": 369.0233262771644,
   "end_elevation_m": 369.05157887164455,
   "start_xy": [
    682210.831297737,
    6380484.694172208
   ],
   "end_xy": [
    682215.269930999,
    6380482.392317572
   ]
  },
  "min_10m": {
   "gradient_pct": 0.8056846246489613,
   "start_distance_m": 329.0,
   "end_distance_m": 339.0,
   "midpoint_distance_m": 334.0,
   "start_elevation_m": 368.9981735441257,
   "end_elevation_m": 369.0787420065906,
   "start_xy": [
    682208.1681177798,
    6380486.07528499
   ],
   "end_xy": [
    682217.0453843038,
    6380481.471575717
   ]
  },
  "min_20m": {
   "gradient_pct": 1.8672644591896415,
   "start_distance_m": 321.0,
   "end_distance_m": 341.0,
   "midpoint_distance_m": 331.0,
   "start_elevation_m": 368.75963343018543,
   "end_elevation_m": 369.13308632202336,
   "start_xy": [
    682200.915105974,
    6380489.435194793
   ],
   "end_xy": [
    682218.8208376085,
    6380480.550833863
   ]
  },
  "min_25m": {
   "gradient_pct": 1.8491145024581783,
   "start_distance_m": 315.0,
   "end_distance_m": 340.0,
   "midpoint_distance_m": 327.5,
   "start_elevation_m": 368.6384934916083,
   "end_elevation_m": 369.10077211722285,
   "start_xy": [
    682195.3819147592,
    6380491.755495416
   ],
   "end_xy": [
    682217.9331109562,
    6380481.01120479
   ]
  },
  "min_50m": {
   "gradient_pct": 2.4223626364229176,
   "start_distance_m": 299.0,
   "end_distance_m": 349.0,
   "midpoint_distance_m": 324.0,
   "start_elevation_m": 368.2347015091895,
   "end_elevation_m": 369.44588282740096,
   "start_xy": [
    682179.6065908585,
    6380494.303766609
   ],
   "end_xy": [
    682225.9226508278,
    6380476.867866445
   ]
  },
  "min_100m": {
   "gradient_pct": 5.573524613285258,
   "start_distance_m": 257.0,
   "end_distance_m": 357.0,
   "midpoint_distance_m": 307.0,
   "start_elevation_m": 364.3171894359439,
   "end_elevation_m": 369.89071404922913,
   "start_xy": [
    682137.945598554,
    6380496.027354956
   ],
   "end_xy": [
    682233.0729425434,
    6380473.282956505
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.219670783709034,
   "start_distance_m": 435.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 436.0,
   "start_elevation_m": 381.6634261043522,
   "end_elevation_m": 382.1278195200264,
   "start_xy": [
    682303.3835998558,
    6380445.693221202
   ],
   "end_xy": [
    682305.2830337214,
    6380446.319440804
   ]
  },
  "max_3m": {
   "gradient_pct": 22.90413985514685,
   "start_distance_m": 434.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 435.5,
   "start_elevation_m": 381.440695324372,
   "end_elevation_m": 382.1278195200264,
   "start_xy": [
    682302.4338829231,
    6380445.380111401
   ],
   "end_xy": [
    682305.2830337214,
    6380446.319440804
   ]
  }
 },
 "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": 0.218,
   "obstruction_max_height_m": 20.76,
   "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",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "1cc9fdcd6556a02163cb21acb2293cad3067d2a1",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "fr-mc4",
   "road_pbf": "block-batch-fr-mc4.osm.pbf",
   "region_key": "france",
   "crs": "EPSG:2154",
   "elevation_provider_key": "ign-lidarhd",
   "tile_index": "wms-grid",
   "authority": "bdtopo",
   "registry_pbf": "france-vosges-2026-09-16.osm.pbf",
   "tile_index_snapshot": "sha256:af4eae1f5df9e232"
  },
  "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_E681-N6380_0m5@22LHD2KO-2025-02-06.tif",
   "data/cache/fr/ign-lidarhd_dtm_E682-N6380_0m5@22LHD2KO-2025-02-06.tif"
  ],
  "calculated_at": "2026-09-22T17:25:47+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-mc4.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-mc4",
  "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": [
   "E681-N6380",
   "E682-N6380"
  ],
  "elevation_blocks": [
   "22LHD2KO@2025-02-06"
  ],
  "ign_dalles": [
   "LHD_FXX_0681_6381_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0682_6381_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD2KO"
  ],
  "ign_editions": [
   "2025-02-06"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0681_6381_MNT_O_0M50_LAMB93_IGN69": "2025-02-06",
   "LHD_FXX_0682_6381_MNT_O_0M50_LAMB93_IGN69": "2025-02-06"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 26,
   "stations_resolved": 26,
   "width_median_m": 5.88,
   "width_p10_m": 4.38,
   "width_min_m": 3.75,
   "width_max_m": 12.0,
   "bounded_share": 0.308,
   "unbounded_share": 0.692,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.0,
   "window_m": [
    429.0,
    454.0
   ],
   "width_at_max25_m": 5.75,
   "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": 26,
    "stations_resolved": 26,
    "width_median_m": 3.75,
    "width_p10_m": 1.38,
    "width_min_m": 1.0,
    "width_max_m": 12.0,
    "bounded_share": 0.923,
    "unbounded_share": 0.077,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.5,
    "window_m": [
     429.0,
     454.0
    ],
    "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": "Espalion",
  "county": "Aveyron",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}