{
 "ocl_version": "0.1.0",
 "name": "Chemin de Chantua",
 "slug": "chemin-de-chantua",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.325183459605796,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1976.0,
   "end_distance_m": 1978.0,
   "start_elevation_m": 552.8260798907512,
   "end_elevation_m": 553.3925835599433,
   "min_gradient_pct": -4.5073144155992395
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.186674904492218,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1975.0,
   "end_distance_m": 1978.0,
   "start_elevation_m": 552.6069833128086,
   "end_elevation_m": 553.3925835599433,
   "min_gradient_pct": -4.003051244419946
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.204167167326887,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1973.0,
   "end_distance_m": 1978.0,
   "start_elevation_m": 552.182375201577,
   "end_elevation_m": 553.3925835599433,
   "min_gradient_pct": -3.0562870840549294
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.572196583039158,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1968.0,
   "end_distance_m": 1978.0,
   "start_elevation_m": 551.2353639016394,
   "end_elevation_m": 553.3925835599433,
   "min_gradient_pct": -2.5486731991986744
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.985340700556776,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1983.0,
   "end_distance_m": 2003.0,
   "start_elevation_m": 554.1939694875639,
   "end_elevation_m": 558.3910376276752,
   "min_gradient_pct": -2.190926344244417
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.777248876862814,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1972.0,
   "end_distance_m": 1997.0,
   "start_elevation_m": 551.9522176894889,
   "end_elevation_m": 557.1465299087046,
   "min_gradient_pct": -2.062921970597017
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.155514101345034,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1965.0,
   "end_distance_m": 2015.0,
   "start_elevation_m": 550.6125228404285,
   "end_elevation_m": 560.690279891101,
   "min_gradient_pct": -1.1203813572942636
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.748991874505464,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1953.0,
   "end_distance_m": 2053.0,
   "start_elevation_m": 548.4956923216307,
   "end_elevation_m": 567.2446841961362,
   "min_gradient_pct": 1.2716008297221606
  }
 ],
 "shape": {
  "ascent_concentration": 0.373,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 472.0,
  "shape_class": "sustained"
 },
 "length_m": 2240.6737250430933,
 "start_elevation_m": 366.2848287652599,
 "end_elevation_m": 581.792719160155,
 "endpoint_gain_m": 215.50789039489513,
 "overall_gradient_pct": 9.617995158610182,
 "accumulated_ascent_m": 216.75268703187413,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.204167167326887,
   "start_distance_m": 1973.0,
   "end_distance_m": 1978.0,
   "midpoint_distance_m": 1975.5,
   "start_elevation_m": 552.182375201577,
   "end_elevation_m": 553.3925835599433,
   "start_xy": [
    712187.123958528,
    6508838.259098806
   ],
   "end_xy": [
    712190.0061793771,
    6508842.344781489
   ]
  },
  "max_10m": {
   "gradient_pct": 21.572196583039158,
   "start_distance_m": 1968.0,
   "end_distance_m": 1978.0,
   "midpoint_distance_m": 1973.0,
   "start_elevation_m": 551.2353639016394,
   "end_elevation_m": 553.3925835599433,
   "start_xy": [
    712184.241737679,
    6508834.173416125
   ],
   "end_xy": [
    712190.0061793771,
    6508842.344781489
   ]
  },
  "max_20m": {
   "gradient_pct": 20.985340700556776,
   "start_distance_m": 1983.0,
   "end_distance_m": 2003.0,
   "midpoint_distance_m": 1993.0,
   "start_elevation_m": 554.1939694875639,
   "end_elevation_m": 558.3910376276752,
   "start_xy": [
    712192.8884002261,
    6508846.430464171
   ],
   "end_xy": [
    712199.010637768,
    6508865.016528199
   ]
  },
  "max_25m": {
   "gradient_pct": 20.777248876862814,
   "start_distance_m": 1972.0,
   "end_distance_m": 1997.0,
   "midpoint_distance_m": 1984.5,
   "start_elevation_m": 551.9522176894889,
   "end_elevation_m": 557.1465299087046,
   "start_xy": [
    712186.5475143583,
    6508837.44196227
   ],
   "end_xy": [
    712198.7896942588,
    6508859.020597583
   ]
  },
  "max_50m": {
   "gradient_pct": 20.155514101345034,
   "start_distance_m": 1965.0,
   "end_distance_m": 2015.0,
   "midpoint_distance_m": 1990.0,
   "start_elevation_m": 550.6125228404285,
   "end_elevation_m": 560.690279891101,
   "start_xy": [
    712182.5124051695,
    6508831.722006516
   ],
   "end_xy": [
    712198.6692793675,
    6508876.997517938
   ]
  },
  "max_100m": {
   "gradient_pct": 18.748991874505464,
   "start_distance_m": 1953.0,
   "end_distance_m": 2053.0,
   "midpoint_distance_m": 2003.0,
   "start_elevation_m": 548.4956923216307,
   "end_elevation_m": 567.2446841961362,
   "start_xy": [
    712175.5965687268,
    6508821.915314709
   ],
   "end_xy": [
    712196.5045308815,
    6508914.934765212
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.0562870840549294,
   "start_distance_m": 2223.0,
   "end_distance_m": 2228.0,
   "midpoint_distance_m": 2225.5,
   "start_elevation_m": 582.0072707653294,
   "end_elevation_m": 581.8544564111266,
   "start_xy": [
    712313.7853428677,
    6508907.707243414
   ],
   "end_xy": [
    712317.3105414071,
    6508904.161404267
   ]
  },
  "min_10m": {
   "gradient_pct": -2.5486731991986744,
   "start_distance_m": 2222.0,
   "end_distance_m": 2232.0,
   "midpoint_distance_m": 2227.0,
   "start_elevation_m": 582.0267523998655,
   "end_elevation_m": 581.7718850799456,
   "start_xy": [
    712313.0803031599,
    6508908.416411243
   ],
   "end_xy": [
    712318.5456624317,
    6508900.589728283
   ]
  },
  "min_20m": {
   "gradient_pct": -2.190926344244417,
   "start_distance_m": 2209.0,
   "end_distance_m": 2229.0,
   "midpoint_distance_m": 2219.0,
   "start_elevation_m": 582.2698609701433,
   "end_elevation_m": 581.8316757012944,
   "start_xy": [
    712302.458716945,
    6508915.838700771
   ],
   "end_xy": [
    712318.015581115,
    6508903.452236437
   ]
  },
  "min_25m": {
   "gradient_pct": -2.062921970597017,
   "start_distance_m": 2208.0,
   "end_distance_m": 2233.0,
   "midpoint_distance_m": 2220.5,
   "start_elevation_m": 582.2833823238295,
   "end_elevation_m": 581.7676518311803,
   "start_xy": [
    712301.5859278197,
    6508916.326798243
   ],
   "end_xy": [
    712318.6314776455,
    6508899.593417211
   ]
  },
  "min_50m": {
   "gradient_pct": -1.1203813572942636,
   "start_distance_m": 2190.0,
   "end_distance_m": 2240.0,
   "midpoint_distance_m": 2215.0,
   "start_elevation_m": 582.3441763547968,
   "end_elevation_m": 581.7839856761497,
   "start_xy": [
    712285.3654044681,
    6508924.095248292
   ],
   "end_xy": [
    712319.2321841415,
    6508892.619239719
   ]
  },
  "min_100m": {
   "gradient_pct": 1.2716008297221606,
   "start_distance_m": 2140.0,
   "end_distance_m": 2240.0,
   "midpoint_distance_m": 2190.0,
   "start_elevation_m": 580.5123848464275,
   "end_elevation_m": 581.7839856761497,
   "start_xy": [
    712242.089122184,
    6508948.700753637
   ],
   "end_xy": [
    712319.2321841415,
    6508892.619239719
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.325183459605796,
   "start_distance_m": 1976.0,
   "end_distance_m": 1978.0,
   "midpoint_distance_m": 1977.0,
   "start_elevation_m": 552.8260798907512,
   "end_elevation_m": 553.3925835599433,
   "start_xy": [
    712188.8532910375,
    6508840.710508416
   ],
   "end_xy": [
    712190.0061793771,
    6508842.344781489
   ]
  },
  "max_3m": {
   "gradient_pct": 26.186674904492218,
   "start_distance_m": 1975.0,
   "end_distance_m": 1978.0,
   "midpoint_distance_m": 1976.5,
   "start_elevation_m": 552.6069833128086,
   "end_elevation_m": 553.3925835599433,
   "start_xy": [
    712188.2768468676,
    6508839.89337188
   ],
   "end_xy": [
    712190.0061793771,
    6508842.344781489
   ]
  }
 },
 "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": 0.057,
   "obstruction_max_height_m": 13.66,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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-mc5",
   "road_pbf": "block-batch-fr-mc5.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_E711-N6508_0m5@22LHD4LL-2025-07-24.tif",
   "data/cache/fr/ign-lidarhd_dtm_E712-N6507_0m5@22LHD4LL-2025-07-24.tif",
   "data/cache/fr/ign-lidarhd_dtm_E712-N6508_0m5@22LHD4LL-2025-07-24.tif"
  ],
  "calculated_at": "2026-09-22T16:38:15+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-mc5.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-mc5",
  "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": [
   "E711-N6508",
   "E712-N6507",
   "E712-N6508"
  ],
  "elevation_blocks": [
   "22LHD4LL@2025-07-24"
  ],
  "ign_dalles": [
   "LHD_FXX_0711_6509_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0712_6508_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0712_6509_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD4LL"
  ],
  "ign_editions": [
   "2025-07-24"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0711_6509_MNT_O_0M50_LAMB93_IGN69": "2025-07-24",
   "LHD_FXX_0712_6508_MNT_O_0M50_LAMB93_IGN69": "2025-07-24",
   "LHD_FXX_0712_6509_MNT_O_0M50_LAMB93_IGN69": "2025-07-24"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 9,
  "carriageway": {
   "stations": 96,
   "stations_resolved": 96,
   "width_median_m": 7.38,
   "width_p10_m": 4.62,
   "width_min_m": 3.75,
   "width_max_m": 11.5,
   "bounded_share": 0.219,
   "unbounded_share": 0.781,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.0,
   "window_m": [
    1972.0,
    1997.0
   ],
   "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": 96,
    "stations_resolved": 96,
    "width_median_m": 6.75,
    "width_p10_m": 2.5,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.719,
    "unbounded_share": 0.281,
    "confidence_median": 1.0,
    "width_median_bounded_m": 5.75,
    "window_m": [
     1972.0,
     1997.0
    ],
    "width_at_max25_m": 3.0,
    "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": "Veyre-Monton",
  "county": "Puy-de-D\u00f4me",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}