{
 "ocl_version": "0.1.0",
 "name": "Chemin du Bac",
 "slug": "chemin-du-bac",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.85251706308543,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 468.0,
   "end_distance_m": 470.0,
   "start_elevation_m": 345.6896190989811,
   "end_elevation_m": 346.3466694402428,
   "min_gradient_pct": -16.881815607121098
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.444557001954838,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 467.0,
   "end_distance_m": 470.0,
   "start_elevation_m": 345.40333273018416,
   "end_elevation_m": 346.3466694402428,
   "min_gradient_pct": -8.196868839161198
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.13713518763575,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 465.0,
   "end_distance_m": 470.0,
   "start_elevation_m": 344.789812680861,
   "end_elevation_m": 346.3466694402428,
   "min_gradient_pct": -4.988940760300693
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.84536873678553,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 462.0,
   "end_distance_m": 472.0,
   "start_elevation_m": 344.0459247182382,
   "end_elevation_m": 346.73046159191676,
   "min_gradient_pct": -0.10335560369298946
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.708392819298524,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 454.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 342.61226161129076,
   "end_elevation_m": 347.15394017515047,
   "min_gradient_pct": 1.1940995141463873
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.68278388978888,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 477.0,
   "end_distance_m": 502.0,
   "start_elevation_m": 347.3011421890595,
   "end_elevation_m": 352.7218381615067,
   "min_gradient_pct": 1.210784390195613
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.967579063340395,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 453.0,
   "end_distance_m": 503.0,
   "start_elevation_m": 342.41929647199856,
   "end_elevation_m": 352.90308600366876,
   "min_gradient_pct": 2.376395125914314
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.89082702116218,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 437.0,
   "end_distance_m": 537.0,
   "start_elevation_m": 339.5834417497716,
   "end_elevation_m": 358.4742687709338,
   "min_gradient_pct": 3.105247675758733
  }
 ],
 "shape": {
  "ascent_concentration": 0.489,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 161.0,
  "shape_class": "stepped"
 },
 "length_m": 601.3999999998179,
 "start_elevation_m": 315.1233144216341,
 "end_elevation_m": 365.45825429387367,
 "endpoint_gain_m": 50.334939872239545,
 "overall_gradient_pct": 8.369627514508611,
 "accumulated_ascent_m": 52.244076647823135,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.13713518763575,
   "start_distance_m": 465.0,
   "end_distance_m": 470.0,
   "midpoint_distance_m": 467.5,
   "start_elevation_m": 344.789812680861,
   "end_elevation_m": 346.3466694402428,
   "start_xy": [
    676457.977741468,
    6207281.843658001
   ],
   "end_xy": [
    676460.828647801,
    6207277.73606344
   ]
  },
  "max_10m": {
   "gradient_pct": 26.84536873678553,
   "start_distance_m": 462.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 467.0,
   "start_elevation_m": 344.0459247182382,
   "end_elevation_m": 346.73046159191676,
   "start_xy": [
    676456.2775128786,
    6207284.315335657
   ],
   "end_xy": [
    676461.9690103341,
    6207276.093025615
   ]
  },
  "max_20m": {
   "gradient_pct": 22.708392819298524,
   "start_distance_m": 454.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 464.0,
   "start_elevation_m": 342.61226161129076,
   "end_elevation_m": 347.15394017515047,
   "start_xy": [
    676451.7492261518,
    6207290.910380716
   ],
   "end_xy": [
    676463.1093728673,
    6207274.449987791
   ]
  },
  "max_25m": {
   "gradient_pct": 21.68278388978888,
   "start_distance_m": 477.0,
   "end_distance_m": 502.0,
   "midpoint_distance_m": 489.5,
   "start_elevation_m": 347.3011421890595,
   "end_elevation_m": 352.7218381615067,
   "start_xy": [
    676464.8199166671,
    6207271.985431054
   ],
   "end_xy": [
    676479.0744483316,
    6207251.447458247
   ]
  },
  "max_50m": {
   "gradient_pct": 20.967579063340395,
   "start_distance_m": 453.0,
   "end_distance_m": 503.0,
   "midpoint_distance_m": 478.0,
   "start_elevation_m": 342.41929647199856,
   "end_elevation_m": 352.90308600366876,
   "start_xy": [
    676451.183190311,
    6207291.734761348
   ],
   "end_xy": [
    676479.6446295982,
    6207250.625939335
   ]
  },
  "max_100m": {
   "gradient_pct": 18.89082702116218,
   "start_distance_m": 437.0,
   "end_distance_m": 537.0,
   "midpoint_distance_m": 487.0,
   "start_elevation_m": 339.5834417497716,
   "end_elevation_m": 358.4742687709338,
   "start_xy": [
    676441.9126774548,
    6207304.769501461
   ],
   "end_xy": [
    676491.0206890553,
    6207223.782622902
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.988940760300693,
   "start_distance_m": 256.0,
   "end_distance_m": 261.0,
   "midpoint_distance_m": 258.5,
   "start_elevation_m": 327.70788619856637,
   "end_elevation_m": 327.45843916055134,
   "start_xy": [
    676347.7583253857,
    6207262.08127689
   ],
   "end_xy": [
    676349.5455794047,
    6207266.750936735
   ]
  },
  "min_10m": {
   "gradient_pct": -0.10335560369298946,
   "start_distance_m": 256.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 261.0,
   "start_elevation_m": 327.70788619856637,
   "end_elevation_m": 327.6975506381971,
   "start_xy": [
    676347.7583253857,
    6207262.08127689
   ],
   "end_xy": [
    676351.3328334237,
    6207271.420596581
   ]
  },
  "min_20m": {
   "gradient_pct": 1.1940995141463873,
   "start_distance_m": 256.0,
   "end_distance_m": 276.0,
   "midpoint_distance_m": 266.0,
   "start_elevation_m": 327.70788619856637,
   "end_elevation_m": 327.94670610139565,
   "start_xy": [
    676347.7583253857,
    6207262.08127689
   ],
   "end_xy": [
    676354.9202114724,
    6207280.754979605
   ]
  },
  "min_25m": {
   "gradient_pct": 1.210784390195613,
   "start_distance_m": 226.0,
   "end_distance_m": 251.0,
   "midpoint_distance_m": 238.5,
   "start_elevation_m": 326.63862386031906,
   "end_elevation_m": 326.94131995786796,
   "start_xy": [
    676336.1610897392,
    6207234.454857333
   ],
   "end_xy": [
    676345.9710713667,
    6207257.411617044
   ]
  },
  "min_50m": {
   "gradient_pct": 2.376395125914314,
   "start_distance_m": 233.0,
   "end_distance_m": 283.0,
   "midpoint_distance_m": 258.0,
   "start_elevation_m": 326.87127172112037,
   "end_elevation_m": 328.0594692840775,
   "start_xy": [
    676339.3753042325,
    6207240.6732835965
   ],
   "end_xy": [
    676357.431958846,
    6207287.288824196
   ]
  },
  "min_100m": {
   "gradient_pct": 3.105247675758733,
   "start_distance_m": 151.0,
   "end_distance_m": 251.0,
   "midpoint_distance_m": 201.0,
   "start_elevation_m": 323.8360722821092,
   "end_elevation_m": 326.94131995786796,
   "start_xy": [
    676288.5627232833,
    6207177.900259308
   ],
   "end_xy": [
    676345.9710713667,
    6207257.411617044
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.85251706308543,
   "start_distance_m": 468.0,
   "end_distance_m": 470.0,
   "midpoint_distance_m": 469.0,
   "start_elevation_m": 345.6896190989811,
   "end_elevation_m": 346.3466694402428,
   "start_xy": [
    676459.6882852678,
    6207279.379101264
   ],
   "end_xy": [
    676460.828647801,
    6207277.73606344
   ]
  },
  "max_3m": {
   "gradient_pct": 31.444557001954838,
   "start_distance_m": 467.0,
   "end_distance_m": 470.0,
   "midpoint_distance_m": 468.5,
   "start_elevation_m": 345.40333273018416,
   "end_elevation_m": 346.3466694402428,
   "start_xy": [
    676459.1181040012,
    6207280.200620176
   ],
   "end_xy": [
    676460.828647801,
    6207277.73606344
   ]
  }
 },
 "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": 0.512,
   "obstruction_max_height_m": 18.89,
   "flagged_windows_m": [
    5,
    10,
    20,
    50
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "937d2a005af5491e462567d7f33ab563f033918b",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:0048c2bbb24ab95e",
   "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-pyr4",
   "road_pbf": "block-batch-fr-pyr4.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:c54ac68b3f57b41b"
  },
  "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_E676-N6207_0m5@21LHD3KR-2025-03-18.tif"
  ],
  "calculated_at": "2026-09-20T09:08:19+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-pyr4.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-pyr4",
  "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": [
   "E676-N6207"
  ],
  "elevation_blocks": [
   "21LHD3KR@2025-03-18"
  ],
  "ign_dalles": [
   "LHD_FXX_0676_6208_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD3KR"
  ],
  "ign_editions": [
   "2025-03-18"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0676_6208_MNT_O_0M50_LAMB93_IGN69": "2025-03-18"
  },
  "route_cut_m": 601.4,
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 31,
   "stations_resolved": 31,
   "width_median_m": 5.75,
   "width_p10_m": 2.75,
   "width_min_m": 1.0,
   "width_max_m": 9.25,
   "bounded_share": 0.258,
   "unbounded_share": 0.742,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.0,
   "window_m": [
    477.0,
    502.0
   ],
   "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": 31,
    "stations_resolved": 31,
    "width_median_m": 3.25,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 9.0,
    "bounded_share": 0.935,
    "unbounded_share": 0.065,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.0,
    "window_m": [
     477.0,
     502.0
    ],
    "width_at_max25_m": 3.25,
    "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": "Quintillan",
  "county": "Aude",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}