{
 "ocl_version": "0.1.0",
 "name": "Chemin des Chalets",
 "slug": "chemin-des-chalets-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.64066178120754,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 264.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 109.57002083301025,
   "end_elevation_m": 110.0828340686344,
   "min_gradient_pct": -8.169640604611317
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.894309013422838,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 331.0,
   "end_distance_m": 334.0,
   "start_elevation_m": 123.20004497361143,
   "end_elevation_m": 123.94687424401411,
   "min_gradient_pct": -8.12986653298348
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.058468344765913,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 330.0,
   "end_distance_m": 335.0,
   "start_elevation_m": 122.97935722069552,
   "end_elevation_m": 124.18228063793381,
   "min_gradient_pct": -8.018438285787681
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.684516696065714,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 331.0,
   "end_distance_m": 341.0,
   "start_elevation_m": 123.20004497361143,
   "end_elevation_m": 125.568496643218,
   "min_gradient_pct": -6.811838792460918
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.942940416824342,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 324.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 121.68644197169833,
   "end_elevation_m": 126.2750300550632,
   "min_gradient_pct": -5.215138765361047
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.435171718099127,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 319.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 120.66623712553842,
   "end_elevation_m": 126.2750300550632,
   "min_gradient_pct": -4.518918287085455
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.60117107971095,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 294.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 115.47444451520772,
   "end_elevation_m": 126.2750300550632,
   "min_gradient_pct": -3.2848631436166613
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.19355641277086,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 244.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 106.08147364229234,
   "end_elevation_m": 126.2750300550632,
   "min_gradient_pct": -2.3647145207289384
  }
 ],
 "shape": {
  "ascent_concentration": 0.46,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 186.0,
  "shape_class": "stepped"
 },
 "length_m": 344.1863769717769,
 "start_elevation_m": 90.73934285437677,
 "end_elevation_m": 126.32114012967797,
 "endpoint_gain_m": 35.5817972753012,
 "overall_gradient_pct": 10.337944688095218,
 "accumulated_ascent_m": 38.465077548680185,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.058468344765913,
   "start_distance_m": 330.0,
   "end_distance_m": 335.0,
   "midpoint_distance_m": 332.5,
   "start_elevation_m": 122.97935722069552,
   "end_elevation_m": 124.18228063793381,
   "start_xy": [
    897321.8267752929,
    6242346.231994106
   ],
   "end_xy": [
    897321.8635093749,
    6242341.232129048
   ]
  },
  "max_10m": {
   "gradient_pct": 23.684516696065714,
   "start_distance_m": 331.0,
   "end_distance_m": 341.0,
   "midpoint_distance_m": 336.0,
   "start_elevation_m": 123.20004497361143,
   "end_elevation_m": 125.568496643218,
   "start_xy": [
    897321.8341221092,
    6242345.232021095
   ],
   "end_xy": [
    897321.9075902733,
    6242335.232290978
   ]
  },
  "max_20m": {
   "gradient_pct": 22.942940416824342,
   "start_distance_m": 324.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 334.0,
   "start_elevation_m": 121.68644197169833,
   "end_elevation_m": 126.2750300550632,
   "start_xy": [
    897321.7826943944,
    6242352.231832177
   ],
   "end_xy": [
    897321.9296307226,
    6242332.232371942
   ]
  },
  "max_25m": {
   "gradient_pct": 22.435171718099127,
   "start_distance_m": 319.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 331.5,
   "start_elevation_m": 120.66623712553842,
   "end_elevation_m": 126.2750300550632,
   "start_xy": [
    897321.7459603123,
    6242357.231697236
   ],
   "end_xy": [
    897321.9296307226,
    6242332.232371942
   ]
  },
  "max_50m": {
   "gradient_pct": 21.60117107971095,
   "start_distance_m": 294.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 319.0,
   "start_elevation_m": 115.47444451520772,
   "end_elevation_m": 126.2750300550632,
   "start_xy": [
    897319.1184202334,
    6242382.032034129
   ],
   "end_xy": [
    897321.9296307226,
    6242332.232371942
   ]
  },
  "max_100m": {
   "gradient_pct": 20.19355641277086,
   "start_distance_m": 244.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 294.0,
   "start_elevation_m": 106.08147364229234,
   "end_elevation_m": 126.2750300550632,
   "start_xy": [
    897294.7482685675,
    6242424.578849949
   ],
   "end_xy": [
    897321.9296307226,
    6242332.232371942
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.018438285787681,
   "start_distance_m": 81.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 83.5,
   "start_elevation_m": 88.40474454030277,
   "end_elevation_m": 88.00382262601339,
   "start_xy": [
    897209.0381721263,
    6242543.534049879
   ],
   "end_xy": [
    897204.190590906,
    6242542.354982329
   ]
  },
  "min_10m": {
   "gradient_pct": -6.811838792460918,
   "start_distance_m": 77.0,
   "end_distance_m": 87.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 88.62884855203286,
   "end_elevation_m": 87.94766467278677,
   "start_xy": [
    897213.0224764001,
    6242543.888054757
   ],
   "end_xy": [
    897203.2569892118,
    6242542.03776517
   ]
  },
  "min_20m": {
   "gradient_pct": -5.215138765361047,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 90.73934285437677,
   "end_elevation_m": 89.69631510130456,
   "start_xy": [
    897285.147,
    6242532.792
   ],
   "end_xy": [
    897269.0020865744,
    6242544.168874039
   ]
  },
  "min_25m": {
   "gradient_pct": -4.518918287085455,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 90.73934285437677,
   "end_elevation_m": 89.60961328260541,
   "start_xy": [
    897285.147,
    6242532.792
   ],
   "end_xy": [
    897264.4435457558,
    6242546.143670239
   ]
  },
  "min_50m": {
   "gradient_pct": -3.2848631436166613,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 90.73934285437677,
   "end_elevation_m": 89.09691128256844,
   "start_xy": [
    897285.147,
    6242532.792
   ],
   "end_xy": [
    897239.877227068,
    6242546.640824722
   ]
  },
  "min_100m": {
   "gradient_pct": -2.3647145207289384,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 90.73934285437677,
   "end_elevation_m": 88.37462833364783,
   "start_xy": [
    897285.147,
    6242532.792
   ],
   "end_xy": [
    897199.8646838224,
    6242530.076651909
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.64066178120754,
   "start_distance_m": 264.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 109.57002083301025,
   "end_elevation_m": 110.0828340686344,
   "start_xy": [
    897308.0211673923,
    6242409.71989897
   ],
   "end_xy": [
    897308.91444129,
    6242407.930468406
   ]
  },
  "max_3m": {
   "gradient_pct": 24.894309013422838,
   "start_distance_m": 331.0,
   "end_distance_m": 334.0,
   "midpoint_distance_m": 332.5,
   "start_elevation_m": 123.20004497361143,
   "end_elevation_m": 123.94687424401411,
   "start_xy": [
    897321.8341221092,
    6242345.232021095
   ],
   "end_xy": [
    897321.8561625585,
    6242342.23210206
   ]
  }
 },
 "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": 0.301,
   "obstruction_max_height_m": 13.68,
   "flagged_windows_m": [
    2,
    100
   ]
  },
  "review": [],
  "extent": [
   "descends_at_start",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "41205ec4649bb0a4093af76ff34281a5d9a13832",
   "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-pr3",
   "road_pbf": "block-batch-fr-pr3.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:ba95a0bf562c86eb"
  },
  "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_E897-N6242_0m5@21LHD7PQ-2025-03-14.tif"
  ],
  "calculated_at": "2026-09-25T09:18:52+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-pr3.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-pr3",
  "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": [
   "E897-N6242"
  ],
  "elevation_blocks": [
   "21LHD7PQ@2025-03-14"
  ],
  "ign_dalles": [
   "LHD_FXX_0897_6243_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD7PQ"
  ],
  "ign_editions": [
   "2025-03-14"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0897_6243_MNT_O_0M50_LAMB93_IGN69": "2025-03-14"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 1,
  "carriageway": {
   "stations": 20,
   "stations_resolved": 20,
   "width_median_m": 4.38,
   "width_p10_m": 2.48,
   "width_min_m": 1.75,
   "width_max_m": 10.75,
   "bounded_share": 0.3,
   "unbounded_share": 0.7,
   "confidence_median": 0.0,
   "width_median_bounded_m": 3.0,
   "window_m": [
    319.0,
    344.0
   ],
   "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": 20,
    "stations_resolved": 20,
    "width_median_m": 2.62,
    "width_p10_m": 1.23,
    "width_min_m": 1.0,
    "width_max_m": 11.25,
    "bounded_share": 0.95,
    "unbounded_share": 0.05,
    "confidence_median": 1.0,
    "width_median_bounded_m": 2.5,
    "window_m": [
     319.0,
     344.0
    ],
    "width_at_max25_m": 5.75,
    "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": "Marseille",
  "county": "Bouches-du-Rh\u00f4ne",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}