{
 "ocl_version": "0.1.0",
 "name": "Chemin de la Visite",
 "slug": "chemin-de-la-visite",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.96609914255157,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 576.0,
   "end_distance_m": 578.0,
   "start_elevation_m": 456.13990858271137,
   "end_elevation_m": 456.6992305655624,
   "min_gradient_pct": -2.8618488093400174
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.855193224805436,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 575.0,
   "end_distance_m": 578.0,
   "start_elevation_m": 455.86357476881824,
   "end_elevation_m": 456.6992305655624,
   "min_gradient_pct": -2.4877031876447595
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.377967175998492,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 575.0,
   "end_distance_m": 580.0,
   "start_elevation_m": 455.86357476881824,
   "end_elevation_m": 457.23247312761816,
   "min_gradient_pct": -2.178120450912502
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.787887109015855,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 573.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 455.3412099651985,
   "end_elevation_m": 458.0199986761001,
   "min_gradient_pct": -1.252140931443364
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.17999125366771,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 574.0,
   "end_distance_m": 594.0,
   "start_elevation_m": 455.59601675850297,
   "end_elevation_m": 460.6320150092365,
   "min_gradient_pct": 0.39015942060274256
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.038377494365704,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 571.0,
   "end_distance_m": 596.0,
   "start_elevation_m": 454.8602080427802,
   "end_elevation_m": 461.1198024163716,
   "min_gradient_pct": 1.240301102934609
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 24.984339838931078,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 572.0,
   "end_distance_m": 622.0,
   "start_elevation_m": 455.09881840668845,
   "end_elevation_m": 467.590988326154,
   "min_gradient_pct": 3.0076572367977406
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.896504027624413,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 527.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 445.8838142481343,
   "end_elevation_m": 468.7803182757587,
   "min_gradient_pct": 3.5222708172360058
  }
 ],
 "shape": {
  "ascent_concentration": 0.387,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 299.0,
  "shape_class": "sustained"
 },
 "length_m": 628.2463095028972,
 "start_elevation_m": 381.97270236340074,
 "end_elevation_m": 469.0037357905801,
 "endpoint_gain_m": 87.03103342717935,
 "overall_gradient_pct": 13.8530114878101,
 "accumulated_ascent_m": 87.17134287607217,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.377967175998492,
   "start_distance_m": 575.0,
   "end_distance_m": 580.0,
   "midpoint_distance_m": 577.5,
   "start_elevation_m": 455.86357476881824,
   "end_elevation_m": 457.23247312761816,
   "start_xy": [
    876549.5918788657,
    6480176.068006601
   ],
   "end_xy": [
    876545.8350293547,
    6480179.3674128745
   ]
  },
  "max_10m": {
   "gradient_pct": 26.787887109015855,
   "start_distance_m": 573.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 578.0,
   "start_elevation_m": 455.3412099651985,
   "end_elevation_m": 458.0199986761001,
   "start_xy": [
    876551.0946186701,
    6480174.748244093
   ],
   "end_xy": [
    876543.580919648,
    6480181.3470566375
   ]
  },
  "max_20m": {
   "gradient_pct": 25.17999125366771,
   "start_distance_m": 574.0,
   "end_distance_m": 594.0,
   "midpoint_distance_m": 584.0,
   "start_elevation_m": 455.59601675850297,
   "end_elevation_m": 460.6320150092365,
   "start_xy": [
    876550.3432487679,
    6480175.408125347
   ],
   "end_xy": [
    876536.0877805486,
    6480189.376382299
   ]
  },
  "max_25m": {
   "gradient_pct": 25.038377494365704,
   "start_distance_m": 571.0,
   "end_distance_m": 596.0,
   "midpoint_distance_m": 583.5,
   "start_elevation_m": 454.8602080427802,
   "end_elevation_m": 461.1198024163716,
   "start_xy": [
    876552.8489479687,
    6480173.800961627
   ],
   "end_xy": [
    876534.7705488174,
    6480190.881340958
   ]
  },
  "max_50m": {
   "gradient_pct": 24.984339838931078,
   "start_distance_m": 572.0,
   "end_distance_m": 622.0,
   "midpoint_distance_m": 597.0,
   "start_elevation_m": 455.09881840668845,
   "end_elevation_m": 467.590988326154,
   "start_xy": [
    876551.9562272042,
    6480174.25157192
   ],
   "end_xy": [
    876513.4735509917,
    6480205.0721109435
   ]
  },
  "max_100m": {
   "gradient_pct": 22.896504027624413,
   "start_distance_m": 527.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 577.0,
   "start_elevation_m": 445.8838142481343,
   "end_elevation_m": 468.7803182757587,
   "start_xy": [
    876591.7450773565,
    6480154.683632973
   ],
   "end_xy": [
    876509.0128762611,
    6480207.330955991
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.178120450912502,
   "start_distance_m": 211.0,
   "end_distance_m": 216.0,
   "midpoint_distance_m": 213.5,
   "start_elevation_m": 405.91082488346285,
   "end_elevation_m": 405.8019188609172,
   "start_xy": [
    876501.6644163696,
    6479907.650021965
   ],
   "end_xy": [
    876506.6288957476,
    6479908.244954318
   ]
  },
  "min_10m": {
   "gradient_pct": -1.252140931443364,
   "start_distance_m": 209.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 214.0,
   "start_elevation_m": 405.92242012811676,
   "end_elevation_m": 405.7972060349724,
   "start_xy": [
    876500.024315537,
    6479907.116465272
   ],
   "end_xy": [
    876509.6075833744,
    6479908.601913731
   ]
  },
  "min_20m": {
   "gradient_pct": 0.39015942060274256,
   "start_distance_m": 209.0,
   "end_distance_m": 229.0,
   "midpoint_distance_m": 219.0,
   "start_elevation_m": 405.92242012811676,
   "end_elevation_m": 406.0004520122373,
   "start_xy": [
    876500.024315537,
    6479907.116465272
   ],
   "end_xy": [
    876519.5365421303,
    6479909.791778438
   ]
  },
  "min_25m": {
   "gradient_pct": 1.240301102934609,
   "start_distance_m": 209.0,
   "end_distance_m": 234.0,
   "midpoint_distance_m": 221.5,
   "start_elevation_m": 405.92242012811676,
   "end_elevation_m": 406.2324954038504,
   "start_xy": [
    876500.024315537,
    6479907.116465272
   ],
   "end_xy": [
    876524.3599279083,
    6479911.0892600175
   ]
  },
  "min_50m": {
   "gradient_pct": 3.0076572367977406,
   "start_distance_m": 209.0,
   "end_distance_m": 259.0,
   "midpoint_distance_m": 234.0,
   "start_elevation_m": 405.92242012811676,
   "end_elevation_m": 407.4262487465156,
   "start_xy": [
    876500.024315537,
    6479907.116465272
   ],
   "end_xy": [
    876548.406113663,
    6479917.928920145
   ]
  },
  "min_100m": {
   "gradient_pct": 3.5222708172360058,
   "start_distance_m": 209.0,
   "end_distance_m": 309.0,
   "midpoint_distance_m": 259.0,
   "start_elevation_m": 405.92242012811676,
   "end_elevation_m": 409.44469094535276,
   "start_xy": [
    876500.024315537,
    6479907.116465272
   ],
   "end_xy": [
    876592.1835659137,
    6479940.737971603
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.96609914255157,
   "start_distance_m": 576.0,
   "end_distance_m": 578.0,
   "midpoint_distance_m": 577.0,
   "start_elevation_m": 456.13990858271137,
   "end_elevation_m": 456.6992305655624,
   "start_xy": [
    876548.8405089634,
    6480176.727887856
   ],
   "end_xy": [
    876547.3377691591,
    6480178.047650365
   ]
  },
  "max_3m": {
   "gradient_pct": 27.855193224805436,
   "start_distance_m": 575.0,
   "end_distance_m": 578.0,
   "midpoint_distance_m": 576.5,
   "start_elevation_m": 455.86357476881824,
   "end_elevation_m": 456.6992305655624,
   "start_xy": [
    876549.5918788657,
    6480176.068006601
   ],
   "end_xy": [
    876547.3377691591,
    6480178.047650365
   ]
  }
 },
 "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": 0.035,
   "obstruction_max_height_m": 17.03,
   "flagged_windows_m": []
  },
  "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_E876-N6479_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E876-N6480_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:35:01+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": [
   "E876-N6479",
   "E876-N6480"
  ],
  "elevation_blocks": [
   "21LHD6OM@2024-10-24"
  ],
  "ign_dalles": [
   "LHD_FXX_0876_6480_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0876_6481_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6OM"
  ],
  "ign_editions": [
   "2024-10-24"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0876_6480_MNT_O_0M50_LAMB93_IGN69": "2024-10-24",
   "LHD_FXX_0876_6481_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": 32,
   "stations_resolved": 32,
   "width_median_m": 7.0,
   "width_p10_m": 3.0,
   "width_min_m": 2.5,
   "width_max_m": 12.0,
   "bounded_share": 0.25,
   "unbounded_share": 0.75,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.38,
   "window_m": [
    571.0,
    596.0
   ],
   "width_at_max25_m": 3.25,
   "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": 32,
    "stations_resolved": 32,
    "width_median_m": 7.5,
    "width_p10_m": 1.33,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.5,
    "unbounded_share": 0.5,
    "confidence_median": 0.5,
    "width_median_bounded_m": 3.38,
    "window_m": [
     571.0,
     596.0
    ],
    "width_at_max25_m": 2.25,
    "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": "La C\u00f4te-Saint-Andr\u00e9",
  "county": "Is\u00e8re",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}