{
 "ocl_version": "0.1.0",
 "name": "Impasse de Peyrolland",
 "slug": "impasse-de-peyrolland",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.495632364202493,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 90.0,
   "end_distance_m": 92.0,
   "start_elevation_m": 189.73684027956998,
   "end_elevation_m": 190.26675292685402,
   "min_gradient_pct": -3.321137150624054
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.7696371209704,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 89.0,
   "end_distance_m": 92.0,
   "start_elevation_m": 189.4936638132249,
   "end_elevation_m": 190.26675292685402,
   "min_gradient_pct": -2.308574327973171
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.33295879122818,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 89.0,
   "end_distance_m": 94.0,
   "start_elevation_m": 189.4936638132249,
   "end_elevation_m": 190.76031175278632,
   "min_gradient_pct": 2.0724874598181486
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.18327913569499,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 84.0,
   "end_distance_m": 94.0,
   "start_elevation_m": 188.34198383921682,
   "end_elevation_m": 190.76031175278632,
   "min_gradient_pct": 2.491529939791235
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.086843392327182,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 10.0,
   "end_distance_m": 30.0,
   "start_elevation_m": 173.5345866080779,
   "end_elevation_m": 177.95195528654332,
   "min_gradient_pct": 2.8707244214334082
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.030580393095192,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 12.0,
   "end_distance_m": 37.0,
   "start_elevation_m": 173.9590394573429,
   "end_elevation_m": 179.4666845556167,
   "min_gradient_pct": 3.0331645222712496
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.583911035840174,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5.0,
   "end_distance_m": 55.0,
   "start_elevation_m": 172.54297192300965,
   "end_elevation_m": 182.83492744092973,
   "min_gradient_pct": 3.379155161366782
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.69376296275263,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1.0,
   "end_distance_m": 101.0,
   "start_elevation_m": 172.23661530497435,
   "end_elevation_m": 191.93037826772698,
   "min_gradient_pct": 5.596308665989113
  }
 ],
 "shape": {
  "ascent_concentration": 0.482,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 105.0,
  "shape_class": "stepped"
 },
 "length_m": 380.4591106736823,
 "start_elevation_m": 172.19021868946606,
 "end_elevation_m": 212.26102127929607,
 "endpoint_gain_m": 40.07080258983001,
 "overall_gradient_pct": 10.532223165552873,
 "accumulated_ascent_m": 40.140059819669204,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.33295879122818,
   "start_distance_m": 89.0,
   "end_distance_m": 94.0,
   "midpoint_distance_m": 91.5,
   "start_elevation_m": 189.4936638132249,
   "end_elevation_m": 190.76031175278632,
   "start_xy": [
    835671.6267668458,
    6480202.279821352
   ],
   "end_xy": [
    835666.6413195067,
    6480202.633568917
   ]
  },
  "max_10m": {
   "gradient_pct": 24.18327913569499,
   "start_distance_m": 84.0,
   "end_distance_m": 94.0,
   "midpoint_distance_m": 89.0,
   "start_elevation_m": 188.34198383921682,
   "end_elevation_m": 190.76031175278632,
   "start_xy": [
    835676.6196578206,
    6480202.013288588
   ],
   "end_xy": [
    835666.6413195067,
    6480202.633568917
   ]
  },
  "max_20m": {
   "gradient_pct": 22.086843392327182,
   "start_distance_m": 10.0,
   "end_distance_m": 30.0,
   "midpoint_distance_m": 20.0,
   "start_elevation_m": 173.5345866080779,
   "end_elevation_m": 177.95195528654332,
   "start_xy": [
    835750.5144442469,
    6480198.068603683
   ],
   "end_xy": [
    835730.5428803479,
    6480199.134734739
   ]
  },
  "max_25m": {
   "gradient_pct": 22.030580393095192,
   "start_distance_m": 12.0,
   "end_distance_m": 37.0,
   "midpoint_distance_m": 24.5,
   "start_elevation_m": 173.9590394573429,
   "end_elevation_m": 179.4666845556167,
   "start_xy": [
    835748.517287857,
    6480198.175216788
   ],
   "end_xy": [
    835723.5528329832,
    6480199.507880608
   ]
  },
  "max_50m": {
   "gradient_pct": 20.583911035840174,
   "start_distance_m": 5.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 30.0,
   "start_elevation_m": 172.54297192300965,
   "end_elevation_m": 182.83492744092973,
   "start_xy": [
    835755.4880659597,
    6480197.863669697
   ],
   "end_xy": [
    835705.5784254741,
    6480200.467398558
   ]
  },
  "max_100m": {
   "gradient_pct": 19.69376296275263,
   "start_distance_m": 1.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 51.0,
   "start_elevation_m": 172.23661530497435,
   "end_elevation_m": 191.93037826772698,
   "start_xy": [
    835758.6488131919,
    6480200.3151339395
   ],
   "end_xy": [
    835659.689137255,
    6480203.450368734
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.0724874598181486,
   "start_distance_m": 120.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 122.5,
   "start_elevation_m": 192.74946733469534,
   "end_elevation_m": 192.85309170768625,
   "start_xy": [
    835657.1560087624,
    6480222.124004322
   ],
   "end_xy": [
    835656.2823826635,
    6480227.047090492
   ]
  },
  "min_10m": {
   "gradient_pct": 2.491529939791235,
   "start_distance_m": 120.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 125.0,
   "start_elevation_m": 192.74946733469534,
   "end_elevation_m": 192.99862032867446,
   "start_xy": [
    835657.1560087624,
    6480222.124004322
   ],
   "end_xy": [
    835655.4087565644,
    6480231.970176662
   ]
  },
  "min_20m": {
   "gradient_pct": 2.8707244214334082,
   "start_distance_m": 115.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 125.0,
   "start_elevation_m": 192.58275922489378,
   "end_elevation_m": 193.15690410918046,
   "start_xy": [
    835657.839928094,
    6480217.172696806
   ],
   "end_xy": [
    835654.5351304654,
    6480236.893262832
   ]
  },
  "min_25m": {
   "gradient_pct": 3.0331645222712496,
   "start_distance_m": 111.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 192.43873267525248,
   "end_elevation_m": 193.1970238058203,
   "start_xy": [
    835658.3177173682,
    6480213.201334645
   ],
   "end_xy": [
    835654.3604052456,
    6480237.877880067
   ]
  },
  "min_50m": {
   "gradient_pct": 3.379155161366782,
   "start_distance_m": 111.0,
   "end_distance_m": 161.0,
   "midpoint_distance_m": 136.0,
   "start_elevation_m": 192.43873267525248,
   "end_elevation_m": 194.12831025593587,
   "start_xy": [
    835658.3177173682,
    6480213.201334645
   ],
   "end_xy": [
    835645.5076387769,
    6480261.003932505
   ]
  },
  "min_100m": {
   "gradient_pct": 5.596308665989113,
   "start_distance_m": 101.0,
   "end_distance_m": 201.0,
   "midpoint_distance_m": 151.0,
   "start_elevation_m": 191.93037826772698,
   "end_elevation_m": 197.5266869337161,
   "start_xy": [
    835659.689137255,
    6480203.450368734
   ],
   "end_xy": [
    835628.638177251,
    6480248.969196395
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.495632364202493,
   "start_distance_m": 90.0,
   "end_distance_m": 92.0,
   "midpoint_distance_m": 91.0,
   "start_elevation_m": 189.73684027956998,
   "end_elevation_m": 190.26675292685402,
   "start_xy": [
    835670.6281886508,
    6480202.333127905
   ],
   "end_xy": [
    835668.631032261,
    6480202.439741011
   ]
  },
  "max_3m": {
   "gradient_pct": 25.7696371209704,
   "start_distance_m": 89.0,
   "end_distance_m": 92.0,
   "midpoint_distance_m": 90.5,
   "start_elevation_m": 189.4936638132249,
   "end_elevation_m": 190.26675292685402,
   "start_xy": [
    835671.6267668458,
    6480202.279821352
   ],
   "end_xy": [
    835668.631032261,
    6480202.439741011
   ]
  }
 },
 "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": 0.021,
   "obstruction_max_height_m": 5.89,
   "flagged_windows_m": [
    20
   ]
  },
  "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_E835-N6480_0m5.tif"
  ],
  "calculated_at": "2026-09-17T04:19:36+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": [
   "E835-N6480"
  ],
  "elevation_blocks": [
   "22LHD5NM@2025-02-27"
  ],
  "ign_dalles": [
   "LHD_FXX_0835_6481_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD5NM"
  ],
  "ign_editions": [
   "2025-02-27"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0835_6481_MNT_O_0M50_LAMB93_IGN69": "2025-02-27"
  },
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 22,
   "stations_resolved": 22,
   "width_median_m": 4.75,
   "width_p10_m": 4.0,
   "width_min_m": 3.25,
   "width_max_m": 12.0,
   "bounded_share": 0.409,
   "unbounded_share": 0.591,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.5,
   "window_m": [
    12.0,
    37.0
   ],
   "width_at_max25_m": 5.25,
   "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": 22,
    "stations_resolved": 22,
    "width_median_m": 5.0,
    "width_p10_m": 1.3,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.818,
    "unbounded_share": 0.182,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.5,
    "window_m": [
     12.0,
     37.0
    ],
    "width_at_max25_m": 1.75,
    "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": "Chavanay",
  "county": "Loire",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}