{
 "ocl_version": "0.1.0",
 "name": "Chemin des Sabli\u00e8res",
 "slug": "chemin-des-sablieres",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 30.29544069008523,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 123.0,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 318.2995616970361,
   "min_gradient_pct": -12.081201237199934
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.884190834512918,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "start_elevation_m": 317.9670542145036,
   "end_elevation_m": 318.833579939539,
   "min_gradient_pct": -6.295021218448937
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.013177840456365,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 126.0,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 319.0943117752572,
   "min_gradient_pct": -5.971733195862043
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.466816727945343,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 131.0,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 320.2403345560289,
   "min_gradient_pct": -5.61452172191764
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.16539860587028,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 321.6810088371037,
   "min_gradient_pct": -5.411697752425653
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.072749106348738,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 143.0,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 322.56611639251685,
   "min_gradient_pct": -5.100297400715817
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.469291981928336,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 168.0,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 325.78257510689383,
   "min_gradient_pct": -3.671555701199736
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.199390826607043,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 87.0,
   "end_distance_m": 187.0,
   "start_elevation_m": 315.16779132474545,
   "end_elevation_m": 327.3671821513525,
   "min_gradient_pct": -2.3773345143545725
  }
 ],
 "shape": {
  "ascent_concentration": 0.448,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 67.0,
  "shape_class": "sustained"
 },
 "length_m": 574.2717403263395,
 "start_elevation_m": 308.7489754882812,
 "end_elevation_m": 340.2864686115805,
 "endpoint_gain_m": 31.537493123299328,
 "overall_gradient_pct": 5.491736909320599,
 "accumulated_ascent_m": 34.62981997852518,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.013177840456365,
   "start_distance_m": 121.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 319.0943117752572,
   "start_xy": [
    1034539.123192836,
    6301427.145077348
   ],
   "end_xy": [
    1034536.6417404866,
    6301422.804294672
   ]
  },
  "max_10m": {
   "gradient_pct": 25.466816727945343,
   "start_distance_m": 121.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 126.0,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 320.2403345560289,
   "start_xy": [
    1034539.123192836,
    6301427.145077348
   ],
   "end_xy": [
    1034534.1602881373,
    6301418.463511997
   ]
  },
  "max_20m": {
   "gradient_pct": 23.16539860587028,
   "start_distance_m": 118.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 128.0,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 321.6810088371037,
   "start_xy": [
    1034541.0312647064,
    6301428.731700901
   ],
   "end_xy": [
    1034530.8069397486,
    6301412.333407221
   ]
  },
  "max_25m": {
   "gradient_pct": 22.072749106348738,
   "start_distance_m": 118.0,
   "end_distance_m": 143.0,
   "midpoint_distance_m": 130.5,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 322.56611639251685,
   "start_xy": [
    1034541.0312647064,
    6301428.731700901
   ],
   "end_xy": [
    1034529.289215483,
    6301407.569321469
   ]
  },
  "max_50m": {
   "gradient_pct": 17.469291981928336,
   "start_distance_m": 118.0,
   "end_distance_m": 168.0,
   "midpoint_distance_m": 143.0,
   "start_elevation_m": 317.04792911592966,
   "end_elevation_m": 325.78257510689383,
   "start_xy": [
    1034541.0312647064,
    6301428.731700901
   ],
   "end_xy": [
    1034519.3532053235,
    6301385.011503782
   ]
  },
  "max_100m": {
   "gradient_pct": 12.199390826607043,
   "start_distance_m": 87.0,
   "end_distance_m": 187.0,
   "midpoint_distance_m": 137.0,
   "start_elevation_m": 315.16779132474545,
   "end_elevation_m": 327.3671821513525,
   "start_xy": [
    1034570.907213149,
    6301420.459596897
   ],
   "end_xy": [
    1034502.0128106851,
    6301377.294803506
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.971733195862043,
   "start_distance_m": 393.0,
   "end_distance_m": 398.0,
   "midpoint_distance_m": 395.5,
   "start_elevation_m": 331.51696551431354,
   "end_elevation_m": 331.21837885452044,
   "start_xy": [
    1034300.4979719569,
    6301344.882662169
   ],
   "end_xy": [
    1034295.4982305071,
    6301344.933509358
   ]
  },
  "min_10m": {
   "gradient_pct": -5.61452172191764,
   "start_distance_m": 396.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 401.0,
   "start_elevation_m": 331.34612138623544,
   "end_elevation_m": 330.7846692140437,
   "start_xy": [
    1034297.498127087,
    6301344.913170482
   ],
   "end_xy": [
    1034287.4986474086,
    6301345.015171875
   ]
  },
  "min_20m": {
   "gradient_pct": -5.411697752425653,
   "start_distance_m": 386.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 396.0,
   "start_elevation_m": 331.8670087645288,
   "end_elevation_m": 330.7846692140437,
   "start_xy": [
    1034307.492403667,
    6301344.626284053
   ],
   "end_xy": [
    1034287.4986474086,
    6301345.015171875
   ]
  },
  "min_25m": {
   "gradient_pct": -5.100297400715817,
   "start_distance_m": 384.0,
   "end_distance_m": 409.0,
   "midpoint_distance_m": 396.5,
   "start_elevation_m": 331.94561105604475,
   "end_elevation_m": 330.6705367058658,
   "start_xy": [
    1034309.4902841991,
    6301344.534233091
   ],
   "end_xy": [
    1034284.4988227374,
    6301345.047605525
   ]
  },
  "min_50m": {
   "gradient_pct": -3.671555701199736,
   "start_distance_m": 370.0,
   "end_distance_m": 420.0,
   "midpoint_distance_m": 395.0,
   "start_elevation_m": 332.2810816691605,
   "end_elevation_m": 330.44530381856066,
   "start_xy": [
    1034323.4764061666,
    6301343.994132049
   ],
   "end_xy": [
    1034273.4994656093,
    6301345.166528905
   ]
  },
  "min_100m": {
   "gradient_pct": -2.3773345143545725,
   "start_distance_m": 360.0,
   "end_distance_m": 460.0,
   "midpoint_distance_m": 410.0,
   "start_elevation_m": 332.3495608738003,
   "end_elevation_m": 329.97222635944576,
   "start_xy": [
    1034333.4725811118,
    6301344.270693913
   ],
   "end_xy": [
    1034234.8782428134,
    6301335.088604602
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 30.29544069008523,
   "start_distance_m": 121.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 317.6936528832344,
   "end_elevation_m": 318.2995616970361,
   "start_xy": [
    1034539.123192836,
    6301427.145077348
   ],
   "end_xy": [
    1034538.1306118962,
    6301425.408764278
   ]
  },
  "max_3m": {
   "gradient_pct": 28.884190834512918,
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 317.9670542145036,
   "end_elevation_m": 318.833579939539,
   "start_xy": [
    1034538.626902366,
    6301426.276920813
   ],
   "end_xy": [
    1034537.1380309565,
    6301423.672451207
   ]
  }
 },
 "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": 0.083,
   "obstruction_max_height_m": 10.88,
   "flagged_windows_m": [
    100
   ]
  },
  "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_E1034-N6301_0m5.tif"
  ],
  "calculated_at": "2026-09-17T02:47:36+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps4.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps4",
  "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": [
   "E1034-N6301"
  ],
  "elevation_blocks": [
   "21LHD8RP@2025-03-06"
  ],
  "ign_dalles": [
   "LHD_FXX_1034_6302_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD8RP"
  ],
  "ign_editions": [
   "2025-03-06"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_1034_6302_MNT_O_0M50_LAMB93_IGN69": "2025-03-06"
  },
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 29,
   "stations_resolved": 29,
   "width_median_m": 5.5,
   "width_p10_m": 3.2,
   "width_min_m": 1.0,
   "width_max_m": 12.0,
   "bounded_share": 0.31,
   "unbounded_share": 0.69,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.5,
   "window_m": [
    118.0,
    143.0
   ],
   "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": 29,
    "stations_resolved": 29,
    "width_median_m": 3.25,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.828,
    "unbounded_share": 0.172,
    "confidence_median": 1.0,
    "width_median_bounded_m": 2.88,
    "window_m": [
     118.0,
     143.0
    ],
    "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": "La Gaude",
  "county": "Alpes-Maritimes",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}