{
 "ocl_version": "0.1.0",
 "name": "Chemin de la Vierge",
 "slug": "chemin-de-la-vierge",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.27199170776112,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 197.0,
   "end_distance_m": 199.0,
   "start_elevation_m": 444.4524346359726,
   "end_elevation_m": 445.11787447012784,
   "min_gradient_pct": -18.360675058667653
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 30.40933028529859,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 196.0,
   "end_distance_m": 199.0,
   "start_elevation_m": 444.2055945615689,
   "end_elevation_m": 445.11787447012784,
   "min_gradient_pct": -13.415676091256046
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.622139806294626,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 194.0,
   "end_distance_m": 199.0,
   "start_elevation_m": 443.6867674798131,
   "end_elevation_m": 445.11787447012784,
   "min_gradient_pct": -3.240954618300975
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.549866035393052,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 176.0,
   "end_distance_m": 186.0,
   "start_elevation_m": 439.77908320121276,
   "end_elevation_m": 442.33406980475206,
   "min_gradient_pct": 1.0349856466746132
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.269334637408576,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 179.0,
   "end_distance_m": 199.0,
   "start_elevation_m": 440.46400754264613,
   "end_elevation_m": 445.11787447012784,
   "min_gradient_pct": 5.286954708482483
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.95635553651664,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 174.0,
   "end_distance_m": 199.0,
   "start_elevation_m": 439.3787855859987,
   "end_elevation_m": 445.11787447012784,
   "min_gradient_pct": 7.012543890188226
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.64213813996514,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 166.0,
   "end_distance_m": 216.0,
   "start_elevation_m": 437.8162863768722,
   "end_elevation_m": 448.63735544685477,
   "min_gradient_pct": 12.64701815598778
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.703532465786225,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 116.0,
   "end_distance_m": 216.0,
   "start_elevation_m": 428.93382298106854,
   "end_elevation_m": 448.63735544685477,
   "min_gradient_pct": 15.778143488567764
  }
 ],
 "shape": {
  "ascent_concentration": 0.298,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 },
 "length_m": 290.260652553244,
 "start_elevation_m": 410.29075656152366,
 "end_elevation_m": 458.6795087109473,
 "endpoint_gain_m": 48.388752149423624,
 "overall_gradient_pct": 16.67079286282092,
 "accumulated_ascent_m": 49.04865208880665,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.622139806294626,
   "start_distance_m": 194.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 196.5,
   "start_elevation_m": 443.6867674798131,
   "end_elevation_m": 445.11787447012784,
   "start_xy": [
    907393.7015057793,
    6460273.470056922
   ],
   "end_xy": [
    907392.6666548811,
    6460268.6073351875
   ]
  },
  "max_10m": {
   "gradient_pct": 25.549866035393052,
   "start_distance_m": 176.0,
   "end_distance_m": 186.0,
   "midpoint_distance_m": 181.0,
   "start_elevation_m": 439.77908320121276,
   "end_elevation_m": 442.33406980475206,
   "start_xy": [
    907393.7673910612,
    6460291.183858095
   ],
   "end_xy": [
    907394.9117445046,
    6460281.331552243
   ]
  },
  "max_20m": {
   "gradient_pct": 23.269334637408576,
   "start_distance_m": 179.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 189.0,
   "start_elevation_m": 440.46400754264613,
   "end_elevation_m": 445.11787447012784,
   "start_xy": [
    907394.4182750648,
    6460288.255317501
   ],
   "end_xy": [
    907392.6666548811,
    6460268.6073351875
   ]
  },
  "max_25m": {
   "gradient_pct": 22.95635553651664,
   "start_distance_m": 174.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 186.5,
   "start_elevation_m": 439.3787855859987,
   "end_elevation_m": 445.11787447012784,
   "start_xy": [
    907393.3365278905,
    6460293.136894261
   ],
   "end_xy": [
    907392.6666548811,
    6460268.6073351875
   ]
  },
  "max_50m": {
   "gradient_pct": 21.64213813996514,
   "start_distance_m": 166.0,
   "end_distance_m": 216.0,
   "midpoint_distance_m": 191.0,
   "start_elevation_m": 437.8162863768722,
   "end_elevation_m": 448.63735544685477,
   "start_xy": [
    907391.6213776155,
    6460300.950872732
   ],
   "end_xy": [
    907391.4164963502,
    6460251.773285963
   ]
  },
  "max_100m": {
   "gradient_pct": 19.703532465786225,
   "start_distance_m": 116.0,
   "end_distance_m": 216.0,
   "midpoint_distance_m": 166.0,
   "start_elevation_m": 428.93382298106854,
   "end_elevation_m": 448.63735544685477,
   "start_xy": [
    907424.8739974796,
    6460309.524328412
   ],
   "end_xy": [
    907391.4164963502,
    6460251.773285963
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.240954618300975,
   "start_distance_m": 225.0,
   "end_distance_m": 230.0,
   "midpoint_distance_m": 227.5,
   "start_elevation_m": 449.1217563460329,
   "end_elevation_m": 448.95970861511785,
   "start_xy": [
    907388.6822640583,
    6460243.228269891
   ],
   "end_xy": [
    907387.5707415715,
    6460238.369795975
   ]
  },
  "min_10m": {
   "gradient_pct": 1.0349856466746132,
   "start_distance_m": 218.0,
   "end_distance_m": 228.0,
   "midpoint_distance_m": 223.0,
   "start_elevation_m": 448.61578749862775,
   "end_elevation_m": 448.7192860632952,
   "start_xy": [
    907390.9998307386,
    6460249.817169973
   ],
   "end_xy": [
    907387.9318587956,
    6460240.336924428
   ]
  },
  "min_20m": {
   "gradient_pct": 5.286954708482483,
   "start_distance_m": 216.0,
   "end_distance_m": 236.0,
   "midpoint_distance_m": 226.0,
   "start_elevation_m": 448.63735544685477,
   "end_elevation_m": 449.69474638855127,
   "start_xy": [
    907391.4164963502,
    6460251.773285963
   ],
   "end_xy": [
    907386.4873898993,
    6460232.468410616
   ]
  },
  "min_25m": {
   "gradient_pct": 7.012543890188226,
   "start_distance_m": 216.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 228.5,
   "start_elevation_m": 448.63735544685477,
   "end_elevation_m": 450.3904914194018,
   "start_xy": [
    907391.4164963502,
    6460251.773285963
   ],
   "end_xy": [
    907385.690037063,
    6460227.532540604
   ]
  },
  "min_50m": {
   "gradient_pct": 12.64701815598778,
   "start_distance_m": 216.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 241.0,
   "start_elevation_m": 448.63735544685477,
   "end_elevation_m": 454.96086452484866,
   "start_xy": [
    907391.4164963502,
    6460251.773285963
   ],
   "end_xy": [
    907383.8582121063,
    6460202.925001484
   ]
  },
  "min_100m": {
   "gradient_pct": 15.778143488567764,
   "start_distance_m": 190.0,
   "end_distance_m": 290.0,
   "midpoint_distance_m": 240.0,
   "start_elevation_m": 442.8742361963737,
   "end_elevation_m": 458.6523796849415,
   "start_xy": [
    907394.7183133146,
    6460277.338661636
   ],
   "end_xy": [
    907389.0167796889,
    6460180.378777157
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.27199170776112,
   "start_distance_m": 197.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 198.0,
   "start_elevation_m": 444.4524346359726,
   "end_elevation_m": 445.11787447012784,
   "start_xy": [
    907392.9389001279,
    6460270.568603386
   ],
   "end_xy": [
    907392.6666548811,
    6460268.6073351875
   ]
  },
  "max_3m": {
   "gradient_pct": 30.40933028529859,
   "start_distance_m": 196.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 197.5,
   "start_elevation_m": 444.2055945615689,
   "end_elevation_m": 445.11787447012784,
   "start_xy": [
    907393.1931020117,
    6460271.535754565
   ],
   "end_xy": [
    907392.6666548811,
    6460268.6073351875
   ]
  }
 },
 "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": 0.281,
   "obstruction_max_height_m": 13.25,
   "flagged_windows_m": [
    2,
    3,
    5,
    20,
    25,
    50,
    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_E907-N6460_0m5.tif"
  ],
  "calculated_at": "2026-09-17T02:33:33+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps2.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps2",
  "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": [
   "E907-N6460"
  ],
  "elevation_blocks": [
   "21LHD6PM@2025-03-25"
  ],
  "ign_dalles": [
   "LHD_FXX_0907_6461_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6PM"
  ],
  "ign_editions": [
   "2025-03-25"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0907_6461_MNT_O_0M50_LAMB93_IGN69": "2025-03-25"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 5,
  "carriageway": {
   "stations": 18,
   "stations_resolved": 18,
   "width_median_m": 3.25,
   "width_p10_m": 1.18,
   "width_min_m": 0.75,
   "width_max_m": 8.25,
   "bounded_share": 0.5,
   "unbounded_share": 0.5,
   "confidence_median": 0.251,
   "width_median_bounded_m": 3.25,
   "window_m": [
    174.0,
    199.0
   ],
   "width_at_max25_m": 3.0,
   "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": 18,
    "stations_resolved": 18,
    "width_median_m": 3.0,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 9.0,
    "bounded_share": 0.889,
    "unbounded_share": 0.111,
    "confidence_median": 1.0,
    "width_median_bounded_m": 2.75,
    "window_m": [
     174.0,
     199.0
    ],
    "width_at_max25_m": 2.0,
    "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": "Sassenage",
  "county": "Is\u00e8re",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}