{
 "ocl_version": "0.1.0",
 "name": "Chemin de la Grande Combe",
 "slug": "chemin-de-la-grande-combe",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.225364715034175,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 716.0,
   "end_distance_m": 718.0,
   "start_elevation_m": 953.3662325949064,
   "end_elevation_m": 954.210739889207,
   "min_gradient_pct": -26.496428438190378,
   "suppressed_max_gradient_pct": 102.5014578668845,
   "suppressed_location_m": [
    232.0,
    234.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.288696383367856,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 792.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 966.2155593939341,
   "min_gradient_pct": -23.28778999400356,
   "suppressed_max_gradient_pct": 85.10854593409931,
   "suppressed_location_m": [
    232.0,
    235.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.222012160033046,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 796.0,
   "end_distance_m": 801.0,
   "start_elevation_m": 966.8428750821311,
   "end_elevation_m": 968.4039756901327,
   "min_gradient_pct": -8.013480492015788,
   "suppressed_max_gradient_pct": 55.58364681881585,
   "suppressed_location_m": [
    232.0,
    237.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.89480443217576,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 799.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 967.8163789456506,
   "min_gradient_pct": 0.14535176710296582,
   "suppressed_max_gradient_pct": 33.26958713612839,
   "suppressed_location_m": [
    232.0,
    242.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.18932400004735,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 809.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 969.9647633024425,
   "min_gradient_pct": 2.96458088667066
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.736937240519183,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 814.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 970.8111328125628,
   "min_gradient_pct": 5.482572927238834
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.2888685322946,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 839.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 975.7713327685804,
   "min_gradient_pct": 8.979425436115207
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.115810095122015,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 889.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 985.2427085975551,
   "min_gradient_pct": 10.613190952777131
  }
 ],
 "shape": {
  "ascent_concentration": 0.315,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 394.0,
  "shape_class": "sustained"
 },
 "length_m": 1168.0441661420916,
 "start_elevation_m": 857.6041851171863,
 "end_elevation_m": 1028.9078341001684,
 "endpoint_gain_m": 171.30364898298217,
 "overall_gradient_pct": 14.665853736402568,
 "accumulated_ascent_m": 173.52234583538984,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.222012160033046,
   "start_distance_m": 796.0,
   "end_distance_m": 801.0,
   "midpoint_distance_m": 798.5,
   "start_elevation_m": 966.8428750821311,
   "end_elevation_m": 968.4039756901327,
   "start_xy": [
    904876.4827044837,
    6456517.391932849
   ],
   "end_xy": [
    904872.7105325375,
    6456520.673810178
   ]
  },
  "max_10m": {
   "gradient_pct": 26.89480443217576,
   "start_distance_m": 789.0,
   "end_distance_m": 799.0,
   "midpoint_distance_m": 794.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 967.8163789456506,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904874.219401316,
    6456519.361059247
   ]
  },
  "max_20m": {
   "gradient_pct": 24.18932400004735,
   "start_distance_m": 789.0,
   "end_distance_m": 809.0,
   "midpoint_distance_m": 799.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 969.9647633024425,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904866.6750574238,
    6456525.924813907
   ]
  },
  "max_25m": {
   "gradient_pct": 22.736937240519183,
   "start_distance_m": 789.0,
   "end_distance_m": 814.0,
   "midpoint_distance_m": 801.5,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 970.8111328125628,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904862.9028854778,
    6456529.206691236
   ]
  },
  "max_50m": {
   "gradient_pct": 21.2888685322946,
   "start_distance_m": 789.0,
   "end_distance_m": 839.0,
   "midpoint_distance_m": 814.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 975.7713327685804,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904842.1171822335,
    6456543.034585929
   ]
  },
  "max_100m": {
   "gradient_pct": 20.115810095122015,
   "start_distance_m": 789.0,
   "end_distance_m": 889.0,
   "midpoint_distance_m": 839.0,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 985.2427085975551,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904794.2094192305,
    6456556.237988601
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.013480492015788,
   "start_distance_m": 227.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 229.5,
   "start_elevation_m": 885.6755122641177,
   "end_elevation_m": 885.274838239517,
   "start_xy": [
    905398.6087702537,
    6456420.53956673
   ],
   "end_xy": [
    905393.6230474085,
    6456420.161985334
   ]
  },
  "min_10m": {
   "gradient_pct": 0.14535176710296582,
   "start_distance_m": 222.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 227.0,
   "start_elevation_m": 885.2603030628067,
   "end_elevation_m": 885.274838239517,
   "start_xy": [
    905403.5944930989,
    6456420.917148127
   ],
   "end_xy": [
    905393.6230474085,
    6456420.161985334
   ]
  },
  "min_20m": {
   "gradient_pct": 2.96458088667066,
   "start_distance_m": 212.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 222.0,
   "start_elevation_m": 884.6819220621828,
   "end_elevation_m": 885.274838239517,
   "start_xy": [
    905413.5659387892,
    6456421.67231092
   ],
   "end_xy": [
    905393.6230474085,
    6456420.161985334
   ]
  },
  "min_25m": {
   "gradient_pct": 5.482572927238834,
   "start_distance_m": 207.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 219.5,
   "start_elevation_m": 883.9041950077072,
   "end_elevation_m": 885.274838239517,
   "start_xy": [
    905418.5523104081,
    6456422.041196302
   ],
   "end_xy": [
    905393.6230474085,
    6456420.161985334
   ]
  },
  "min_50m": {
   "gradient_pct": 8.979425436115207,
   "start_distance_m": 623.0,
   "end_distance_m": 673.0,
   "midpoint_distance_m": 648.0,
   "start_elevation_m": 941.9102202728195,
   "end_elevation_m": 946.3999329908771,
   "start_xy": [
    905007.7220058087,
    6456407.731275962
   ],
   "end_xy": [
    904965.5270128944,
    6456432.813482582
   ]
  },
  "min_100m": {
   "gradient_pct": 10.613190952777131,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 857.6041851171863,
   "end_elevation_m": 868.2173760699634,
   "start_xy": [
    905616.666,
    6456387.16
   ],
   "end_xy": [
    905520.4384503798,
    6456400.035817822
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.225364715034175,
   "start_distance_m": 716.0,
   "end_distance_m": 718.0,
   "midpoint_distance_m": 717.0,
   "start_elevation_m": 953.3662325949064,
   "end_elevation_m": 954.210739889207,
   "start_xy": [
    904935.0151334521,
    6456463.010999068
   ],
   "end_xy": [
    904933.6746430956,
    6456464.495278558
   ]
  },
  "max_3m": {
   "gradient_pct": 36.288696383367856,
   "start_distance_m": 789.0,
   "end_distance_m": 792.0,
   "midpoint_distance_m": 790.5,
   "start_elevation_m": 965.126898502433,
   "end_elevation_m": 966.2155593939341,
   "start_xy": [
    904881.7637452082,
    6456512.7973045865
   ],
   "end_xy": [
    904879.5004420405,
    6456514.766430984
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.011,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.032,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.538,
   "obstruction_max_height_m": 27.45,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    210.0,
    240.0
   ],
   [
    686.0,
    691.0
   ]
  ],
  "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_E904-N6456_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E905-N6456_0m5.tif"
  ],
  "calculated_at": "2026-09-17T03:07:45+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": [
   "E904-N6456",
   "E905-N6456"
  ],
  "elevation_blocks": [
   "21LHD6PM@2025-03-25"
  ],
  "ign_dalles": [
   "LHD_FXX_0904_6457_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0905_6457_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6PM"
  ],
  "ign_editions": [
   "2025-03-25"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0904_6457_MNT_O_0M50_LAMB93_IGN69": "2025-03-25",
   "LHD_FXX_0905_6457_MNT_O_0M50_LAMB93_IGN69": "2025-03-25"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 53,
   "stations_resolved": 53,
   "width_median_m": 4.75,
   "width_p10_m": 2.8,
   "width_min_m": 2.0,
   "width_max_m": 12.0,
   "bounded_share": 0.415,
   "unbounded_share": 0.585,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.38,
   "window_m": [
    789.0,
    814.0
   ],
   "width_at_max25_m": 3.75,
   "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": 53,
    "stations_resolved": 53,
    "width_median_m": 2.0,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.906,
    "unbounded_share": 0.094,
    "confidence_median": 1.0,
    "width_median_bounded_m": 1.62,
    "window_m": [
     789.0,
     814.0
    ],
    "width_at_max25_m": 1.5,
    "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": "Engins",
  "county": "Is\u00e8re",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}