{
 "ocl_version": "0.1.0",
 "name": "Impasse des Rivoires",
 "slug": "impasse-des-rivoires",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.119700343359284,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 206.0,
   "end_distance_m": 208.0,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.2016305167153,
   "min_gradient_pct": 1.1453950304158411
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.004858157993112,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 206.0,
   "end_distance_m": 209.0,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.39938225458792,
   "min_gradient_pct": 1.2347958220563744
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.80221796919568,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 206.0,
   "end_distance_m": 211.0,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.8293474083079,
   "min_gradient_pct": 2.6481697004146554
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.20224515170662,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 201.0,
   "end_distance_m": 211.0,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 198.8293474083079,
   "min_gradient_pct": 5.366522944597705
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.429787070026748,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 201.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 200.7950803071426,
   "min_gradient_pct": 6.468572373393329
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.172756062661392,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 201.0,
   "end_distance_m": 226.0,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 201.7523119088026,
   "min_gradient_pct": 6.757136987706986
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.342871195177338,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 198.0,
   "end_distance_m": 248.0,
   "start_elevation_m": 196.22131952786398,
   "end_elevation_m": 205.39275512545265,
   "min_gradient_pct": 7.674470331703162
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.649386230037493,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 175.0,
   "end_distance_m": 275.0,
   "start_elevation_m": 193.21994868679005,
   "end_elevation_m": 209.86933491682754,
   "min_gradient_pct": 9.00694515067562
  }
 ],
 "shape": {
  "ascent_concentration": 0.344,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 195.0,
  "shape_class": "sustained"
 },
 "length_m": 275.92491887681894,
 "start_elevation_m": 174.401132963884,
 "end_elevation_m": 210.03260203517618,
 "endpoint_gain_m": 35.63146907129217,
 "overall_gradient_pct": 12.913465451519844,
 "accumulated_ascent_m": 35.63191908033201,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.80221796919568,
   "start_distance_m": 206.0,
   "end_distance_m": 211.0,
   "midpoint_distance_m": 208.5,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.8293474083079,
   "start_xy": [
    834982.7225426072,
    6480928.074519059
   ],
   "end_xy": [
    834977.7267868613,
    6480928.280491212
   ]
  },
  "max_10m": {
   "gradient_pct": 21.20224515170662,
   "start_distance_m": 201.0,
   "end_distance_m": 211.0,
   "midpoint_distance_m": 206.0,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 198.8293474083079,
   "start_xy": [
    834987.716309245,
    6480927.84359278
   ],
   "end_xy": [
    834977.7267868613,
    6480928.280491212
   ]
  },
  "max_20m": {
   "gradient_pct": 20.429787070026748,
   "start_distance_m": 201.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 211.0,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 200.7950803071426,
   "start_xy": [
    834987.716309245,
    6480927.84359278
   ],
   "end_xy": [
    834967.7333938391,
    6480928.604388292
   ]
  },
  "max_25m": {
   "gradient_pct": 20.172756062661392,
   "start_distance_m": 201.0,
   "end_distance_m": 226.0,
   "midpoint_distance_m": 213.5,
   "start_elevation_m": 196.70912289313725,
   "end_elevation_m": 201.7523119088026,
   "start_xy": [
    834987.716309245,
    6480927.84359278
   ],
   "end_xy": [
    834962.7333996649,
    6480928.612020927
   ]
  },
  "max_50m": {
   "gradient_pct": 18.342871195177338,
   "start_distance_m": 198.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 223.0,
   "start_elevation_m": 196.22131952786398,
   "end_elevation_m": 205.39275512545265,
   "start_xy": [
    834990.6954902776,
    6480927.490775016
   ],
   "end_xy": [
    834940.7431182017,
    6480928.3272980135
   ]
  },
  "max_100m": {
   "gradient_pct": 16.649386230037493,
   "start_distance_m": 175.0,
   "end_distance_m": 275.0,
   "midpoint_distance_m": 225.0,
   "start_elevation_m": 193.21994868679005,
   "end_elevation_m": 209.86933491682754,
   "start_xy": [
    835012.6525967952,
    6480931.523601598
   ],
   "end_xy": [
    834914.2249433891,
    6480923.627663311
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.6481697004146554,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 174.53354144890474,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835172.752007947,
    6480947.207550473
   ]
  },
  "min_10m": {
   "gradient_pct": 5.366522944597705,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 174.93778525834378,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835167.7520406146,
    6480947.189476321
   ]
  },
  "min_20m": {
   "gradient_pct": 6.468572373393329,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 175.69484743856268,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835157.9025538297,
    6480945.810325888
   ]
  },
  "min_25m": {
   "gradient_pct": 6.757136987706986,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 176.09041721081076,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835153.0225238685,
    6480944.721607569
   ]
  },
  "min_50m": {
   "gradient_pct": 7.674470331703162,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 178.2383681297356,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835128.6223740625,
    6480939.278015975
   ]
  },
  "min_100m": {
   "gradient_pct": 9.00694515067562,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 174.401132963884,
   "end_elevation_m": 183.40807811455963,
   "start_xy": [
    835177.57,
    6480945.928
   ],
   "end_xy": [
    835081.50971608,
    6480933.677157314
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.119700343359284,
   "start_distance_m": 206.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 207.0,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.2016305167153,
   "start_xy": [
    834982.7225426072,
    6480928.074519059
   ],
   "end_xy": [
    834980.7242403089,
    6480928.15690792
   ]
  },
  "max_3m": {
   "gradient_pct": 22.004858157993112,
   "start_distance_m": 206.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 207.5,
   "start_elevation_m": 197.73923650984813,
   "end_elevation_m": 198.39938225458792,
   "start_xy": [
    834982.7225426072,
    6480928.074519059
   ],
   "end_xy": [
    834979.7250891597,
    6480928.19810235
   ]
  }
 },
 "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": 0.051,
   "obstruction_max_height_m": 8.88,
   "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_E834-N6480_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E835-N6480_0m5.tif"
  ],
  "calculated_at": "2026-09-17T04:19:19+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": [
   "E834-N6480",
   "E835-N6480"
  ],
  "elevation_blocks": [
   "22LHD5NM@2025-02-27"
  ],
  "ign_dalles": [
   "LHD_FXX_0834_6481_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0835_6481_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD5NM"
  ],
  "ign_editions": [
   "2025-02-27"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0834_6481_MNT_O_0M50_LAMB93_IGN69": "2025-02-27",
   "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": 18,
   "stations_resolved": 18,
   "width_median_m": 4.0,
   "width_p10_m": 2.67,
   "width_min_m": 2.5,
   "width_max_m": 11.75,
   "bounded_share": 0.444,
   "unbounded_share": 0.556,
   "confidence_median": 0.0,
   "width_median_bounded_m": 2.75,
   "window_m": [
    201.0,
    226.0
   ],
   "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": 5.12,
    "width_p10_m": 3.03,
    "width_min_m": 2.25,
    "width_max_m": 12.0,
    "bounded_share": 0.667,
    "unbounded_share": 0.333,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.0,
    "window_m": [
     201.0,
     226.0
    ],
    "width_at_max25_m": 3.75,
    "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)"
 }
}