{
 "ocl_version": "0.1.0",
 "name": "Impasse Sansaret",
 "slug": "impasse-sansaret",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.498993465364265,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 7.0,
   "end_distance_m": 9.0,
   "start_elevation_m": 668.1414037673535,
   "end_elevation_m": 668.7313836366608,
   "min_gradient_pct": -1.1291264557712566
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.616287371520837,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 7.0,
   "end_distance_m": 10.0,
   "start_elevation_m": 668.1414037673535,
   "end_elevation_m": 668.9998923884991,
   "min_gradient_pct": -0.9688465983648106
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.432761179443787,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 333.0,
   "end_distance_m": 338.0,
   "start_elevation_m": 712.1953363926681,
   "end_elevation_m": 713.4169744516403,
   "min_gradient_pct": 1.2292275014829102
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.256602740169683,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 333.0,
   "end_distance_m": 343.0,
   "start_elevation_m": 712.1953363926681,
   "end_elevation_m": 714.520996666685,
   "min_gradient_pct": 3.111344345929865
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.74880089862029,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 323.0,
   "end_distance_m": 343.0,
   "start_elevation_m": 710.171236486961,
   "end_elevation_m": 714.520996666685,
   "min_gradient_pct": 4.405436817460782
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.26490067239274,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 325.0,
   "end_distance_m": 350.0,
   "start_elevation_m": 710.56165046863,
   "end_elevation_m": 715.8778756367282,
   "min_gradient_pct": 4.85080690799532
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.055721989917174,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 300.0,
   "end_distance_m": 350.0,
   "start_elevation_m": 705.8500146417696,
   "end_elevation_m": 715.8778756367282,
   "min_gradient_pct": 5.445103903334029
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.834016722110846,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 255.0,
   "end_distance_m": 355.0,
   "start_elevation_m": 697.8984978790502,
   "end_elevation_m": 716.732514601161,
   "min_gradient_pct": 8.147920701759176
  }
 ],
 "shape": {
  "ascent_concentration": 0.336,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 309.0,
  "shape_class": "sustained"
 },
 "length_m": 391.97152198924647,
 "start_elevation_m": 667.7233058398438,
 "end_elevation_m": 722.9214207275616,
 "endpoint_gain_m": 55.19811488771779,
 "overall_gradient_pct": 14.082174798717169,
 "accumulated_ascent_m": 55.237939585114646,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.432761179443787,
   "start_distance_m": 333.0,
   "end_distance_m": 338.0,
   "midpoint_distance_m": 335.5,
   "start_elevation_m": 712.1953363926681,
   "end_elevation_m": 713.4169744516403,
   "start_xy": [
    923087.3728776558,
    6455733.478804202
   ],
   "end_xy": [
    923091.5812148594,
    6455736.178785309
   ]
  },
  "max_10m": {
   "gradient_pct": 23.256602740169683,
   "start_distance_m": 333.0,
   "end_distance_m": 343.0,
   "midpoint_distance_m": 338.0,
   "start_elevation_m": 712.1953363926681,
   "end_elevation_m": 714.520996666685,
   "start_xy": [
    923087.3728776558,
    6455733.478804202
   ],
   "end_xy": [
    923095.789552063,
    6455738.878766417
   ]
  },
  "max_20m": {
   "gradient_pct": 21.74880089862029,
   "start_distance_m": 323.0,
   "end_distance_m": 343.0,
   "midpoint_distance_m": 333.0,
   "start_elevation_m": 710.171236486961,
   "end_elevation_m": 714.520996666685,
   "start_xy": [
    923078.9562032486,
    6455728.078841986
   ],
   "end_xy": [
    923095.789552063,
    6455738.878766417
   ]
  },
  "max_25m": {
   "gradient_pct": 21.26490067239274,
   "start_distance_m": 325.0,
   "end_distance_m": 350.0,
   "midpoint_distance_m": 337.5,
   "start_elevation_m": 710.56165046863,
   "end_elevation_m": 715.8778756367282,
   "start_xy": [
    923080.63953813,
    6455729.158834429
   ],
   "end_xy": [
    923101.681224148,
    6455742.658739967
   ]
  },
  "max_50m": {
   "gradient_pct": 20.055721989917174,
   "start_distance_m": 300.0,
   "end_distance_m": 350.0,
   "midpoint_distance_m": 325.0,
   "start_elevation_m": 705.8500146417696,
   "end_elevation_m": 715.8778756367282,
   "start_xy": [
    923059.9403611368,
    6455715.15094456
   ],
   "end_xy": [
    923101.681224148,
    6455742.658739967
   ]
  },
  "max_100m": {
   "gradient_pct": 18.834016722110846,
   "start_distance_m": 255.0,
   "end_distance_m": 355.0,
   "midpoint_distance_m": 305.0,
   "start_elevation_m": 697.8984978790502,
   "end_elevation_m": 716.732514601161,
   "start_xy": [
    923023.4971880884,
    6455688.758068878
   ],
   "end_xy": [
    923105.389728429,
    6455745.975052013
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 1.2292275014829102,
   "start_distance_m": 30.0,
   "end_distance_m": 35.0,
   "midpoint_distance_m": 32.5,
   "start_elevation_m": 671.1594469246816,
   "end_elevation_m": 671.2209082997557,
   "start_xy": [
    922835.8859469638,
    6455611.553253561
   ],
   "end_xy": [
    922839.8932987006,
    6455612.9281218825
   ]
  },
  "min_10m": {
   "gradient_pct": 3.111344345929865,
   "start_distance_m": 71.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 673.629135111002,
   "end_elevation_m": 673.940269545595,
   "start_xy": [
    922869.9470211825,
    6455593.116187226
   ],
   "end_xy": [
    922878.498907066,
    6455593.428892567
   ]
  },
  "min_20m": {
   "gradient_pct": 4.405436817460782,
   "start_distance_m": 61.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 71.0,
   "start_elevation_m": 673.0591821821029,
   "end_elevation_m": 673.940269545595,
   "start_xy": [
    922861.6806950415,
    6455598.743606895
   ],
   "end_xy": [
    922878.498907066,
    6455593.428892567
   ]
  },
  "min_25m": {
   "gradient_pct": 4.85080690799532,
   "start_distance_m": 56.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 68.5,
   "start_elevation_m": 672.7275678185962,
   "end_elevation_m": 673.940269545595,
   "start_xy": [
    922857.500102219,
    6455601.485650714
   ],
   "end_xy": [
    922878.498907066,
    6455593.428892567
   ]
  },
  "min_50m": {
   "gradient_pct": 5.445103903334029,
   "start_distance_m": 30.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 55.0,
   "start_elevation_m": 671.1594469246816,
   "end_elevation_m": 673.8819988763486,
   "start_xy": [
    922835.8859469638,
    6455611.553253561
   ],
   "end_xy": [
    922877.6160012063,
    6455592.959364954
   ]
  },
  "min_100m": {
   "gradient_pct": 8.147920701759176,
   "start_distance_m": 11.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 61.0,
   "start_elevation_m": 669.1486814342404,
   "end_elevation_m": 677.2966021359996,
   "start_xy": [
    922820.704725999,
    6455600.1324705705
   ],
   "end_xy": [
    922905.0053948497,
    6455607.479020871
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.498993465364265,
   "start_distance_m": 7.0,
   "end_distance_m": 9.0,
   "midpoint_distance_m": 8.0,
   "start_elevation_m": 668.1414037673535,
   "end_elevation_m": 668.7313836366608,
   "start_xy": [
    922817.428708745,
    6455597.837321131
   ],
   "end_xy": [
    922819.066717372,
    6455598.9848958505
   ]
  },
  "max_3m": {
   "gradient_pct": 28.616287371520837,
   "start_distance_m": 7.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 8.5,
   "start_elevation_m": 668.1414037673535,
   "end_elevation_m": 668.9998923884991,
   "start_xy": [
    922817.428708745,
    6455597.837321131
   ],
   "end_xy": [
    922819.8857216855,
    6455599.55868321
   ]
  }
 },
 "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": 0.244,
   "obstruction_max_height_m": 20.09,
   "flagged_windows_m": [
    2,
    3,
    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_E922-N6455_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E923-N6455_0m5.tif"
  ],
  "calculated_at": "2026-09-17T04:31:03+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": [
   "E922-N6455",
   "E923-N6455"
  ],
  "elevation_blocks": [
   "21LHD6PM@2025-03-25"
  ],
  "ign_dalles": [
   "LHD_FXX_0922_6456_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0923_6456_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6PM"
  ],
  "ign_editions": [
   "2025-03-25"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0922_6456_MNT_O_0M50_LAMB93_IGN69": "2025-03-25",
   "LHD_FXX_0923_6456_MNT_O_0M50_LAMB93_IGN69": "2025-03-25"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 20,
   "stations_resolved": 20,
   "width_median_m": 4.88,
   "width_p10_m": 2.48,
   "width_min_m": 2.25,
   "width_max_m": 11.25,
   "bounded_share": 0.0,
   "unbounded_share": 1.0,
   "confidence_median": 0.0,
   "window_m": [
    325.0,
    350.0
   ],
   "width_at_max25_m": 3.5,
   "window_stations": 6,
   "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": 20,
    "stations_resolved": 20,
    "width_median_m": 5.38,
    "width_p10_m": 1.95,
    "width_min_m": 1.25,
    "width_max_m": 12.0,
    "bounded_share": 0.7,
    "unbounded_share": 0.3,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.25,
    "window_m": [
     325.0,
     350.0
    ],
    "width_at_max25_m": 7.75,
    "window_stations": 6,
    "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": "Saint-Martin-d'Uriage",
  "county": "Is\u00e8re",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}