{
 "ocl_version": "0.1.0",
 "name": "Sterling Hill Road",
 "slug": "sterling-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.173920278120022,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 380.0,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 285.78129179557635,
   "min_gradient_pct": 0.20926067224138478
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.031163272885276,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 286.0387482882005,
   "min_gradient_pct": 0.47042219479370334
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.46142706396381,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 383.0,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 286.53088474321214,
   "min_gradient_pct": 0.6373187375072575
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.049456537617516,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 376.0,
   "end_distance_m": 386.0,
   "start_elevation_m": 284.76895218428865,
   "end_elevation_m": 287.2738978380504,
   "min_gradient_pct": 0.756325176455448
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.06101600145803,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 368.0,
   "end_distance_m": 388.0,
   "start_elevation_m": 282.93192023822405,
   "end_elevation_m": 287.74412343851566,
   "min_gradient_pct": 0.8142413695722439
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.58599417682558,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 364.0,
   "end_distance_m": 389.0,
   "start_elevation_m": 282.0615624905097,
   "end_elevation_m": 287.9580610347161,
   "min_gradient_pct": 0.8844132674062166
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.11534006421323,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 340.0,
   "end_distance_m": 390.0,
   "start_elevation_m": 277.10776744962857,
   "end_elevation_m": 288.1654374817352,
   "min_gradient_pct": 1.55004123117385
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.555501793712324,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 291.0,
   "end_distance_m": 391.0,
   "start_elevation_m": 267.79899468796066,
   "end_elevation_m": 288.354496481673,
   "min_gradient_pct": 2.4057367272693
  }
 ],
 "shape": {
  "ascent_concentration": 0.361,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 304.0,
  "shape_class": "sustained"
 },
 "length_m": 904.0765983357526,
 "start_elevation_m": 232.9898132293775,
 "end_elevation_m": 342.06311884479493,
 "endpoint_gain_m": 109.07330561541744,
 "overall_gradient_pct": 12.064608885596906,
 "accumulated_ascent_m": 109.07595625157956,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.46142706396381,
   "start_distance_m": 378.0,
   "end_distance_m": 383.0,
   "midpoint_distance_m": 380.5,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 286.53088474321214,
   "start_xy": [
    699931.9298434122,
    4894164.289397771
   ],
   "end_xy": [
    699936.907441176,
    4894163.816618222
   ]
  },
  "max_10m": {
   "gradient_pct": 25.049456537617516,
   "start_distance_m": 376.0,
   "end_distance_m": 386.0,
   "midpoint_distance_m": 381.0,
   "start_elevation_m": 284.76895218428865,
   "end_elevation_m": 287.2738978380504,
   "start_xy": [
    699929.9388043067,
    4894164.47850959
   ],
   "end_xy": [
    699939.8939998343,
    4894163.532950493
   ]
  },
  "max_20m": {
   "gradient_pct": 24.06101600145803,
   "start_distance_m": 368.0,
   "end_distance_m": 388.0,
   "midpoint_distance_m": 378.0,
   "start_elevation_m": 282.93192023822405,
   "end_elevation_m": 287.74412343851566,
   "start_xy": [
    699921.9746478846,
    4894165.234956868
   ],
   "end_xy": [
    699941.8776004704,
    4894163.3113077795
   ]
  },
  "max_25m": {
   "gradient_pct": 23.58599417682558,
   "start_distance_m": 364.0,
   "end_distance_m": 389.0,
   "midpoint_distance_m": 376.5,
   "start_elevation_m": 282.0615624905097,
   "end_elevation_m": 287.9580610347161,
   "start_xy": [
    699917.9925696736,
    4894165.613180507
   ],
   "end_xy": [
    699942.815284948,
    4894162.963819909
   ]
  },
  "max_50m": {
   "gradient_pct": 22.11534006421323,
   "start_distance_m": 340.0,
   "end_distance_m": 390.0,
   "midpoint_distance_m": 365.0,
   "start_elevation_m": 277.10776744962857,
   "end_elevation_m": 288.1654374817352,
   "start_xy": [
    699894.1001004074,
    4894167.882522342
   ],
   "end_xy": [
    699943.7529694254,
    4894162.616332037
   ]
  },
  "max_100m": {
   "gradient_pct": 20.555501793712324,
   "start_distance_m": 291.0,
   "end_distance_m": 391.0,
   "midpoint_distance_m": 341.0,
   "start_elevation_m": 267.79899468796066,
   "end_elevation_m": 288.354496481673,
   "start_xy": [
    699848.6056707718,
    4894184.302483732
   ],
   "end_xy": [
    699944.6906539028,
    4894162.268844166
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 0.6373187375072575,
   "start_distance_m": 884.0,
   "end_distance_m": 889.0,
   "midpoint_distance_m": 886.5,
   "start_elevation_m": 341.8924874833085,
   "end_elevation_m": 341.9243534201839,
   "start_xy": [
    700352.1291487905,
    4893912.517933359
   ],
   "end_xy": [
    700356.6004867406,
    4893910.280270084
   ]
  },
  "min_10m": {
   "gradient_pct": 0.756325176455448,
   "start_distance_m": 885.0,
   "end_distance_m": 895.0,
   "midpoint_distance_m": 890.0,
   "start_elevation_m": 341.9014669402552,
   "end_elevation_m": 341.97709945790075,
   "start_xy": [
    700353.0234163805,
    4893912.070400705
   ],
   "end_xy": [
    700361.9660922807,
    4893907.595074153
   ]
  },
  "min_20m": {
   "gradient_pct": 0.8142413695722439,
   "start_distance_m": 879.0,
   "end_distance_m": 899.0,
   "midpoint_distance_m": 889.0,
   "start_elevation_m": 341.8411790009715,
   "end_elevation_m": 342.00402727488597,
   "start_xy": [
    700347.6578108404,
    4893914.755596636
   ],
   "end_xy": [
    700365.5431626408,
    4893905.804943533
   ]
  },
  "min_25m": {
   "gradient_pct": 0.8844132674062166,
   "start_distance_m": 879.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 891.5,
   "start_elevation_m": 341.8411790009715,
   "end_elevation_m": 342.0622823178231,
   "start_xy": [
    700347.6578108404,
    4893914.755596636
   ],
   "end_xy": [
    700370.0145005909,
    4893903.567280256
   ]
  },
  "min_50m": {
   "gradient_pct": 1.55004123117385,
   "start_distance_m": 854.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 879.0,
   "start_elevation_m": 341.28726170223615,
   "end_elevation_m": 342.0622823178231,
   "start_xy": [
    700325.3011210898,
    4893925.943913015
   ],
   "end_xy": [
    700370.0145005909,
    4893903.567280256
   ]
  },
  "min_100m": {
   "gradient_pct": 2.4057367272693,
   "start_distance_m": 804.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 854.0,
   "start_elevation_m": 339.6565455905538,
   "end_elevation_m": 342.0622823178231,
   "start_xy": [
    700280.5518740121,
    4893948.2483397825
   ],
   "end_xy": [
    700370.0145005909,
    4893903.567280256
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.173920278120022,
   "start_distance_m": 378.0,
   "end_distance_m": 380.0,
   "midpoint_distance_m": 379.0,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 285.78129179557635,
   "start_xy": [
    699931.9298434122,
    4894164.289397771
   ],
   "end_xy": [
    699933.9208825178,
    4894164.100285951
   ]
  },
  "max_3m": {
   "gradient_pct": 26.031163272885276,
   "start_distance_m": 378.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 379.5,
   "start_elevation_m": 285.25781339001395,
   "end_elevation_m": 286.0387482882005,
   "start_xy": [
    699931.9298434122,
    4894164.289397771
   ],
   "end_xy": [
    699934.9164020706,
    4894164.005730041
   ]
  }
 },
 "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": 0.104,
   "obstruction_max_height_m": 23.38,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x69y490_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x70y490_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-24T20:53:19+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-vt-1-260824",
  "elevation_provider": "USGS 3DEP (The National Map)",
  "elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
  "elevation_dataset": "USGS 3DEP 1 m DEM, VT_Statewide_A23 (collected 2023)",
  "elevation_tile_ids": [
   "x69y490",
   "x70y490"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.8% over 200 m (Terrain 50), gain 47.8 m over 313 m way. EXTENDED by graph walk: +2 segment(s) at base, +4 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): sterling-hill-road-2 ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_2_A23",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Barre",
  "county": "Vermont"
 }
}