{
 "ocl_version": "0.1.0",
 "name": "Streeter Hill Road",
 "slug": "streeter-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.474472693789266,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2982.0,
   "end_distance_m": 2984.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 648.8119392458566,
   "min_gradient_pct": -9.807322773880855
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.96123656999801,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2982.0,
   "end_distance_m": 2985.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 649.0612868890807,
   "min_gradient_pct": -9.464298211226682
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.343800204118907,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2982.0,
   "end_distance_m": 2987.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 649.5896398021868,
   "min_gradient_pct": -9.083337555201751
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.06754427620558,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2982.0,
   "end_distance_m": 2992.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 650.8292042196014,
   "min_gradient_pct": -8.187057466667511
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.111405048799156,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2972.0,
   "end_distance_m": 2992.0,
   "start_elevation_m": 646.2069232098415,
   "end_elevation_m": 650.8292042196014,
   "min_gradient_pct": -7.389596247257373
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.84114861971193,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2971.0,
   "end_distance_m": 2996.0,
   "start_elevation_m": 646.0379862567709,
   "end_elevation_m": 651.4982734116988,
   "min_gradient_pct": -6.916061507358108
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.35418823480518,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2944.0,
   "end_distance_m": 2994.0,
   "start_elevation_m": 641.5249410765114,
   "end_elevation_m": 651.202035193914,
   "min_gradient_pct": -5.84443161467766
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.60668430948226,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2899.0,
   "end_distance_m": 2999.0,
   "start_elevation_m": 635.2930564500012,
   "end_elevation_m": 651.8997407594835,
   "min_gradient_pct": -5.329753186267112
  }
 ],
 "shape": {
  "ascent_concentration": 0.42,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 172.0,
  "shape_class": "sustained"
 },
 "length_m": 3235.5536361760974,
 "start_elevation_m": 516.9202895595904,
 "end_elevation_m": 663.1713500802042,
 "endpoint_gain_m": 146.2510605206138,
 "overall_gradient_pct": 4.520124744198615,
 "accumulated_ascent_m": 161.04571998644013,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.343800204118907,
   "start_distance_m": 2982.0,
   "end_distance_m": 2987.0,
   "midpoint_distance_m": 2984.5,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 649.5896398021868,
   "start_xy": [
    674221.1919037476,
    4736407.0755272955
   ],
   "end_xy": [
    674222.5217189619,
    4736402.255611166
   ]
  },
  "max_10m": {
   "gradient_pct": 26.06754427620558,
   "start_distance_m": 2982.0,
   "end_distance_m": 2992.0,
   "midpoint_distance_m": 2987.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 650.8292042196014,
   "start_xy": [
    674221.1919037476,
    4736407.0755272955
   ],
   "end_xy": [
    674223.8515341763,
    4736397.435695036
   ]
  },
  "max_20m": {
   "gradient_pct": 23.111405048799156,
   "start_distance_m": 2972.0,
   "end_distance_m": 2992.0,
   "midpoint_distance_m": 2982.0,
   "start_elevation_m": 646.2069232098415,
   "end_elevation_m": 650.8292042196014,
   "start_xy": [
    674218.4137841827,
    4736416.680667106
   ],
   "end_xy": [
    674223.8515341763,
    4736397.435695036
   ]
  },
  "max_25m": {
   "gradient_pct": 21.84114861971193,
   "start_distance_m": 2971.0,
   "end_distance_m": 2996.0,
   "midpoint_distance_m": 2983.5,
   "start_elevation_m": 646.0379862567709,
   "end_elevation_m": 651.4982734116988,
   "start_xy": [
    674218.1178288196,
    4736417.635868877
   ],
   "end_xy": [
    674224.2952235057,
    4736393.474703862
   ]
  },
  "max_50m": {
   "gradient_pct": 19.35418823480518,
   "start_distance_m": 2944.0,
   "end_distance_m": 2994.0,
   "midpoint_distance_m": 2969.0,
   "start_elevation_m": 641.5249410765114,
   "end_elevation_m": 651.202035193914,
   "start_xy": [
    674212.1016806664,
    4736443.868997539
   ],
   "end_xy": [
    674224.1624821282,
    4736395.470293932
   ]
  },
  "max_100m": {
   "gradient_pct": 16.60668430948226,
   "start_distance_m": 2899.0,
   "end_distance_m": 2999.0,
   "midpoint_distance_m": 2949.0,
   "start_elevation_m": 635.2930564500012,
   "end_elevation_m": 651.8997407594835,
   "start_xy": [
    674210.4446056559,
    4736488.807487322
   ],
   "end_xy": [
    674224.494335572,
    4736390.481318758
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.083337555201751,
   "start_distance_m": 95.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 97.5,
   "start_elevation_m": 512.0555829189523,
   "end_elevation_m": 511.6014160411922,
   "start_xy": [
    673392.2107468859,
    4737823.263831606
   ],
   "end_xy": [
    673397.1902181826,
    4737822.915241559
   ]
  },
  "min_10m": {
   "gradient_pct": -8.187057466667511,
   "start_distance_m": 93.0,
   "end_distance_m": 103.0,
   "midpoint_distance_m": 98.0,
   "start_elevation_m": 512.1895157745898,
   "end_elevation_m": 511.3708100279231,
   "start_xy": [
    673390.2158168496,
    4737823.12151453
   ],
   "end_xy": [
    673400.1771094296,
    4737822.635097526
   ]
  },
  "min_20m": {
   "gradient_pct": -7.389596247257373,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 516.9202895595904,
   "end_elevation_m": 515.4423703101389,
   "start_xy": [
    673298.516,
    4737807.942
   ],
   "end_xy": [
    673318.2456212364,
    4737811.219506043
   ]
  },
  "min_25m": {
   "gradient_pct": -6.916061507358108,
   "start_distance_m": 80.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 92.5,
   "start_elevation_m": 512.9816293936867,
   "end_elevation_m": 511.2526140168472,
   "start_xy": [
    673377.307852122,
    4737821.752222895
   ],
   "end_xy": [
    673402.1683702609,
    4737822.448334838
   ]
  },
  "min_50m": {
   "gradient_pct": -5.84443161467766,
   "start_distance_m": 68.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 93.0,
   "start_elevation_m": 513.5150255590609,
   "end_elevation_m": 510.59280975172203,
   "start_xy": [
    673365.5311592013,
    4737819.447986828
   ],
   "end_xy": [
    673414.9095311061,
    4737819.961837934
   ]
  },
  "min_100m": {
   "gradient_pct": -5.329753186267112,
   "start_distance_m": 2.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 52.0,
   "start_elevation_m": 516.7742273283463,
   "end_elevation_m": 511.44447414207923,
   "start_xy": [
    673300.4889621236,
    4737808.269750604
   ],
   "end_xy": [
    673399.181479014,
    4737822.72847887
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.474472693789266,
   "start_distance_m": 2982.0,
   "end_distance_m": 2984.0,
   "midpoint_distance_m": 2983.0,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 648.8119392458566,
   "start_xy": [
    674221.1919037476,
    4736407.0755272955
   ],
   "end_xy": [
    674221.7238298333,
    4736405.147560844
   ]
  },
  "max_3m": {
   "gradient_pct": 27.96123656999801,
   "start_distance_m": 2982.0,
   "end_distance_m": 2985.0,
   "midpoint_distance_m": 2983.5,
   "start_elevation_m": 648.2224497919808,
   "end_elevation_m": 649.0612868890807,
   "start_xy": [
    674221.1919037476,
    4736407.0755272955
   ],
   "end_xy": [
    674221.9897928762,
    4736404.183577618
   ]
  }
 },
 "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": {
  "review": [],
  "extent": [
   "descends_at_start"
  ]
 },
 "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_x67y474_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-24T23:47:05+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": [
   "x67y474"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.8% over 200 m (Terrain 50), gain 84.7 m over 1720 m way. EXTENDED by graph walk: +4 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_check": "unavailable \u2014 EPT corridor failed: VT_Statewide_2_A23: no EPT nodes intersect the corridor; VT_Statewide_1_A23: no EPT nodes intersect the corridor",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Whitingham",
  "county": "Vermont"
 }
}