{
 "ocl_version": "0.1.0",
 "name": "South Hill Road",
 "slug": "south-hill-road-3",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.16619671762794,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 775.0,
   "end_distance_m": 777.0,
   "start_elevation_m": 362.50089421420813,
   "end_elevation_m": 363.4642181485607,
   "min_gradient_pct": -44.559090666706425
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 46.56315082419269,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 775.0,
   "end_distance_m": 778.0,
   "start_elevation_m": 362.50089421420813,
   "end_elevation_m": 363.8977887389339,
   "min_gradient_pct": -37.35996365379227
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 43.350341856197474,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 774.0,
   "end_distance_m": 779.0,
   "start_elevation_m": 362.1207242588593,
   "end_elevation_m": 364.28824135166917,
   "min_gradient_pct": -21.339005441240033
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 36.61251546018491,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 771.0,
   "end_distance_m": 781.0,
   "start_elevation_m": 361.33335904912093,
   "end_elevation_m": 364.9946105951394,
   "min_gradient_pct": -2.1315444266241457
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.577098127940474,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 761.0,
   "end_distance_m": 781.0,
   "start_elevation_m": 359.4791909695513,
   "end_elevation_m": 364.9946105951394,
   "min_gradient_pct": 2.73471127955645
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.850796972347553,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 757.0,
   "end_distance_m": 782.0,
   "start_elevation_m": 358.8520551291447,
   "end_elevation_m": 365.06475437223156,
   "min_gradient_pct": 2.7476132343906556
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.12874531298212,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 731.0,
   "end_distance_m": 781.0,
   "start_elevation_m": 355.43023793864836,
   "end_elevation_m": 364.9946105951394,
   "min_gradient_pct": 3.0021363540500943
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.1213822160027,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 693.0,
   "end_distance_m": 793.0,
   "start_elevation_m": 350.1916882309496,
   "end_elevation_m": 366.3130704469523,
   "min_gradient_pct": 3.1344974506980066
  }
 ],
 "shape": {
  "ascent_concentration": 0.392,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 103.0,
  "shape_class": "sustained"
 },
 "length_m": 1021.1630197408596,
 "start_elevation_m": 301.1791484064895,
 "end_elevation_m": 395.59177965011844,
 "endpoint_gain_m": 94.41263124362894,
 "overall_gradient_pct": 9.24559834409084,
 "accumulated_ascent_m": 96.35428213022414,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 43.350341856197474,
   "start_distance_m": 774.0,
   "end_distance_m": 779.0,
   "midpoint_distance_m": 776.5,
   "start_elevation_m": 362.1207242588593,
   "end_elevation_m": 364.28824135166917,
   "start_xy": [
    676084.1881843506,
    4844495.771122307
   ],
   "end_xy": [
    676087.988379389,
    4844492.534107523
   ]
  },
  "max_10m": {
   "gradient_pct": 36.61251546018491,
   "start_distance_m": 771.0,
   "end_distance_m": 781.0,
   "midpoint_distance_m": 776.0,
   "start_elevation_m": 361.33335904912093,
   "end_elevation_m": 364.9946105951394,
   "start_xy": [
    676082.0282232297,
    4844497.8530848315
   ],
   "end_xy": [
    676089.591374309,
    4844491.338111315
   ]
  },
  "max_20m": {
   "gradient_pct": 27.577098127940474,
   "start_distance_m": 761.0,
   "end_distance_m": 781.0,
   "midpoint_distance_m": 771.0,
   "start_elevation_m": 359.4791909695513,
   "end_elevation_m": 364.9946105951394,
   "start_xy": [
    676075.180994114,
    4844505.139410153
   ],
   "end_xy": [
    676089.591374309,
    4844491.338111315
   ]
  },
  "max_25m": {
   "gradient_pct": 24.850796972347553,
   "start_distance_m": 757.0,
   "end_distance_m": 782.0,
   "midpoint_distance_m": 769.5,
   "start_elevation_m": 358.8520551291447,
   "end_elevation_m": 365.06475437223156,
   "start_xy": [
    676072.456952467,
    4844508.068504837
   ],
   "end_xy": [
    676090.3927115025,
    4844490.739898406
   ]
  },
  "max_50m": {
   "gradient_pct": 19.12874531298212,
   "start_distance_m": 731.0,
   "end_distance_m": 781.0,
   "midpoint_distance_m": 756.0,
   "start_elevation_m": 355.43023793864836,
   "end_elevation_m": 364.9946105951394,
   "start_xy": [
    676054.7528398378,
    4844527.109625901
   ],
   "end_xy": [
    676089.591374309,
    4844491.338111315
   ]
  },
  "max_100m": {
   "gradient_pct": 16.1213822160027,
   "start_distance_m": 693.0,
   "end_distance_m": 793.0,
   "midpoint_distance_m": 743.0,
   "start_elevation_m": 350.1916882309496,
   "end_elevation_m": 366.3130704469523,
   "start_xy": [
    676026.6947030899,
    4844552.454151822
   ],
   "end_xy": [
    676100.2730077177,
    4844485.979630058
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.339005441240033,
   "start_distance_m": 793.0,
   "end_distance_m": 798.0,
   "midpoint_distance_m": 795.5,
   "start_elevation_m": 366.3130704469523,
   "end_elevation_m": 365.2461201748903,
   "start_xy": [
    676100.2730077177,
    4844485.979630058
   ],
   "end_xy": [
    676105.1138994389,
    4844484.770591951
   ]
  },
  "min_10m": {
   "gradient_pct": -2.1315444266241457,
   "start_distance_m": 788.0,
   "end_distance_m": 798.0,
   "midpoint_distance_m": 793.0,
   "start_elevation_m": 365.4592746175527,
   "end_elevation_m": 365.2461201748903,
   "start_xy": [
    676095.6343376177,
    4844487.841616538
   ],
   "end_xy": [
    676105.1138994389,
    4844484.770591951
   ]
  },
  "min_20m": {
   "gradient_pct": 2.73471127955645,
   "start_distance_m": 301.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 322.9136384719334,
   "end_elevation_m": 323.4605807278447,
   "start_xy": [
    675720.5200152601,
    4844771.165421212
   ],
   "end_xy": [
    675730.02702964,
    4844753.582733719
   ]
  },
  "min_25m": {
   "gradient_pct": 2.7476132343906556,
   "start_distance_m": 301.0,
   "end_distance_m": 326.0,
   "midpoint_distance_m": 313.5,
   "start_elevation_m": 322.9136384719334,
   "end_elevation_m": 323.60054178053105,
   "start_xy": [
    675720.5200152601,
    4844771.165421212
   ],
   "end_xy": [
    675732.605800157,
    4844749.299051002
   ]
  },
  "min_50m": {
   "gradient_pct": 3.0021363540500943,
   "start_distance_m": 285.0,
   "end_distance_m": 335.0,
   "midpoint_distance_m": 310.0,
   "start_elevation_m": 322.4041602930452,
   "end_elevation_m": 323.90522847007026,
   "start_xy": [
    675713.2819323199,
    4844785.434622352
   ],
   "end_xy": [
    675737.2457144655,
    4844741.587295383
   ]
  },
  "min_100m": {
   "gradient_pct": 3.1344974506980066,
   "start_distance_m": 285.0,
   "end_distance_m": 385.0,
   "midpoint_distance_m": 335.0,
   "start_elevation_m": 322.4041602930452,
   "end_elevation_m": 325.5386577437432,
   "start_xy": [
    675713.2819323199,
    4844785.434622352
   ],
   "end_xy": [
    675766.0775720096,
    4844700.802733524
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.16619671762794,
   "start_distance_m": 775.0,
   "end_distance_m": 777.0,
   "midpoint_distance_m": 776.0,
   "start_elevation_m": 362.50089421420813,
   "end_elevation_m": 363.4642181485607,
   "start_xy": [
    676084.9081713909,
    4844495.077134798
   ],
   "end_xy": [
    676086.3853844687,
    4844493.73010373
   ]
  },
  "max_3m": {
   "gradient_pct": 46.56315082419269,
   "start_distance_m": 775.0,
   "end_distance_m": 778.0,
   "midpoint_distance_m": 776.5,
   "start_elevation_m": 362.50089421420813,
   "end_elevation_m": 363.8977887389339,
   "start_xy": [
    676084.9081713909,
    4844495.077134798
   ],
   "end_xy": [
    676087.1867216667,
    4844493.131890827
   ]
  }
 },
 "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": [
   "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x67y485_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-03T22:35:25+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": "canopy-tail-260903",
  "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": [
   "x67y485"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: VT_Statewide_2_A23: no corridor points fetched; VT_Statewide_1_A23: no EPT nodes intersect the corridor",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Pittsfield",
  "county": "Vermont"
 }
}