{
 "ocl_version": "0.1.0",
 "name": "West Hill Road",
 "slug": "west-hill-road-3",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.596499768351123,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 481.0,
   "end_distance_m": 483.0,
   "start_elevation_m": 443.32877737824913,
   "end_elevation_m": 443.86070737361615,
   "min_gradient_pct": -4.907797992251517
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.166575273850867,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 465.0,
   "end_distance_m": 468.0,
   "start_elevation_m": 439.2974064542834,
   "end_elevation_m": 440.08240371249894,
   "min_gradient_pct": -4.532993109383672
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.159999213589344,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 463.0,
   "end_distance_m": 468.0,
   "start_elevation_m": 438.7744037518195,
   "end_elevation_m": 440.08240371249894,
   "min_gradient_pct": -3.749955263846232
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.983398082003646,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 462.0,
   "end_distance_m": 472.0,
   "start_elevation_m": 438.51722552966555,
   "end_elevation_m": 441.1155653378659,
   "min_gradient_pct": -3.385963975761115
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.43151810898337,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 463.0,
   "end_distance_m": 483.0,
   "start_elevation_m": 438.7744037518195,
   "end_elevation_m": 443.86070737361615,
   "min_gradient_pct": -3.2260586828130045
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.062903022838555,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 460.0,
   "end_distance_m": 485.0,
   "start_elevation_m": 438.06473161018914,
   "end_elevation_m": 444.3304573658988,
   "min_gradient_pct": -3.048775848021023
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.791941080115976,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 443.0,
   "end_distance_m": 493.0,
   "start_elevation_m": 434.51782646363085,
   "end_elevation_m": 445.91379700368884,
   "min_gradient_pct": -2.285916700428629
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.132053192992544,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 385.0,
   "end_distance_m": 485.0,
   "start_elevation_m": 425.19840417290624,
   "end_elevation_m": 444.3304573658988,
   "min_gradient_pct": -0.5553759279060273
  }
 ],
 "shape": {
  "ascent_concentration": 0.464,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 193.0,
  "shape_class": "stepped"
 },
 "length_m": 506.2821481576011,
 "start_elevation_m": 395.3126654321304,
 "end_elevation_m": 447.9835702354611,
 "endpoint_gain_m": 52.6709048033307,
 "overall_gradient_pct": 10.403468697247986,
 "accumulated_ascent_m": 53.88344598126122,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.159999213589344,
   "start_distance_m": 463.0,
   "end_distance_m": 468.0,
   "midpoint_distance_m": 465.5,
   "start_elevation_m": 438.7744037518195,
   "end_elevation_m": 440.08240371249894,
   "start_xy": [
    673482.4219161987,
    4778754.932718712
   ],
   "end_xy": [
    673482.5859234812,
    4778749.935409661
   ]
  },
  "max_10m": {
   "gradient_pct": 25.983398082003646,
   "start_distance_m": 462.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 467.0,
   "start_elevation_m": 438.51722552966555,
   "end_elevation_m": 441.1155653378659,
   "start_xy": [
    673482.3889011735,
    4778755.932173568
   ],
   "end_xy": [
    673482.7179175939,
    4778745.937588061
   ]
  },
  "max_20m": {
   "gradient_pct": 25.43151810898337,
   "start_distance_m": 463.0,
   "end_distance_m": 483.0,
   "midpoint_distance_m": 473.0,
   "start_elevation_m": 438.7744037518195,
   "end_elevation_m": 443.86070737361615,
   "start_xy": [
    673482.4219161987,
    4778754.932718712
   ],
   "end_xy": [
    673483.0789200311,
    4778734.943514208
   ]
  },
  "max_25m": {
   "gradient_pct": 25.062903022838555,
   "start_distance_m": 460.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 472.5,
   "start_elevation_m": 438.06473161018914,
   "end_elevation_m": 444.3304573658988,
   "start_xy": [
    673482.32290412,
    4778757.931084367
   ],
   "end_xy": [
    673483.1386246727,
    4778732.944619719
   ]
  },
  "max_50m": {
   "gradient_pct": 22.791941080115976,
   "start_distance_m": 443.0,
   "end_distance_m": 493.0,
   "midpoint_distance_m": 468.0,
   "start_elevation_m": 434.51782646363085,
   "end_elevation_m": 445.91379700368884,
   "start_xy": [
    673481.7639105212,
    4778774.921890589
   ],
   "end_xy": [
    673481.9488043394,
    4778725.039987013
   ]
  },
  "max_100m": {
   "gradient_pct": 19.132053192992544,
   "start_distance_m": 385.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 435.0,
   "start_elevation_m": 425.19840417290624,
   "end_elevation_m": 444.3304573658988,
   "start_xy": [
    673482.3328837402,
    4778832.90182251
   ],
   "end_xy": [
    673483.1386246727,
    4778732.944619719
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.749955263846232,
   "start_distance_m": 99.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 101.5,
   "start_elevation_m": 398.74968917351504,
   "end_elevation_m": 398.5621914103227,
   "start_xy": [
    673312.5390911667,
    4779040.08839713
   ],
   "end_xy": [
    673314.9905507358,
    4779035.730606432
   ]
  },
  "min_10m": {
   "gradient_pct": -3.385963975761115,
   "start_distance_m": 94.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 99.0,
   "start_elevation_m": 398.90078780789884,
   "end_elevation_m": 398.5621914103227,
   "start_xy": [
    673310.0872963489,
    4779044.44599915
   ],
   "end_xy": [
    673314.9905507358,
    4779035.730606432
   ]
  },
  "min_20m": {
   "gradient_pct": -3.2260586828130045,
   "start_distance_m": 84.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 94.0,
   "start_elevation_m": 399.2074031468853,
   "end_elevation_m": 398.5621914103227,
   "start_xy": [
    673305.1833474623,
    4779053.161000734
   ],
   "end_xy": [
    673314.9905507358,
    4779035.730606432
   ]
  },
  "min_25m": {
   "gradient_pct": -3.048775848021023,
   "start_distance_m": 85.0,
   "end_distance_m": 110.0,
   "midpoint_distance_m": 97.5,
   "start_elevation_m": 399.18615785531443,
   "end_elevation_m": 398.4239638933092,
   "start_xy": [
    673305.6743760523,
    4779052.289857311
   ],
   "end_xy": [
    673318.2679307278,
    4779030.738927501
   ]
  },
  "min_50m": {
   "gradient_pct": -2.285916700428629,
   "start_distance_m": 77.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 102.0,
   "start_elevation_m": 399.2868469862185,
   "end_elevation_m": 398.1438886360042,
   "start_xy": [
    673301.7513372186,
    4779059.261926419
   ],
   "end_xy": [
    673329.8095491093,
    4779018.257300374
   ]
  },
  "min_100m": {
   "gradient_pct": -0.5553759279060273,
   "start_distance_m": 62.0,
   "end_distance_m": 162.0,
   "midpoint_distance_m": 112.0,
   "start_elevation_m": 399.1349896394922,
   "end_elevation_m": 398.57961371158615,
   "start_xy": [
    673292.7937523,
    4779071.0331288
   ],
   "end_xy": [
    673357.4219315898,
    4778996.988338108
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.596499768351123,
   "start_distance_m": 481.0,
   "end_distance_m": 483.0,
   "midpoint_distance_m": 482.0,
   "start_elevation_m": 443.32877737824913,
   "end_elevation_m": 443.86070737361615,
   "start_xy": [
    673483.0129229748,
    4778736.942425009
   ],
   "end_xy": [
    673483.0789200311,
    4778734.943514208
   ]
  },
  "max_3m": {
   "gradient_pct": 26.166575273850867,
   "start_distance_m": 465.0,
   "end_distance_m": 468.0,
   "midpoint_distance_m": 466.5,
   "start_elevation_m": 439.2974064542834,
   "end_elevation_m": 440.08240371249894,
   "start_xy": [
    673482.4878250636,
    4778752.933805043
   ],
   "end_xy": [
    673482.5859234812,
    4778749.935409661
   ]
  }
 },
 "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_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_x67y478_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-03T22:36:24+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": [
   "x67y478"
  ],
  "climb_origin": "discovered",
  "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"
 },
 "area": {
  "place": "Ludlow",
  "county": "Vermont"
 }
}