{
 "ocl_version": "0.1.0",
 "name": "Light Hill Road",
 "slug": "light-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.152615035415124,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 558.0,
   "end_distance_m": 560.0,
   "start_elevation_m": 146.4321122346833,
   "end_elevation_m": 146.8751645353916,
   "min_gradient_pct": -6.403923102661224
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.45635167736752,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 558.0,
   "end_distance_m": 561.0,
   "start_elevation_m": 146.4321122346833,
   "end_elevation_m": 147.07580278500433,
   "min_gradient_pct": -6.3366442473679285
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.17858151942073,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 554.0,
   "end_distance_m": 559.0,
   "start_elevation_m": 145.61495001470388,
   "end_elevation_m": 146.67387909067492,
   "min_gradient_pct": -5.110754897190191
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.756049815400388,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 549.0,
   "end_distance_m": 559.0,
   "start_elevation_m": 144.59827410913488,
   "end_elevation_m": 146.67387909067492,
   "min_gradient_pct": -3.689281619432734
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.28280325844804,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 544.0,
   "end_distance_m": 564.0,
   "start_elevation_m": 143.62387086274805,
   "end_elevation_m": 147.68043151443766,
   "min_gradient_pct": -1.9585509714787719
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.090153478894194,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 548.0,
   "end_distance_m": 573.0,
   "start_elevation_m": 144.40585401157486,
   "end_elevation_m": 149.4283923812984,
   "min_gradient_pct": -1.4564102731305866
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.513530933500647,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 536.0,
   "end_distance_m": 586.0,
   "start_elevation_m": 142.100927144762,
   "end_elevation_m": 151.85769261151233,
   "min_gradient_pct": -0.4262962143961033
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.177024099201788,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 514.0,
   "end_distance_m": 614.0,
   "start_elevation_m": 138.8092016030884,
   "end_elevation_m": 155.9862257022902,
   "min_gradient_pct": 0.060989450668031964
  }
 ],
 "shape": {
  "ascent_concentration": 0.434,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 310.0,
  "shape_class": "sustained"
 },
 "length_m": 959.4295579855325,
 "start_elevation_m": 115.07016011705892,
 "end_elevation_m": 201.4125898684227,
 "endpoint_gain_m": 86.3424297513638,
 "overall_gradient_pct": 8.99935060711,
 "accumulated_ascent_m": 87.16463499043616,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.17858151942073,
   "start_distance_m": 554.0,
   "end_distance_m": 559.0,
   "midpoint_distance_m": 556.5,
   "start_elevation_m": 145.61495001470388,
   "end_elevation_m": 146.67387909067492,
   "start_xy": [
    484034.87081523857,
    4900782.789282061
   ],
   "end_xy": [
    484030.55460402305,
    4900780.265332628
   ]
  },
  "max_10m": {
   "gradient_pct": 20.756049815400388,
   "start_distance_m": 549.0,
   "end_distance_m": 559.0,
   "midpoint_distance_m": 554.0,
   "start_elevation_m": 144.59827410913488,
   "end_elevation_m": 146.67387909067492,
   "start_xy": [
    484039.1870264541,
    4900785.313231494
   ],
   "end_xy": [
    484030.55460402305,
    4900780.265332628
   ]
  },
  "max_20m": {
   "gradient_pct": 20.28280325844804,
   "start_distance_m": 544.0,
   "end_distance_m": 564.0,
   "midpoint_distance_m": 554.0,
   "start_elevation_m": 143.62387086274805,
   "end_elevation_m": 147.68043151443766,
   "start_xy": [
    484043.5032376696,
    4900787.837180928
   ],
   "end_xy": [
    484026.23839280754,
    4900777.741383194
   ]
  },
  "max_25m": {
   "gradient_pct": 20.090153478894194,
   "start_distance_m": 548.0,
   "end_distance_m": 573.0,
   "midpoint_distance_m": 560.5,
   "start_elevation_m": 144.40585401157486,
   "end_elevation_m": 149.4283923812984,
   "start_xy": [
    484040.0502686972,
    4900785.818021381
   ],
   "end_xy": [
    484018.8855765563,
    4900772.568003637
   ]
  },
  "max_50m": {
   "gradient_pct": 19.513530933500647,
   "start_distance_m": 536.0,
   "end_distance_m": 586.0,
   "midpoint_distance_m": 561.0,
   "start_elevation_m": 142.100927144762,
   "end_elevation_m": 151.85769261151233,
   "start_xy": [
    484050.4344366748,
    4900791.827368144
   ],
   "end_xy": [
    484008.44638059195,
    4900764.820540335
   ]
  },
  "max_100m": {
   "gradient_pct": 17.177024099201788,
   "start_distance_m": 514.0,
   "end_distance_m": 614.0,
   "midpoint_distance_m": 564.0,
   "start_elevation_m": 138.8092016030884,
   "end_elevation_m": 155.9862257022902,
   "start_xy": [
    484070.362439116,
    4900801.148028995
   ],
   "end_xy": [
    483986.32071522303,
    4900747.697503919
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.110754897190191,
   "start_distance_m": 1.0,
   "end_distance_m": 6.0,
   "midpoint_distance_m": 3.5,
   "start_elevation_m": 115.04653923624396,
   "end_elevation_m": 114.79100149138445,
   "start_xy": [
    483964.5487296695,
    4900313.454238146
   ],
   "end_xy": [
    483964.1773780167,
    4900318.440428871
   ]
  },
  "min_10m": {
   "gradient_pct": -3.689281619432734,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 115.07016011705892,
   "end_elevation_m": 114.70123195511565,
   "start_xy": [
    483964.623,
    4900312.457
   ],
   "end_xy": [
    483963.8802966945,
    4900322.429381452
   ]
  },
  "min_20m": {
   "gradient_pct": -1.9585509714787719,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 115.07016011705892,
   "end_elevation_m": 114.67844992276316,
   "start_xy": [
    483964.623,
    4900312.457
   ],
   "end_xy": [
    483964.96713899454,
    4900332.212849119
   ]
  },
  "min_25m": {
   "gradient_pct": -1.4564102731305866,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 115.07016011705892,
   "end_elevation_m": 114.70605754877627,
   "start_xy": [
    483964.623,
    4900312.457
   ],
   "end_xy": [
    483966.3495126657,
    4900337.017955053
   ]
  },
  "min_50m": {
   "gradient_pct": -0.4262962143961033,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 115.07016011705892,
   "end_elevation_m": 114.85701200986087,
   "start_xy": [
    483964.623,
    4900312.457
   ],
   "end_xy": [
    483973.80762349314,
    4900360.864742603
   ]
  },
  "min_100m": {
   "gradient_pct": 0.060989450668031964,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 115.07016011705892,
   "end_elevation_m": 115.13114956772695,
   "start_xy": [
    483964.623,
    4900312.457
   ],
   "end_xy": [
    483991.0630895435,
    4900407.79286734
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.152615035415124,
   "start_distance_m": 558.0,
   "end_distance_m": 560.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 146.4321122346833,
   "end_elevation_m": 146.8751645353916,
   "start_xy": [
    484031.4178462662,
    4900780.770122514
   ],
   "end_xy": [
    484029.69136177993,
    4900779.760542741
   ]
  },
  "max_3m": {
   "gradient_pct": 21.45635167736752,
   "start_distance_m": 558.0,
   "end_distance_m": 561.0,
   "midpoint_distance_m": 559.5,
   "start_elevation_m": 146.4321122346833,
   "end_elevation_m": 147.07580278500433,
   "start_xy": [
    484031.4178462662,
    4900780.770122514
   ],
   "end_xy": [
    484028.82811953686,
    4900779.255752854
   ]
  }
 },
 "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/me/USGS_1M_19_x48y491_ME_MidCoast_2021_B21.tif"
  ],
  "calculated_at": "2026-08-24T20:42:06+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/maine-2026-08-22.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-me-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, ME_MidCoast_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x48y491"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.3% over 200 m (Terrain 50), gain 86.5 m over 959 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Hope",
  "county": "Maine"
 }
}