{
 "ocl_version": "0.1.0",
 "name": "Blacks Road",
 "slug": "blacks-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.63887262574826,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 304.0,
   "end_distance_m": 306.0,
   "start_elevation_m": 134.55582960903521,
   "end_elevation_m": 135.50860706155018,
   "min_gradient_pct": -39.81211623078025,
   "suppressed_max_gradient_pct": 56.076104453718756,
   "suppressed_location_m": [
    596.0,
    598.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.82777890585779,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 407.0,
   "end_distance_m": 410.0,
   "start_elevation_m": 146.353498285298,
   "end_elevation_m": 147.57833165247374,
   "min_gradient_pct": -33.044589949458704,
   "suppressed_max_gradient_pct": 54.02622989428115,
   "suppressed_location_m": [
    595.0,
    598.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.48580098711966,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 407.0,
   "end_distance_m": 412.0,
   "start_elevation_m": 146.353498285298,
   "end_elevation_m": 148.12778833465399,
   "min_gradient_pct": -25.847359566876662,
   "suppressed_max_gradient_pct": 44.518575972551844,
   "suppressed_location_m": [
    594.0,
    599.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.181270109224386,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 456.0,
   "end_distance_m": 466.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 156.71085689434645,
   "min_gradient_pct": -16.52659469355143
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.928618533478584,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 456.0,
   "end_distance_m": 476.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 158.47845359011973,
   "min_gradient_pct": -12.967602520951402
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.097316272993794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 542.0,
   "end_distance_m": 567.0,
   "start_elevation_m": 168.02019136997208,
   "end_elevation_m": 173.54452043822053,
   "min_gradient_pct": -13.088588015750702
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.004376127790863,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 443.0,
   "end_distance_m": 493.0,
   "start_elevation_m": 151.7920384168269,
   "end_elevation_m": 161.29422648072233,
   "min_gradient_pct": -12.28947441548246
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.311063745994318,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 456.0,
   "end_distance_m": 556.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 171.20379362941833,
   "min_gradient_pct": -11.750793195782649
  }
 ],
 "shape": {
  "ascent_concentration": 0.498,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 106.0,
  "shape_class": "stepped"
 },
 "length_m": 2540.0414832011825,
 "start_elevation_m": 101.44602072403868,
 "end_elevation_m": 223.64283353615363,
 "endpoint_gain_m": 122.19681281211496,
 "overall_gradient_pct": 4.810819572053282,
 "accumulated_ascent_m": 170.22565242940763,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.48580098711966,
   "start_distance_m": 407.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 409.5,
   "start_elevation_m": 146.353498285298,
   "end_elevation_m": 148.12778833465399,
   "start_xy": [
    541323.15185689,
    4964462.8999746805
   ],
   "end_xy": [
    541328.0711100925,
    4964462.005017738
   ]
  },
  "max_10m": {
   "gradient_pct": 28.181270109224386,
   "start_distance_m": 456.0,
   "end_distance_m": 466.0,
   "midpoint_distance_m": 461.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 156.71085689434645,
   "start_xy": [
    541370.8145882848,
    4964451.888132396
   ],
   "end_xy": [
    541380.3741012192,
    4964448.952879008
   ]
  },
  "max_20m": {
   "gradient_pct": 22.928618533478584,
   "start_distance_m": 456.0,
   "end_distance_m": 476.0,
   "midpoint_distance_m": 466.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 158.47845359011973,
   "start_xy": [
    541370.8145882848,
    4964451.888132396
   ],
   "end_xy": [
    541389.9336141536,
    4964446.017625619
   ]
  },
  "max_25m": {
   "gradient_pct": 22.097316272993794,
   "start_distance_m": 542.0,
   "end_distance_m": 567.0,
   "midpoint_distance_m": 554.5,
   "start_elevation_m": 168.02019136997208,
   "end_elevation_m": 173.54452043822053,
   "start_xy": [
    541453.445377635,
    4964428.571175792
   ],
   "end_xy": [
    541478.2329936718,
    4964425.319393018
   ]
  },
  "max_50m": {
   "gradient_pct": 19.004376127790863,
   "start_distance_m": 443.0,
   "end_distance_m": 493.0,
   "midpoint_distance_m": 468.0,
   "start_elevation_m": 151.7920384168269,
   "end_elevation_m": 161.29422648072233,
   "start_xy": [
    541358.38722147,
    4964455.703961802
   ],
   "end_xy": [
    541406.1847861423,
    4964441.027694858
   ]
  },
  "max_100m": {
   "gradient_pct": 17.311063745994318,
   "start_distance_m": 456.0,
   "end_distance_m": 556.0,
   "midpoint_distance_m": 506.0,
   "start_elevation_m": 153.892729883424,
   "end_elevation_m": 171.20379362941833,
   "start_xy": [
    541370.8145882848,
    4964451.888132396
   ],
   "end_xy": [
    541467.3264426156,
    4964426.750177439
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -25.847359566876662,
   "start_distance_m": 588.0,
   "end_distance_m": 593.0,
   "midpoint_distance_m": 590.5,
   "start_elevation_m": 176.10158116347964,
   "end_elevation_m": 174.8092131851358,
   "start_xy": [
    541499.0545911428,
    4964422.587895488
   ],
   "end_xy": [
    541504.0121143502,
    4964421.937538934
   ]
  },
  "min_10m": {
   "gradient_pct": -16.52659469355143,
   "start_distance_m": 2439.0,
   "end_distance_m": 2449.0,
   "midpoint_distance_m": 2444.0,
   "start_elevation_m": 234.07090122712387,
   "end_elevation_m": 232.41824175776873,
   "start_xy": [
    543164.3130650615,
    4964758.662305075
   ],
   "end_xy": [
    543174.0890079307,
    4964756.583769844
   ]
  },
  "min_20m": {
   "gradient_pct": -12.967602520951402,
   "start_distance_m": 2429.0,
   "end_distance_m": 2449.0,
   "midpoint_distance_m": 2439.0,
   "start_elevation_m": 235.011762261959,
   "end_elevation_m": 232.41824175776873,
   "start_xy": [
    543154.6090034221,
    4964761.0770903025
   ],
   "end_xy": [
    543174.0890079307,
    4964756.583769844
   ]
  },
  "min_25m": {
   "gradient_pct": -13.088588015750702,
   "start_distance_m": 2438.0,
   "end_distance_m": 2463.0,
   "midpoint_distance_m": 2450.5,
   "start_elevation_m": 234.15576259686898,
   "end_elevation_m": 230.8836155929313,
   "start_xy": [
    543163.3426588975,
    4964758.903783597
   ],
   "end_xy": [
    543187.8694939779,
    4964754.114315592
   ]
  },
  "min_50m": {
   "gradient_pct": -12.28947441548246,
   "start_distance_m": 2400.0,
   "end_distance_m": 2450.0,
   "midpoint_distance_m": 2425.0,
   "start_elevation_m": 238.4366179646879,
   "end_elevation_m": 232.29188075694668,
   "start_xy": [
    543126.4672246677,
    4964768.079967464
   ],
   "end_xy": [
    543175.0733283627,
    4964756.407380254
   ]
  },
  "min_100m": {
   "gradient_pct": -11.750793195782649,
   "start_distance_m": 2349.0,
   "end_distance_m": 2449.0,
   "midpoint_distance_m": 2399.0,
   "start_elevation_m": 244.16903495355137,
   "end_elevation_m": 232.41824175776873,
   "start_xy": [
    543076.9765103064,
    4964780.395372127
   ],
   "end_xy": [
    543174.0890079307,
    4964756.583769844
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.63887262574826,
   "start_distance_m": 304.0,
   "end_distance_m": 306.0,
   "midpoint_distance_m": 305.0,
   "start_elevation_m": 134.55582960903521,
   "end_elevation_m": 135.50860706155018,
   "start_xy": [
    541221.8152409187,
    4964481.336087706
   ],
   "end_xy": [
    541223.7829421996,
    4964480.9781049285
   ]
  },
  "max_3m": {
   "gradient_pct": 40.82777890585779,
   "start_distance_m": 407.0,
   "end_distance_m": 410.0,
   "midpoint_distance_m": 408.5,
   "start_elevation_m": 146.353498285298,
   "end_elevation_m": 147.57833165247374,
   "start_xy": [
    541323.15185689,
    4964462.8999746805
   ],
   "end_xy": [
    541326.1034088115,
    4964462.363000515
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    594.0,
    599.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 2159.0,
  "trailing_descent_m": 31.8
 },
 "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_x54y497_ME_MidCentral_B23.tif"
  ],
  "calculated_at": "2026-08-24T20:43:20+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_MidCentral_B23 (collected 2023)",
  "elevation_tile_ids": [
   "x54y497"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.9% over 200 m (Terrain 50), gain 122.0 m over 2540 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": "Clifton",
  "county": "Maine"
 }
}