{
 "ocl_version": "0.1.0",
 "name": "Old Bray Hill Road",
 "slug": "old-bray-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 31.15191821685812,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 304.0,
   "end_distance_m": 306.0,
   "start_elevation_m": 281.0016273649443,
   "end_elevation_m": 281.62466572928145,
   "min_gradient_pct": -27.173402054683038
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.302748164075336,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 304.0,
   "end_distance_m": 307.0,
   "start_elevation_m": 281.0016273649443,
   "end_elevation_m": 281.85070980986654,
   "min_gradient_pct": -20.96957461775825
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.399202340742477,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 305.0,
   "end_distance_m": 310.0,
   "start_elevation_m": 281.294553450708,
   "end_elevation_m": 282.66451356774513,
   "min_gradient_pct": -21.049019436201206
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.9820069593045,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 303.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 283.3229873665771,
   "min_gradient_pct": -18.93005606314489
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.82117391448827,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 303.0,
   "end_distance_m": 323.0,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 285.1890214535443,
   "min_gradient_pct": -17.12428532752824
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.477115927477143,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 303.0,
   "end_distance_m": 328.0,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 285.9440656525159,
   "min_gradient_pct": -16.63111942849514
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 14.948343322113828,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 296.0,
   "end_distance_m": 346.0,
   "start_elevation_m": 280.12019489415593,
   "end_elevation_m": 287.59436655521284,
   "min_gradient_pct": -14.855787365120818
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 11.918261578982026,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 152.0,
   "end_distance_m": 252.0,
   "start_elevation_m": 264.94151762622766,
   "end_elevation_m": 276.8597792052097,
   "min_gradient_pct": -11.452602520736491
  }
 ],
 "shape": {
  "ascent_concentration": 0.452,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 107.0,
  "shape_class": "stepped"
 },
 "length_m": 3218.2894899101993,
 "start_elevation_m": 259.05242412796804,
 "end_elevation_m": 319.6045317404903,
 "endpoint_gain_m": 60.55210761252226,
 "overall_gradient_pct": 1.8814997159939104,
 "accumulated_ascent_m": 114.54957213147668,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.399202340742477,
   "start_distance_m": 305.0,
   "end_distance_m": 310.0,
   "midpoint_distance_m": 307.5,
   "start_elevation_m": 281.294553450708,
   "end_elevation_m": 282.66451356774513,
   "start_xy": [
    393395.5779191481,
    4968600.838614874
   ],
   "end_xy": [
    393397.01592472807,
    4968605.627366272
   ]
  },
  "max_10m": {
   "gradient_pct": 24.9820069593045,
   "start_distance_m": 303.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 308.0,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 283.3229873665771,
   "start_xy": [
    393395.0027169161,
    4968598.923114315
   ],
   "end_xy": [
    393397.87872807606,
    4968608.50061711
   ]
  },
  "max_20m": {
   "gradient_pct": 21.82117391448827,
   "start_distance_m": 303.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 285.1890214535443,
   "start_xy": [
    393395.0027169161,
    4968598.923114315
   ],
   "end_xy": [
    393401.25360287796,
    4968617.86830184
   ]
  },
  "max_25m": {
   "gradient_pct": 20.477115927477143,
   "start_distance_m": 303.0,
   "end_distance_m": 328.0,
   "midpoint_distance_m": 315.5,
   "start_elevation_m": 280.82478667064663,
   "end_elevation_m": 285.9440656525159,
   "start_xy": [
    393395.0027169161,
    4968598.923114315
   ],
   "end_xy": [
    393403.6706316429,
    4968622.2452839
   ]
  },
  "max_50m": {
   "gradient_pct": 14.948343322113828,
   "start_distance_m": 296.0,
   "end_distance_m": 346.0,
   "midpoint_distance_m": 321.0,
   "start_elevation_m": 280.12019489415593,
   "end_elevation_m": 287.59436655521284,
   "start_xy": [
    393392.9895091041,
    4968592.218862358
   ],
   "end_xy": [
    393413.5106439581,
    4968637.239500532
   ]
  },
  "max_100m": {
   "gradient_pct": 11.918261578982026,
   "start_distance_m": 152.0,
   "end_distance_m": 252.0,
   "midpoint_distance_m": 202.0,
   "start_elevation_m": 264.94151762622766,
   "end_elevation_m": 276.8597792052097,
   "start_xy": [
    393399.4533972971,
    4968448.520077825
   ],
   "end_xy": [
    393393.8914717065,
    4968548.236972976
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.049019436201206,
   "start_distance_m": 2313.0,
   "end_distance_m": 2318.0,
   "midpoint_distance_m": 2315.5,
   "start_elevation_m": 311.5194905254146,
   "end_elevation_m": 310.46703955360454,
   "start_xy": [
    393608.4462893624,
    4970237.145129455
   ],
   "end_xy": [
    393606.9182072119,
    4970241.905903021
   ]
  },
  "min_10m": {
   "gradient_pct": -18.93005606314489,
   "start_distance_m": 3184.0,
   "end_distance_m": 3194.0,
   "midpoint_distance_m": 3189.0,
   "start_elevation_m": 324.47912055500024,
   "end_elevation_m": 322.58611494868575,
   "start_xy": [
    393466.4274356683,
    4971042.742061828
   ],
   "end_xy": [
    393471.62884350587,
    4971051.201862386
   ]
  },
  "min_20m": {
   "gradient_pct": -17.12428532752824,
   "start_distance_m": 3184.0,
   "end_distance_m": 3204.0,
   "midpoint_distance_m": 3194.0,
   "start_elevation_m": 324.47912055500024,
   "end_elevation_m": 321.0542634894946,
   "start_xy": [
    393466.4274356683,
    4971042.742061828
   ],
   "end_xy": [
    393478.54342119204,
    4971058.426031225
   ]
  },
  "min_25m": {
   "gradient_pct": -16.63111942849514,
   "start_distance_m": 3179.0,
   "end_distance_m": 3204.0,
   "midpoint_distance_m": 3191.5,
   "start_elevation_m": 325.2120433466184,
   "end_elevation_m": 321.0542634894946,
   "start_xy": [
    393464.09111975867,
    4971038.321470468
   ],
   "end_xy": [
    393478.54342119204,
    4971058.426031225
   ]
  },
  "min_50m": {
   "gradient_pct": -14.855787365120818,
   "start_distance_m": 3154.0,
   "end_distance_m": 3204.0,
   "midpoint_distance_m": 3179.0,
   "start_elevation_m": 328.482157172055,
   "end_elevation_m": 321.0542634894946,
   "start_xy": [
    393452.4095402106,
    4971016.218513669
   ],
   "end_xy": [
    393478.54342119204,
    4971058.426031225
   ]
  },
  "min_100m": {
   "gradient_pct": -11.452602520736491,
   "start_distance_m": 3118.0,
   "end_distance_m": 3218.0,
   "midpoint_distance_m": 3168.0,
   "start_elevation_m": 331.0851542736011,
   "end_elevation_m": 319.63255175286463,
   "start_xy": [
    393435.58806566143,
    4970984.390255879
   ],
   "end_xy": [
    393488.22382995265,
    4971068.539867601
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 31.15191821685812,
   "start_distance_m": 304.0,
   "end_distance_m": 306.0,
   "midpoint_distance_m": 305.0,
   "start_elevation_m": 281.0016273649443,
   "end_elevation_m": 281.62466572928145,
   "start_xy": [
    393395.2903180321,
    4968599.880864594
   ],
   "end_xy": [
    393395.8655202641,
    4968601.796365153
   ]
  },
  "max_3m": {
   "gradient_pct": 28.302748164075336,
   "start_distance_m": 304.0,
   "end_distance_m": 307.0,
   "midpoint_distance_m": 305.5,
   "start_elevation_m": 281.0016273649443,
   "end_elevation_m": 281.85070980986654,
   "start_xy": [
    393395.2903180321,
    4968599.880864594
   ],
   "end_xy": [
    393396.1531213801,
    4968602.7541154325
   ]
  }
 },
 "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_end"
  ],
  "suggested_summit_cut_m": 3120.0,
  "trailing_descent_m": 11.5
 },
 "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_x39y497_ME_WesternMtns_B24.tif",
   "data/cache/usa/me/USGS_1M_19_x39y498_ME_WesternMtns_B24.tif"
  ],
  "calculated_at": "2026-08-24T20:58:25+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-6-260824",
  "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_WesternMtns_B24 (collected 2024)",
  "elevation_tile_ids": [
   "x39y497",
   "x39y498"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.3% over 200 m (Terrain 50), gain 34.0 m over 2898 m way. EXTENDED by graph walk: +2 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 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Phillips",
  "county": "Maine"
 }
}