{
 "ocl_version": "0.1.0",
 "name": "Cobb Hill Road",
 "slug": "cobb-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.24221491432894,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 989.0,
   "end_distance_m": 991.0,
   "start_elevation_m": 130.5780117511051,
   "end_elevation_m": 131.54285604939167,
   "min_gradient_pct": -51.34593936667926
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.1633921441099,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 988.0,
   "end_distance_m": 991.0,
   "start_elevation_m": 130.30795428506838,
   "end_elevation_m": 131.54285604939167,
   "min_gradient_pct": -43.81760458932149
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.949715650547432,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1050.0,
   "end_distance_m": 1055.0,
   "start_elevation_m": 138.65064992834908,
   "end_elevation_m": 140.24813571087645,
   "min_gradient_pct": -34.174382836438895
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.948449137517912,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1050.0,
   "end_distance_m": 1060.0,
   "start_elevation_m": 138.65064992834908,
   "end_elevation_m": 141.64549484210087,
   "min_gradient_pct": -18.830907879442407
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.901256803086056,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 976.0,
   "end_distance_m": 996.0,
   "start_elevation_m": 127.78511870903009,
   "end_elevation_m": 132.3653700696473,
   "min_gradient_pct": -14.66833266661979
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.52731877303313,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 969.0,
   "end_distance_m": 994.0,
   "start_elevation_m": 126.75338887343614,
   "end_elevation_m": 132.13521856669442,
   "min_gradient_pct": -13.097732947900454
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.304780166217512,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 968.0,
   "end_distance_m": 1018.0,
   "start_elevation_m": 126.61906621336992,
   "end_elevation_m": 134.77145629647868,
   "min_gradient_pct": -7.870881427790266
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.89298584855308,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 970.0,
   "end_distance_m": 1070.0,
   "start_elevation_m": 126.96459849805674,
   "end_elevation_m": 142.85758434660983,
   "min_gradient_pct": -5.907999684601549
  }
 ],
 "shape": {
  "ascent_concentration": 0.456,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 43.0,
  "shape_class": "stepped"
 },
 "length_m": 3103.133213893601,
 "start_elevation_m": 113.40347402148632,
 "end_elevation_m": 184.58827239531936,
 "endpoint_gain_m": 71.18479837383305,
 "overall_gradient_pct": 2.2939652753261983,
 "accumulated_ascent_m": 122.43296529842745,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.949715650547432,
   "start_distance_m": 1050.0,
   "end_distance_m": 1055.0,
   "midpoint_distance_m": 1052.5,
   "start_elevation_m": 138.65064992834908,
   "end_elevation_m": 140.24813571087645,
   "start_xy": [
    378209.852443513,
    4882681.0275280345
   ],
   "end_xy": [
    378211.042663916,
    4882676.171256276
   ]
  },
  "max_10m": {
   "gradient_pct": 29.948449137517912,
   "start_distance_m": 1050.0,
   "end_distance_m": 1060.0,
   "midpoint_distance_m": 1055.0,
   "start_elevation_m": 138.65064992834908,
   "end_elevation_m": 141.64549484210087,
   "start_xy": [
    378209.852443513,
    4882681.0275280345
   ],
   "end_xy": [
    378212.23288431903,
    4882671.314984517
   ]
  },
  "max_20m": {
   "gradient_pct": 22.901256803086056,
   "start_distance_m": 976.0,
   "end_distance_m": 996.0,
   "midpoint_distance_m": 986.0,
   "start_elevation_m": 127.78511870903009,
   "end_elevation_m": 132.3653700696473,
   "start_xy": [
    378182.28953497496,
    4882749.524821256
   ],
   "end_xy": [
    378190.3336168445,
    4882731.21382055
   ]
  },
  "max_25m": {
   "gradient_pct": 21.52731877303313,
   "start_distance_m": 969.0,
   "end_distance_m": 994.0,
   "midpoint_distance_m": 981.5,
   "start_elevation_m": 126.75338887343614,
   "end_elevation_m": 132.13521856669442,
   "start_xy": [
    378179.47410632065,
    4882755.933671504
   ],
   "end_xy": [
    378189.5292086575,
    4882733.0449206205
   ]
  },
  "max_50m": {
   "gradient_pct": 16.304780166217512,
   "start_distance_m": 968.0,
   "end_distance_m": 1018.0,
   "midpoint_distance_m": 993.0,
   "start_elevation_m": 126.61906621336992,
   "end_elevation_m": 134.77145629647868,
   "start_xy": [
    378179.0719022272,
    4882756.84922154
   ],
   "end_xy": [
    378199.18210690096,
    4882711.071719773
   ]
  },
  "max_100m": {
   "gradient_pct": 15.89298584855308,
   "start_distance_m": 970.0,
   "end_distance_m": 1070.0,
   "midpoint_distance_m": 1020.0,
   "start_elevation_m": 126.96459849805674,
   "end_elevation_m": 142.85758434660983,
   "start_xy": [
    378179.8763104141,
    4882755.018121469
   ],
   "end_xy": [
    378214.61332512513,
    4882661.602441001
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -34.174382836438895,
   "start_distance_m": 1579.0,
   "end_distance_m": 1584.0,
   "midpoint_distance_m": 1581.5,
   "start_elevation_m": 165.94927415413406,
   "end_elevation_m": 164.24055501231211,
   "start_xy": [
    378459.76100717846,
    4882219.1574017815
   ],
   "end_xy": [
    378462.7193472031,
    4882215.1264931625
   ]
  },
  "min_10m": {
   "gradient_pct": -18.830907879442407,
   "start_distance_m": 2842.0,
   "end_distance_m": 2852.0,
   "midpoint_distance_m": 2847.0,
   "start_elevation_m": 192.90579911351674,
   "end_elevation_m": 191.0227083255725,
   "start_xy": [
    379156.4942115178,
    4881173.7538112765
   ],
   "end_xy": [
    379162.1165347286,
    4881165.484017947
   ]
  },
  "min_20m": {
   "gradient_pct": -14.66833266661979,
   "start_distance_m": 2838.0,
   "end_distance_m": 2858.0,
   "midpoint_distance_m": 2848.0,
   "start_elevation_m": 193.22774601111763,
   "end_elevation_m": 190.29407947779367,
   "start_xy": [
    379154.24528223346,
    4881177.061728608
   ],
   "end_xy": [
    379165.4899286551,
    4881160.522141949
   ]
  },
  "min_25m": {
   "gradient_pct": -13.097732947900454,
   "start_distance_m": 2833.0,
   "end_distance_m": 2858.0,
   "midpoint_distance_m": 2845.5,
   "start_elevation_m": 193.5685127147688,
   "end_elevation_m": 190.29407947779367,
   "start_xy": [
    379151.4341206281,
    4881181.196625273
   ],
   "end_xy": [
    379165.4899286551,
    4881160.522141949
   ]
  },
  "min_50m": {
   "gradient_pct": -7.870881427790266,
   "start_distance_m": 2994.0,
   "end_distance_m": 3044.0,
   "midpoint_distance_m": 3019.0,
   "start_elevation_m": 191.09726692939898,
   "end_elevation_m": 187.16182621550385,
   "start_xy": [
    379247.08805131784,
    4881052.259177869
   ],
   "end_xy": [
    379282.14243391703,
    4881016.60542266
   ]
  },
  "min_100m": {
   "gradient_pct": -5.907999684601549,
   "start_distance_m": 2997.0,
   "end_distance_m": 3097.0,
   "midpoint_distance_m": 3047.0,
   "start_elevation_m": 190.9150262279854,
   "end_elevation_m": 185.00702654338386,
   "start_xy": [
    379249.1913142738,
    4881050.119952557
   ],
   "end_xy": [
    379319.3000794722,
    4880978.812442137
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.24221491432894,
   "start_distance_m": 989.0,
   "end_distance_m": 991.0,
   "midpoint_distance_m": 990.0,
   "start_elevation_m": 130.5780117511051,
   "end_elevation_m": 131.54285604939167,
   "start_xy": [
    378187.5181881902,
    4882737.622670798
   ],
   "end_xy": [
    378188.3225963771,
    4882735.791570727
   ]
  },
  "max_3m": {
   "gradient_pct": 41.1633921441099,
   "start_distance_m": 988.0,
   "end_distance_m": 991.0,
   "midpoint_distance_m": 989.5,
   "start_elevation_m": 130.30795428506838,
   "end_elevation_m": 131.54285604939167,
   "start_xy": [
    378187.11598409666,
    4882738.538220833
   ],
   "end_xy": [
    378188.3225963771,
    4882735.791570727
   ]
  }
 },
 "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": 2805.0,
  "trailing_descent_m": 9.3
 },
 "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_x37y489_ME_WesternMtns_B24.tif"
  ],
  "calculated_at": "2026-08-24T20:38:54+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-3-260824",
  "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": [
   "x37y489"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.5% over 200 m (Terrain 50), gain 66.2 m over 2919 m way. EXTENDED by graph walk: +1 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": "Otisfield",
  "county": "Maine"
 }
}