{
 "ocl_version": "0.1.0",
 "name": "Ferry Road",
 "slug": "ferry-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 36.79407141313025,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 200.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 30.460626337251433,
   "end_elevation_m": 31.19650776551404,
   "min_gradient_pct": -33.14741163972208
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.317492712946816,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 199.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 30.226982984125634,
   "end_elevation_m": 31.19650776551404,
   "min_gradient_pct": -29.732380657935902
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.212148709940276,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 23.296386950475334,
   "min_gradient_pct": -21.53362759176055
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.34299365845223,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 116.0,
   "end_distance_m": 126.0,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 24.470078880823543,
   "min_gradient_pct": -10.879717378939091
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.44463958969548,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 116.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 26.724707432917416,
   "min_gradient_pct": 0.2735839372799198
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.857345878894947,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 112.0,
   "end_distance_m": 137.0,
   "start_elevation_m": 20.99927906197687,
   "end_elevation_m": 26.963615531700608,
   "min_gradient_pct": 2.1202311054461234
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.825522185300258,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 18.54066680795081,
   "end_elevation_m": 27.45342790060094,
   "min_gradient_pct": 2.5444751944283155
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.760694500429175,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 14.692733400171765,
   "end_elevation_m": 27.45342790060094,
   "min_gradient_pct": 2.825847238916402
  }
 ],
 "shape": {
  "ascent_concentration": 0.461,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 45.0,
  "shape_class": "stepped"
 },
 "length_m": 675.8433793027975,
 "start_elevation_m": 12.868701284238686,
 "end_elevation_m": 52.9241509605033,
 "endpoint_gain_m": 40.055449676264615,
 "overall_gradient_pct": 5.926735528220453,
 "accumulated_ascent_m": 43.37536398405602,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.212148709940276,
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 118.5,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 23.296386950475334,
   "start_xy": [
    442537.51650515205,
    4917697.709721691
   ],
   "end_xy": [
    442533.98550946976,
    4917701.249788003
   ]
  },
  "max_10m": {
   "gradient_pct": 26.34299365845223,
   "start_distance_m": 116.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 121.0,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 24.470078880823543,
   "start_xy": [
    442537.51650515205,
    4917697.709721691
   ],
   "end_xy": [
    442530.45451378747,
    4917704.789854314
   ]
  },
  "max_20m": {
   "gradient_pct": 24.44463958969548,
   "start_distance_m": 116.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 126.0,
   "start_elevation_m": 21.83577951497832,
   "end_elevation_m": 26.724707432917416,
   "start_xy": [
    442537.51650515205,
    4917697.709721691
   ],
   "end_xy": [
    442523.3925224229,
    4917711.869986938
   ]
  },
  "max_25m": {
   "gradient_pct": 23.857345878894947,
   "start_distance_m": 112.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 124.5,
   "start_elevation_m": 20.99927906197687,
   "end_elevation_m": 26.963615531700608,
   "start_xy": [
    442540.34130169783,
    4917694.8776686415
   ],
   "end_xy": [
    442522.68632328644,
    4917712.5780002
   ]
  },
  "max_50m": {
   "gradient_pct": 17.825522185300258,
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 18.54066680795081,
   "end_elevation_m": 27.45342790060094,
   "start_xy": [
    442555.87768269994,
    4917679.30137687
   ],
   "end_xy": [
    442520.56772587704,
    4917714.702039988
   ]
  },
  "max_100m": {
   "gradient_pct": 12.760694500429175,
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 90.0,
   "start_elevation_m": 14.692733400171765,
   "end_elevation_m": 27.45342790060094,
   "start_xy": [
    442591.1876395228,
    4917643.900713752
   ],
   "end_xy": [
    442520.56772587704,
    4917714.702039988
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.53362759176055,
   "start_distance_m": 141.0,
   "end_distance_m": 146.0,
   "midpoint_distance_m": 143.5,
   "start_elevation_m": 27.46706261938575,
   "end_elevation_m": 26.390381239797723,
   "start_xy": [
    442519.8615267406,
    4917715.410053249
   ],
   "end_xy": [
    442516.3305310583,
    4917718.9501195615
   ]
  },
  "min_10m": {
   "gradient_pct": -10.879717378939091,
   "start_distance_m": 141.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 146.0,
   "start_elevation_m": 27.46706261938575,
   "end_elevation_m": 26.37909088149184,
   "start_xy": [
    442519.8615267406,
    4917715.410053249
   ],
   "end_xy": [
    442512.799535376,
    4917722.490185874
   ]
  },
  "min_20m": {
   "gradient_pct": 0.2735839372799198,
   "start_distance_m": 179.0,
   "end_distance_m": 199.0,
   "midpoint_distance_m": 189.0,
   "start_elevation_m": 30.17226619666965,
   "end_elevation_m": 30.226982984125634,
   "start_xy": [
    442493.02595955523,
    4917742.314557219
   ],
   "end_xy": [
    442478.9019768261,
    4917756.474822466
   ]
  },
  "min_25m": {
   "gradient_pct": 2.1202311054461234,
   "start_distance_m": 226.0,
   "end_distance_m": 251.0,
   "midpoint_distance_m": 238.5,
   "start_elevation_m": 33.63257790344335,
   "end_elevation_m": 34.16263567980488,
   "start_xy": [
    442459.83460014174,
    4917775.59118055
   ],
   "end_xy": [
    442442.11964291014,
    4917793.222192727
   ]
  },
  "min_50m": {
   "gradient_pct": 2.5444751944283155,
   "start_distance_m": 484.0,
   "end_distance_m": 534.0,
   "midpoint_distance_m": 509.0,
   "start_elevation_m": 45.75455769941798,
   "end_elevation_m": 47.02679529663214,
   "start_xy": [
    442237.26979807037,
    4917900.164162222
   ],
   "end_xy": [
    442200.9247551375,
    4917934.501282867
   ]
  },
  "min_100m": {
   "gradient_pct": 2.825847238916402,
   "start_distance_m": 444.0,
   "end_distance_m": 544.0,
   "midpoint_distance_m": 494.0,
   "start_elevation_m": 44.474156578722535,
   "end_elevation_m": 47.30000381763894,
   "start_xy": [
    442269.7574742221,
    4917876.930990034
   ],
   "end_xy": [
    442193.6557465509,
    4917941.368706997
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 36.79407141313025,
   "start_distance_m": 200.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 201.0,
   "start_elevation_m": 30.460626337251433,
   "end_elevation_m": 31.19650776551404,
   "start_xy": [
    442478.19577768963,
    4917757.182835729
   ],
   "end_xy": [
    442476.7833794167,
    4917758.598862253
   ]
  },
  "max_3m": {
   "gradient_pct": 32.317492712946816,
   "start_distance_m": 199.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 200.5,
   "start_elevation_m": 30.226982984125634,
   "end_elevation_m": 31.19650776551404,
   "start_xy": [
    442478.9019768261,
    4917756.474822466
   ],
   "end_xy": [
    442476.7833794167,
    4917758.598862253
   ]
  }
 },
 "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": []
 },
 "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_x44y492_ME_SouthCentral_B22.tif"
  ],
  "calculated_at": "2026-08-24T20:41:57+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-5-260824",
  "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_SouthCentral_B22 (collected 2022)",
  "elevation_tile_ids": [
   "x44y492"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.5% over 200 m (Terrain 50), gain 40.0 m over 676 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": "Sidney",
  "county": "Maine"
 }
}