{
 "ocl_version": "0.1.0",
 "name": "Shadowland Road",
 "slug": "shadowland-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.26970660434813,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 596.0,
   "end_distance_m": 598.0,
   "start_elevation_m": 198.24191240969077,
   "end_elevation_m": 198.74730654177773,
   "min_gradient_pct": -5.583374360510618
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.869945214541644,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 596.0,
   "end_distance_m": 599.0,
   "start_elevation_m": 198.24191240969077,
   "end_elevation_m": 198.98801076612702,
   "min_gradient_pct": -5.346420089339669
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.733526559310235,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 584.0,
   "end_distance_m": 589.0,
   "start_elevation_m": 195.38016196664023,
   "end_elevation_m": 196.61683829460574,
   "min_gradient_pct": -4.9329849935196535
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.328611048128437,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 583.0,
   "end_distance_m": 593.0,
   "start_elevation_m": 195.1340476749704,
   "end_elevation_m": 197.56690877978323,
   "min_gradient_pct": -4.423827186523113
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.991301041608608,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 581.0,
   "end_distance_m": 601.0,
   "start_elevation_m": 194.65348801428087,
   "end_elevation_m": 199.4517482226026,
   "min_gradient_pct": -3.8398680975492994
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.73446353745146,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 580.0,
   "end_distance_m": 605.0,
   "start_elevation_m": 194.43578102000905,
   "end_elevation_m": 200.3693969043719,
   "min_gradient_pct": -3.3606676726277556
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.007374822875363,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 563.0,
   "end_distance_m": 613.0,
   "start_elevation_m": 191.07294634752844,
   "end_elevation_m": 202.07663375896612,
   "min_gradient_pct": -1.6412634326632087
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.656444672240184,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 543.0,
   "end_distance_m": 643.0,
   "start_elevation_m": 187.93348016208236,
   "end_elevation_m": 206.58992483432255,
   "min_gradient_pct": -0.21932855088994074
  }
 ],
 "shape": {
  "ascent_concentration": 0.503,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 117.0,
  "shape_class": "stepped"
 },
 "length_m": 766.055502541927,
 "start_elevation_m": 163.87151633388402,
 "end_elevation_m": 214.08711851551016,
 "endpoint_gain_m": 50.21560218162614,
 "overall_gradient_pct": 6.55508667648762,
 "accumulated_ascent_m": 51.72954049698032,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.733526559310235,
   "start_distance_m": 584.0,
   "end_distance_m": 589.0,
   "midpoint_distance_m": 586.5,
   "start_elevation_m": 195.38016196664023,
   "end_elevation_m": 196.61683829460574,
   "start_xy": [
    625138.8738469135,
    4608570.898054809
   ],
   "end_xy": [
    625135.3279930056,
    4608574.423238501
   ]
  },
  "max_10m": {
   "gradient_pct": 24.328611048128437,
   "start_distance_m": 583.0,
   "end_distance_m": 593.0,
   "midpoint_distance_m": 588.0,
   "start_elevation_m": 195.1340476749704,
   "end_elevation_m": 197.56690877978323,
   "start_xy": [
    625139.583017695,
    4608570.19301807
   ],
   "end_xy": [
    625132.4913098792,
    4608577.243385456
   ]
  },
  "max_20m": {
   "gradient_pct": 23.991301041608608,
   "start_distance_m": 581.0,
   "end_distance_m": 601.0,
   "midpoint_distance_m": 591.0,
   "start_elevation_m": 194.65348801428087,
   "end_elevation_m": 199.4517482226026,
   "start_xy": [
    625141.0013592582,
    4608568.782944594
   ],
   "end_xy": [
    625126.8179436267,
    4608582.883679363
   ]
  },
  "max_25m": {
   "gradient_pct": 23.73446353745146,
   "start_distance_m": 580.0,
   "end_distance_m": 605.0,
   "midpoint_distance_m": 592.5,
   "start_elevation_m": 194.43578102000905,
   "end_elevation_m": 200.3693969043719,
   "start_xy": [
    625141.7105300397,
    4608568.077907856
   ],
   "end_xy": [
    625123.9482066843,
    4608585.66820195
   ]
  },
  "max_50m": {
   "gradient_pct": 22.007374822875363,
   "start_distance_m": 563.0,
   "end_distance_m": 613.0,
   "midpoint_distance_m": 588.0,
   "start_elevation_m": 191.07294634752844,
   "end_elevation_m": 202.07663375896612,
   "start_xy": [
    625153.7789981078,
    4608556.104948636
   ],
   "end_xy": [
    625117.8995921176,
    4608590.904064995
   ]
  },
  "max_100m": {
   "gradient_pct": 18.656444672240184,
   "start_distance_m": 543.0,
   "end_distance_m": 643.0,
   "midpoint_distance_m": 593.0,
   "start_elevation_m": 187.93348016208236,
   "end_elevation_m": 206.58992483432255,
   "start_xy": [
    625167.9616372323,
    4608542.006570861
   ],
   "end_xy": [
    625090.0577691563,
    4608591.606166373
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.9329849935196535,
   "start_distance_m": 417.0,
   "end_distance_m": 422.0,
   "midpoint_distance_m": 419.5,
   "start_elevation_m": 185.64348055417918,
   "end_elevation_m": 185.3968313045032,
   "start_xy": [
    625267.4021914196,
    4608489.073889717
   ],
   "end_xy": [
    625262.5191060058,
    4608489.378890571
   ]
  },
  "min_10m": {
   "gradient_pct": -4.423827186523113,
   "start_distance_m": 411.0,
   "end_distance_m": 421.0,
   "midpoint_distance_m": 416.0,
   "start_elevation_m": 185.88111772286874,
   "end_elevation_m": 185.43873500421643,
   "start_xy": [
    625272.7871414002,
    4608486.427701193
   ],
   "end_xy": [
    625263.5180390825,
    4608489.425071824
   ]
  },
  "min_20m": {
   "gradient_pct": -3.8398680975492994,
   "start_distance_m": 408.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 418.0,
   "start_elevation_m": 185.9914917013808,
   "end_elevation_m": 185.22351808187094,
   "start_xy": [
    625275.4796163904,
    4608485.104606931
   ],
   "end_xy": [
    625256.5255075451,
    4608489.101803053
   ]
  },
  "min_25m": {
   "gradient_pct": -3.3606676726277556,
   "start_distance_m": 408.0,
   "end_distance_m": 433.0,
   "midpoint_distance_m": 420.5,
   "start_elevation_m": 185.9914917013808,
   "end_elevation_m": 185.15132478322386,
   "start_xy": [
    625275.4796163904,
    4608485.104606931
   ],
   "end_xy": [
    625251.648384175,
    4608488.039356464
   ]
  },
  "min_50m": {
   "gradient_pct": -1.6412634326632087,
   "start_distance_m": 400.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 425.0,
   "start_elevation_m": 185.82798334497534,
   "end_elevation_m": 185.00735162864373,
   "start_xy": [
    625282.7951353163,
    4608481.881221517
   ],
   "end_xy": [
    625235.0291518708,
    4608484.476004409
   ]
  },
  "min_100m": {
   "gradient_pct": -0.21932855088994074,
   "start_distance_m": 372.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 422.0,
   "start_elevation_m": 185.6333400129612,
   "end_elevation_m": 185.41401146207127,
   "start_xy": [
    625308.7004833184,
    4608471.30713628
   ],
   "end_xy": [
    625214.3765730758,
    4608489.831810542
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.26970660434813,
   "start_distance_m": 596.0,
   "end_distance_m": 598.0,
   "midpoint_distance_m": 597.0,
   "start_elevation_m": 198.24191240969077,
   "end_elevation_m": 198.74730654177773,
   "start_xy": [
    625130.3637975346,
    4608579.35849567
   ],
   "end_xy": [
    625128.9454559714,
    4608580.768569147
   ]
  },
  "max_3m": {
   "gradient_pct": 24.869945214541644,
   "start_distance_m": 596.0,
   "end_distance_m": 599.0,
   "midpoint_distance_m": 597.5,
   "start_elevation_m": 198.24191240969077,
   "end_elevation_m": 198.98801076612702,
   "start_xy": [
    625130.3637975346,
    4608579.35849567
   ],
   "end_xy": [
    625128.2362851899,
    4608581.473605886
   ]
  }
 },
 "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_start_earlier"
  ]
 },
 "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ct/USGS_1M_18_x62y461_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:49:15+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/connecticut-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ct-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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x62y461"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.5% over 200 m (Terrain 50), gain 34.6 m over 499 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": "Sherman",
  "county": "Connecticut"
 }
}