{
 "ocl_version": "0.1.0",
 "name": "Griffin Hill Lane",
 "slug": "griffin-hill-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.393175732892416,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 242.0,
   "end_distance_m": 244.0,
   "start_elevation_m": 169.52951375242185,
   "end_elevation_m": 170.0773772670797,
   "min_gradient_pct": -3.0387703349191497
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.77725943642694,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 241.0,
   "end_distance_m": 244.0,
   "start_elevation_m": 169.2740594839869,
   "end_elevation_m": 170.0773772670797,
   "min_gradient_pct": -2.4107602277799365
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.95737325233131,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 241.0,
   "end_distance_m": 246.0,
   "start_elevation_m": 169.2740594839869,
   "end_elevation_m": 170.57192814660345,
   "min_gradient_pct": -2.0415743662977093
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.040564800368372,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 234.0,
   "end_distance_m": 244.0,
   "start_elevation_m": 167.57332078704286,
   "end_elevation_m": 170.0773772670797,
   "min_gradient_pct": -0.4374113384409384
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.636685652999972,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 229.0,
   "end_distance_m": 249.0,
   "start_elevation_m": 166.33466650611584,
   "end_elevation_m": 171.26200363671583,
   "min_gradient_pct": 1.820584766235669
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.229298024137165,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 224.0,
   "end_distance_m": 249.0,
   "start_elevation_m": 165.20467913068154,
   "end_elevation_m": 171.26200363671583,
   "min_gradient_pct": 1.9784460279925042
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.396542883400397,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 202.0,
   "end_distance_m": 252.0,
   "start_elevation_m": 161.15398421980447,
   "end_elevation_m": 171.85225566150467,
   "min_gradient_pct": 4.097158270554871
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.665254696627898,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 155.0,
   "end_distance_m": 255.0,
   "start_elevation_m": 152.70853541362982,
   "end_elevation_m": 172.37379011025772,
   "min_gradient_pct": 7.315579691313417
  }
 ],
 "shape": {
  "ascent_concentration": 0.418,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 136.0,
  "shape_class": "sustained"
 },
 "length_m": 277.6970888748247,
 "start_elevation_m": 139.64611005018708,
 "end_elevation_m": 173.34241470543043,
 "endpoint_gain_m": 33.69630465524335,
 "overall_gradient_pct": 12.13419441729631,
 "accumulated_ascent_m": 33.79838337355824,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.95737325233131,
   "start_distance_m": 241.0,
   "end_distance_m": 246.0,
   "midpoint_distance_m": 243.5,
   "start_elevation_m": 169.2740594839869,
   "end_elevation_m": 170.57192814660345,
   "start_xy": [
    629555.6202880744,
    4573819.811298779
   ],
   "end_xy": [
    629552.0414908346,
    4573816.319564207
   ]
  },
  "max_10m": {
   "gradient_pct": 25.040564800368372,
   "start_distance_m": 234.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 239.0,
   "start_elevation_m": 167.57332078704286,
   "end_elevation_m": 170.0773772670797,
   "start_xy": [
    629560.1250940801,
    4573825.164353231
   ],
   "end_xy": [
    629553.4730097305,
    4573817.716258036
   ]
  },
  "max_20m": {
   "gradient_pct": 24.636685652999972,
   "start_distance_m": 229.0,
   "end_distance_m": 249.0,
   "midpoint_distance_m": 239.0,
   "start_elevation_m": 166.33466650611584,
   "end_elevation_m": 171.26200363671583,
   "start_xy": [
    629563.3033429934,
    4573829.024241033
   ],
   "end_xy": [
    629549.8942124908,
    4573814.224523465
   ]
  },
  "max_25m": {
   "gradient_pct": 24.229298024137165,
   "start_distance_m": 224.0,
   "end_distance_m": 249.0,
   "midpoint_distance_m": 236.5,
   "start_elevation_m": 165.20467913068154,
   "end_elevation_m": 171.26200363671583,
   "start_xy": [
    629566.4815919067,
    4573832.884128835
   ],
   "end_xy": [
    629549.8942124908,
    4573814.224523465
   ]
  },
  "max_50m": {
   "gradient_pct": 21.396542883400397,
   "start_distance_m": 202.0,
   "end_distance_m": 252.0,
   "midpoint_distance_m": 227.0,
   "start_elevation_m": 161.15398421980447,
   "end_elevation_m": 171.85225566150467,
   "start_xy": [
    629580.8364459011,
    4573849.551469768
   ],
   "end_xy": [
    629547.746934147,
    4573812.129482722
   ]
  },
  "max_100m": {
   "gradient_pct": 19.665254696627898,
   "start_distance_m": 155.0,
   "end_distance_m": 255.0,
   "midpoint_distance_m": 205.0,
   "start_elevation_m": 152.70853541362982,
   "end_elevation_m": 172.37379011025772,
   "start_xy": [
    629620.9684113814,
    4573872.91568793
   ],
   "end_xy": [
    629545.5996558031,
    4573810.034441979
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.0415743662977093,
   "start_distance_m": 268.0,
   "end_distance_m": 273.0,
   "midpoint_distance_m": 270.5,
   "start_elevation_m": 173.377359189681,
   "end_elevation_m": 173.2752804713661,
   "start_xy": [
    629536.2947829798,
    4573800.955932094
   ],
   "end_xy": [
    629532.7159857401,
    4573797.464197522
   ]
  },
  "min_10m": {
   "gradient_pct": -0.4374113384409384,
   "start_distance_m": 267.0,
   "end_distance_m": 277.0,
   "midpoint_distance_m": 272.0,
   "start_elevation_m": 173.36365466561375,
   "end_elevation_m": 173.31991353176966,
   "start_xy": [
    629537.0105424278,
    4573801.654279008
   ],
   "end_xy": [
    629529.8529479483,
    4573794.670809865
   ]
  },
  "min_20m": {
   "gradient_pct": 1.820584766235669,
   "start_distance_m": 100.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 148.20855019132202,
   "end_elevation_m": 148.57266714456915,
   "start_xy": [
    629663.6556691873,
    4573871.249524205
   ],
   "end_xy": [
    629653.6386119355,
    4573885.366779077
   ]
  },
  "min_25m": {
   "gradient_pct": 1.9784460279925042,
   "start_distance_m": 95.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 107.5,
   "start_elevation_m": 148.07805563757103,
   "end_elevation_m": 148.57266714456915,
   "start_xy": [
    629665.3194886274,
    4573866.537386101
   ],
   "end_xy": [
    629653.6386119355,
    4573885.366779077
   ]
  },
  "min_50m": {
   "gradient_pct": 4.097158270554871,
   "start_distance_m": 80.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 105.0,
   "start_elevation_m": 147.127730449633,
   "end_elevation_m": 149.17630958491043,
   "start_xy": [
    629669.1360820838,
    4573852.033002991
   ],
   "end_xy": [
    629644.5027021893,
    4573881.346595085
   ]
  },
  "min_100m": {
   "gradient_pct": 7.315579691313417,
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 142.0405612571937,
   "end_elevation_m": 149.35614094850712,
   "start_xy": [
    629683.3544062095,
    4573806.34925655
   ],
   "end_xy": [
    629642.6183354439,
    4573880.676399615
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.393175732892416,
   "start_distance_m": 242.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 243.0,
   "start_elevation_m": 169.52951375242185,
   "end_elevation_m": 170.0773772670797,
   "start_xy": [
    629554.9045286264,
    4573819.1129518645
   ],
   "end_xy": [
    629553.4730097305,
    4573817.716258036
   ]
  },
  "max_3m": {
   "gradient_pct": 26.77725943642694,
   "start_distance_m": 241.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 242.5,
   "start_elevation_m": 169.2740594839869,
   "end_elevation_m": 170.0773772670797,
   "start_xy": [
    629555.6202880744,
    4573819.811298779
   ],
   "end_xy": [
    629553.4730097305,
    4573817.716258036
   ]
  }
 },
 "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_x62y458_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:56:30+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": [
   "x62y458"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.8% over 200 m (Terrain 50), gain 25.7 m over 161 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": "Redding",
  "county": "Connecticut"
 }
}