{
 "ocl_version": "0.1.0",
 "name": "Cragmere Road",
 "slug": "cragmere-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.909152119285352,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 142.0,
   "start_elevation_m": 132.21810315576607,
   "end_elevation_m": 132.77628619815178,
   "min_gradient_pct": -15.73627043418071
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.321593265811355,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 139.0,
   "end_distance_m": 142.0,
   "start_elevation_m": 131.95663840017744,
   "end_elevation_m": 132.77628619815178,
   "min_gradient_pct": -15.433057928347202
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.97643443173945,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 132.21810315576607,
   "end_elevation_m": 133.56692487735305,
   "min_gradient_pct": -15.366911608497276
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.13050145661049,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 136.0,
   "end_distance_m": 146.0,
   "start_elevation_m": 131.19567126421728,
   "end_elevation_m": 133.80872140987833,
   "min_gradient_pct": -14.394639550438626
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.115729805466515,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 127.0,
   "end_distance_m": 147.0,
   "start_elevation_m": 129.20351792885342,
   "end_elevation_m": 134.02666388994672,
   "min_gradient_pct": -12.36885358062608
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.175749727495713,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 123.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 128.42971880186073,
   "end_elevation_m": 134.22365623373466,
   "min_gradient_pct": -12.026617696948279
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.684424685089994,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 184.0,
   "end_distance_m": 234.0,
   "start_elevation_m": 138.3054191499371,
   "end_elevation_m": 148.1476314924821,
   "min_gradient_pct": -10.236827638388547
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.573882964922348,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "start_elevation_m": 129.40962728816407,
   "end_elevation_m": 146.98351025308642,
   "min_gradient_pct": -6.304514926714944
  }
 ],
 "shape": {
  "ascent_concentration": 0.474,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 104.0,
  "shape_class": "stepped"
 },
 "length_m": 481.3887547458587,
 "start_elevation_m": 111.90466572195653,
 "end_elevation_m": 149.792600433496,
 "endpoint_gain_m": 37.88793471153947,
 "overall_gradient_pct": 7.870548353698413,
 "accumulated_ascent_m": 44.763607425820325,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.97643443173945,
   "start_distance_m": 140.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 142.5,
   "start_elevation_m": 132.21810315576607,
   "end_elevation_m": 133.56692487735305,
   "start_xy": [
    722816.7985245311,
    4599042.262314606
   ],
   "end_xy": [
    722814.5582413803,
    4599037.7922887225
   ]
  },
  "max_10m": {
   "gradient_pct": 26.13050145661049,
   "start_distance_m": 136.0,
   "end_distance_m": 146.0,
   "midpoint_distance_m": 141.0,
   "start_elevation_m": 131.19567126421728,
   "end_elevation_m": 133.80872140987833,
   "start_xy": [
    722818.5907510516,
    4599045.838335314
   ],
   "end_xy": [
    722813.9250036582,
    4599037.021579647
   ]
  },
  "max_20m": {
   "gradient_pct": 24.115729805466515,
   "start_distance_m": 127.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 137.0,
   "start_elevation_m": 129.20351792885342,
   "end_elevation_m": 134.02666388994672,
   "start_xy": [
    722822.6232607228,
    4599053.884381905
   ],
   "end_xy": [
    722813.2729929822,
    4599036.263369862
   ]
  },
  "max_25m": {
   "gradient_pct": 23.175749727495713,
   "start_distance_m": 123.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 135.5,
   "start_elevation_m": 128.42971880186073,
   "end_elevation_m": 134.22365623373466,
   "start_xy": [
    722824.4154872434,
    4599057.460402612
   ],
   "end_xy": [
    722812.6209823063,
    4599035.505160077
   ]
  },
  "max_50m": {
   "gradient_pct": 19.684424685089994,
   "start_distance_m": 184.0,
   "end_distance_m": 234.0,
   "midpoint_distance_m": 209.0,
   "start_elevation_m": 138.3054191499371,
   "end_elevation_m": 148.1476314924821,
   "start_xy": [
    722783.8636676254,
    4599024.240451657
   ],
   "end_xy": [
    722759.8896837861,
    4599067.585322835
   ]
  },
  "max_100m": {
   "gradient_pct": 17.573882964922348,
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 129.40962728816407,
   "end_elevation_m": 146.98351025308642,
   "start_xy": [
    722822.1752040928,
    4599052.990376728
   ],
   "end_xy": [
    722763.7589148856,
    4599062.999578544
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.366911608497276,
   "start_distance_m": 427.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 429.5,
   "start_elevation_m": 151.70231813608243,
   "end_elevation_m": 150.93397255565756,
   "start_xy": [
    722643.4595669857,
    4599209.546855653
   ],
   "end_xy": [
    722644.7167511059,
    4599214.386224215
   ]
  },
  "min_10m": {
   "gradient_pct": -14.394639550438626,
   "start_distance_m": 422.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 427.0,
   "start_elevation_m": 152.37343651070142,
   "end_elevation_m": 150.93397255565756,
   "start_xy": [
    722642.4053078318,
    4599204.662390526
   ],
   "end_xy": [
    722644.7167511059,
    4599214.386224215
   ]
  },
  "min_20m": {
   "gradient_pct": -12.36885358062608,
   "start_distance_m": 416.0,
   "end_distance_m": 436.0,
   "midpoint_distance_m": 426.0,
   "start_elevation_m": 152.9837959352796,
   "end_elevation_m": 150.5100252191544,
   "start_xy": [
    722641.3122852221,
    4599198.762788712
   ],
   "end_xy": [
    722645.722498402,
    4599218.257719066
   ]
  },
  "min_25m": {
   "gradient_pct": -12.026617696948279,
   "start_distance_m": 408.0,
   "end_distance_m": 433.0,
   "midpoint_distance_m": 420.5,
   "start_elevation_m": 153.81594369471173,
   "end_elevation_m": 150.80928927047466,
   "start_xy": [
    722640.2880460075,
    4599190.907411273
   ],
   "end_xy": [
    722644.96818793,
    4599215.354097928
   ]
  },
  "min_50m": {
   "gradient_pct": -10.236827638388547,
   "start_distance_m": 400.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 425.0,
   "start_elevation_m": 154.70369110661133,
   "end_elevation_m": 149.58527728741706,
   "start_xy": [
    722642.7637499891,
    4599183.408833634
   ],
   "end_xy": [
    722649.2426139383,
    4599231.807951042
   ]
  },
  "min_100m": {
   "gradient_pct": -6.304514926714944,
   "start_distance_m": 362.0,
   "end_distance_m": 462.0,
   "midpoint_distance_m": 412.0,
   "start_elevation_m": 155.5279123070057,
   "end_elevation_m": 149.22339738029075,
   "start_xy": [
    722666.2592324078,
    4599153.672714809
   ],
   "end_xy": [
    722650.3204140067,
    4599243.460271929
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.909152119285352,
   "start_distance_m": 140.0,
   "end_distance_m": 142.0,
   "midpoint_distance_m": 141.0,
   "start_elevation_m": 132.21810315576607,
   "end_elevation_m": 132.77628619815178,
   "start_xy": [
    722816.7985245311,
    4599042.262314606
   ],
   "end_xy": [
    722815.9024112708,
    4599040.474304252
   ]
  },
  "max_3m": {
   "gradient_pct": 27.321593265811355,
   "start_distance_m": 139.0,
   "end_distance_m": 142.0,
   "midpoint_distance_m": 140.5,
   "start_elevation_m": 131.95663840017744,
   "end_elevation_m": 132.77628619815178,
   "start_xy": [
    722817.2465811612,
    4599043.156319783
   ],
   "end_xy": [
    722815.9024112708,
    4599040.474304252
   ]
  }
 },
 "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"
  ],
  "suggested_summit_cut_m": 340.0,
  "trailing_descent_m": 5.9
 },
 "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_x72y460_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:37:01+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": [
   "x72y460"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.0% over 200 m (Terrain 50), gain 38.1 m over 481 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": "East Haddam",
  "county": "Connecticut"
 }
}