{
 "ocl_version": "0.1.0",
 "name": "Quaddick Mountain Road",
 "slug": "quaddick-mountain-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.93323400476032,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 451.0,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 126.26287028477354,
   "min_gradient_pct": -31.86567249004213
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.73740627748962,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 452.0,
   "end_distance_m": 455.0,
   "start_elevation_m": 126.56858686467113,
   "end_elevation_m": 127.76070905299582,
   "min_gradient_pct": -28.82241216751235
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 39.13553760697738,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 454.0,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 127.3809824850272,
   "min_gradient_pct": -22.97547007409719
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 35.92281209762902,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 459.0,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 129.01648681444124,
   "min_gradient_pct": -14.079439030594187
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.449956768411994,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 631.0,
   "end_distance_m": 651.0,
   "start_elevation_m": 131.9283849741813,
   "end_elevation_m": 136.4183763278637,
   "min_gradient_pct": -11.422419993315316
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.230009041166113,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 639.0,
   "end_distance_m": 664.0,
   "start_elevation_m": 133.68618693103468,
   "end_elevation_m": 139.2436891913262,
   "min_gradient_pct": -11.312271065606865
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.658995657871348,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 630.0,
   "end_distance_m": 680.0,
   "start_elevation_m": 131.75733265927488,
   "end_elevation_m": 142.08683048821055,
   "min_gradient_pct": -9.808627139884834
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.117648108154413,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 630.0,
   "end_distance_m": 730.0,
   "start_elevation_m": 131.75733265927488,
   "end_elevation_m": 149.8749807674293,
   "min_gradient_pct": -7.1116668565054795
  }
 ],
 "shape": {
  "ascent_concentration": 0.58,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 155.0,
  "shape_class": "stepped"
 },
 "length_m": 1191.7790370688544,
 "start_elevation_m": 134.5195175720255,
 "end_elevation_m": 168.16386566771794,
 "endpoint_gain_m": 33.644348095692436,
 "overall_gradient_pct": 2.823035734748257,
 "accumulated_ascent_m": 55.506075360823985,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 39.13553760697738,
   "start_distance_m": 449.0,
   "end_distance_m": 454.0,
   "midpoint_distance_m": 451.5,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 127.3809824850272,
   "start_xy": [
    265603.9578593015,
    4647984.475683644
   ],
   "end_xy": [
    265602.7555189152,
    4647989.328968882
   ]
  },
  "max_10m": {
   "gradient_pct": 35.92281209762902,
   "start_distance_m": 449.0,
   "end_distance_m": 459.0,
   "midpoint_distance_m": 454.0,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 129.01648681444124,
   "start_xy": [
    265603.9578593015,
    4647984.475683644
   ],
   "end_xy": [
    265601.55317852896,
    4647994.182254119
   ]
  },
  "max_20m": {
   "gradient_pct": 22.449956768411994,
   "start_distance_m": 631.0,
   "end_distance_m": 651.0,
   "midpoint_distance_m": 641.0,
   "start_elevation_m": 131.9283849741813,
   "end_elevation_m": 136.4183763278637,
   "start_xy": [
    265607.9137612061,
    4648165.466627046
   ],
   "end_xy": [
    265607.0016951707,
    4648185.44581961
   ]
  },
  "max_25m": {
   "gradient_pct": 22.230009041166113,
   "start_distance_m": 639.0,
   "end_distance_m": 664.0,
   "midpoint_distance_m": 651.5,
   "start_elevation_m": 133.68618693103468,
   "end_elevation_m": 139.2436891913262,
   "start_xy": [
    265607.54893479194,
    4648173.458304071
   ],
   "end_xy": [
    265606.15074596246,
    4648198.413928708
   ]
  },
  "max_50m": {
   "gradient_pct": 20.658995657871348,
   "start_distance_m": 630.0,
   "end_distance_m": 680.0,
   "midpoint_distance_m": 655.0,
   "start_elevation_m": 131.75733265927488,
   "end_elevation_m": 142.08683048821055,
   "start_xy": [
    265607.9593645079,
    4648164.467667417
   ],
   "end_xy": [
    265604.60985124524,
    4648214.339557218
   ]
  },
  "max_100m": {
   "gradient_pct": 18.117648108154413,
   "start_distance_m": 630.0,
   "end_distance_m": 730.0,
   "midpoint_distance_m": 680.0,
   "start_elevation_m": 131.75733265927488,
   "end_elevation_m": 149.8749807674293,
   "start_xy": [
    265607.9593645079,
    4648164.467667417
   ],
   "end_xy": [
    265593.53550155106,
    4648260.081950359
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -22.97547007409719,
   "start_distance_m": 512.0,
   "end_distance_m": 517.0,
   "midpoint_distance_m": 514.5,
   "start_elevation_m": 128.35806983012588,
   "end_elevation_m": 127.20929632642103,
   "start_xy": [
    265601.1309781551,
    4648046.991891411
   ],
   "end_xy": [
    265601.4670875933,
    4648051.9805816645
   ]
  },
  "min_10m": {
   "gradient_pct": -14.079439030594187,
   "start_distance_m": 508.0,
   "end_distance_m": 518.0,
   "midpoint_distance_m": 513.0,
   "start_elevation_m": 128.56824300072682,
   "end_elevation_m": 127.1602990976674,
   "start_xy": [
    265600.86209060455,
    4648043.000939208
   ],
   "end_xy": [
    265601.5343094809,
    4648052.978319715
   ]
  },
  "min_20m": {
   "gradient_pct": -11.422419993315316,
   "start_distance_m": 158.0,
   "end_distance_m": 178.0,
   "midpoint_distance_m": 168.0,
   "start_elevation_m": 134.8874977524896,
   "end_elevation_m": 132.60301375382653,
   "start_xy": [
    265566.7194909136,
    4647699.850167234
   ],
   "end_xy": [
    265573.18002557504,
    4647718.77796404
   ]
  },
  "min_25m": {
   "gradient_pct": -11.312271065606865,
   "start_distance_m": 155.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 167.5,
   "start_elevation_m": 135.2330132961142,
   "end_elevation_m": 132.40494552971248,
   "start_xy": [
    265565.7504107144,
    4647697.010997714
   ],
   "end_xy": [
    265573.8260790412,
    4647720.67074372
   ]
  },
  "min_50m": {
   "gradient_pct": -9.808627139884834,
   "start_distance_m": 139.0,
   "end_distance_m": 189.0,
   "midpoint_distance_m": 164.0,
   "start_elevation_m": 136.6970625401316,
   "end_elevation_m": 131.7927489701892,
   "start_xy": [
    265560.5819829853,
    4647681.86876027
   ],
   "end_xy": [
    265576.38260943413,
    4647729.299867996
   ]
  },
  "min_100m": {
   "gradient_pct": -7.1116668565054795,
   "start_distance_m": 140.0,
   "end_distance_m": 240.0,
   "midpoint_distance_m": 190.0,
   "start_elevation_m": 136.65208230158873,
   "end_elevation_m": 129.54041544508326,
   "start_xy": [
    265560.9050097184,
    4647682.81515011
   ],
   "end_xy": [
    265590.8348933595,
    4647778.2092892695
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.93323400476032,
   "start_distance_m": 449.0,
   "end_distance_m": 451.0,
   "midpoint_distance_m": 450.0,
   "start_elevation_m": 125.42420560467833,
   "end_elevation_m": 126.26287028477354,
   "start_xy": [
    265603.9578593015,
    4647984.475683644
   ],
   "end_xy": [
    265603.4769231469,
    4647986.416997739
   ]
  },
  "max_3m": {
   "gradient_pct": 39.73740627748962,
   "start_distance_m": 452.0,
   "end_distance_m": 455.0,
   "midpoint_distance_m": 453.5,
   "start_elevation_m": 126.56858686467113,
   "end_elevation_m": 127.76070905299582,
   "start_xy": [
    265603.2364550697,
    4647987.387654787
   ],
   "end_xy": [
    265602.51505083794,
    4647990.299625929
   ]
  }
 },
 "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": 1083.0,
  "trailing_descent_m": 3.2
 },
 "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/ct-east/USGS_1M_19_x26y465_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:49:23+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": [
   "x26y465"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.5% over 200 m (Terrain 50), gain 33.9 m over 1192 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": "Thompson",
  "county": "Connecticut"
 }
}