{
 "ocl_version": "0.1.0",
 "name": "Willis Street",
 "slug": "willis-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 17.225267489483542,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 311.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 126.75095348134745,
   "end_elevation_m": 127.09545883113712,
   "min_gradient_pct": -10.946011047775528
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 17.17197070017799,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 279.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 121.3364435727773,
   "end_elevation_m": 121.85160269378264,
   "min_gradient_pct": -10.885465421411785
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 17.118034831950126,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 308.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 126.23955708953962,
   "end_elevation_m": 127.09545883113712,
   "min_gradient_pct": -10.673429356247652
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 17.08200781079256,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 302.0,
   "end_distance_m": 312.0,
   "start_elevation_m": 125.21765803036249,
   "end_elevation_m": 126.92585881144174,
   "min_gradient_pct": -10.359634760306449
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.968394585591398,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 301.0,
   "end_distance_m": 321.0,
   "start_elevation_m": 125.05072889364928,
   "end_elevation_m": 128.44440781076756,
   "min_gradient_pct": -10.133752050967075
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.935051590137164,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 296.0,
   "end_distance_m": 321.0,
   "start_elevation_m": 124.21064491323327,
   "end_elevation_m": 128.44440781076756,
   "min_gradient_pct": -10.028849617716332
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.886240239119218,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 274.0,
   "end_distance_m": 324.0,
   "start_elevation_m": 120.50131423844945,
   "end_elevation_m": 128.94443435800906,
   "min_gradient_pct": -9.688067043251294
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.430406628940005,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 247.0,
   "end_distance_m": 347.0,
   "start_elevation_m": 116.15062997198763,
   "end_elevation_m": 132.58103660092763,
   "min_gradient_pct": -8.614960120613773
  }
 ],
 "shape": {
  "ascent_concentration": 0.393,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 365.0,
  "shape_class": "sustained"
 },
 "length_m": 3026.9235457840214,
 "start_elevation_m": 89.04627392959299,
 "end_elevation_m": 282.43142228757176,
 "endpoint_gain_m": 193.38514835797878,
 "overall_gradient_pct": 6.3888349154814525,
 "accumulated_ascent_m": 221.57088977959614,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 17.118034831950126,
   "start_distance_m": 308.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 310.5,
   "start_elevation_m": 126.23955708953962,
   "end_elevation_m": 127.09545883113712,
   "start_xy": [
    671590.6636966899,
    4614665.057476342
   ],
   "end_xy": [
    671591.2351269439,
    4614660.090236921
   ]
  },
  "max_10m": {
   "gradient_pct": 17.08200781079256,
   "start_distance_m": 302.0,
   "end_distance_m": 312.0,
   "midpoint_distance_m": 307.0,
   "start_elevation_m": 125.21765803036249,
   "end_elevation_m": 126.92585881144174,
   "start_xy": [
    671589.9779803852,
    4614671.018163647
   ],
   "end_xy": [
    671591.1208408931,
    4614661.083684805
   ]
  },
  "max_20m": {
   "gradient_pct": 16.968394585591398,
   "start_distance_m": 301.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 125.05072889364928,
   "end_elevation_m": 128.44440781076756,
   "start_xy": [
    671589.8636943344,
    4614672.011611531
   ],
   "end_xy": [
    671592.1494153503,
    4614652.142653847
   ]
  },
  "max_25m": {
   "gradient_pct": 16.935051590137164,
   "start_distance_m": 296.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 308.5,
   "start_elevation_m": 124.21064491323327,
   "end_elevation_m": 128.44440781076756,
   "start_xy": [
    671589.2922640804,
    4614676.978850952
   ],
   "end_xy": [
    671592.1494153503,
    4614652.142653847
   ]
  },
  "max_50m": {
   "gradient_pct": 16.886240239119218,
   "start_distance_m": 274.0,
   "end_distance_m": 324.0,
   "midpoint_distance_m": 299.0,
   "start_elevation_m": 120.50131423844945,
   "end_elevation_m": 128.94443435800906,
   "start_xy": [
    671586.7076276405,
    4614698.826173894
   ],
   "end_xy": [
    671592.4922735026,
    4614649.162310195
   ]
  },
  "max_100m": {
   "gradient_pct": 16.430406628940005,
   "start_distance_m": 247.0,
   "end_distance_m": 347.0,
   "midpoint_distance_m": 297.0,
   "start_elevation_m": 116.15062997198763,
   "end_elevation_m": 132.58103660092763,
   "start_xy": [
    671583.2925408847,
    4614725.609324987
   ],
   "end_xy": [
    671595.3761807001,
    4614626.345386953
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.673429356247652,
   "start_distance_m": 2615.0,
   "end_distance_m": 2620.0,
   "midpoint_distance_m": 2617.5,
   "start_elevation_m": 297.56540020820864,
   "end_elevation_m": 297.03172874039626,
   "start_xy": [
    670971.471119478,
    4612592.750868787
   ],
   "end_xy": [
    670971.1244650115,
    4612587.763431095
   ]
  },
  "min_10m": {
   "gradient_pct": -10.359634760306449,
   "start_distance_m": 2615.0,
   "end_distance_m": 2625.0,
   "midpoint_distance_m": 2620.0,
   "start_elevation_m": 297.56540020820864,
   "end_elevation_m": 296.529436732178,
   "start_xy": [
    670971.471119478,
    4612592.750868787
   ],
   "end_xy": [
    670970.5491819655,
    4612582.796636412
   ]
  },
  "min_20m": {
   "gradient_pct": -10.133752050967075,
   "start_distance_m": 2610.0,
   "end_distance_m": 2630.0,
   "midpoint_distance_m": 2620.0,
   "start_elevation_m": 298.05850553483486,
   "end_elevation_m": 296.03175512464145,
   "start_xy": [
    670971.7947972933,
    4612597.740381055
   ],
   "end_xy": [
    670969.9738989195,
    4612577.829841729
   ]
  },
  "min_25m": {
   "gradient_pct": -10.028849617716332,
   "start_distance_m": 2612.0,
   "end_distance_m": 2637.0,
   "midpoint_distance_m": 2624.5,
   "start_elevation_m": 297.8640221056054,
   "end_elevation_m": 295.3568097011763,
   "start_xy": [
    670971.6653261671,
    4612595.744576148
   ],
   "end_xy": [
    670969.1685026552,
    4612570.876329174
   ]
  },
  "min_50m": {
   "gradient_pct": -9.688067043251294,
   "start_distance_m": 2606.0,
   "end_distance_m": 2656.0,
   "midpoint_distance_m": 2631.0,
   "start_elevation_m": 298.42498155667505,
   "end_elevation_m": 293.5809480350494,
   "start_xy": [
    670972.0537395454,
    4612601.731990869
   ],
   "end_xy": [
    670966.2564791129,
    4612552.101293387
   ]
  },
  "min_100m": {
   "gradient_pct": -8.614960120613773,
   "start_distance_m": 2598.0,
   "end_distance_m": 2698.0,
   "midpoint_distance_m": 2648.0,
   "start_elevation_m": 299.00911220446017,
   "end_elevation_m": 290.3941520838464,
   "start_xy": [
    670972.5716240498,
    4612609.715210497
   ],
   "end_xy": [
    670959.7651118296,
    4612510.605966532
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 17.225267489483542,
   "start_distance_m": 311.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 312.0,
   "start_elevation_m": 126.75095348134745,
   "end_elevation_m": 127.09545883113712,
   "start_xy": [
    671591.0065548423,
    4614662.077132689
   ],
   "end_xy": [
    671591.2351269439,
    4614660.090236921
   ]
  },
  "max_3m": {
   "gradient_pct": 17.17197070017799,
   "start_distance_m": 279.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 280.5,
   "start_elevation_m": 121.3364435727773,
   "end_elevation_m": 121.85160269378264,
   "start_xy": [
    671587.3400511137,
    4614693.8663310995
   ],
   "end_xy": [
    671587.6922593693,
    4614690.887121331
   ]
  }
 },
 "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": [],
  "suggested_summit_cut_m": 2402.0,
  "trailing_descent_m": 26.0
 },
 "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_x67y462_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:41:14+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": [
   "x67y462"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.8% over 200 m (Terrain 50), gain 193.7 m over 3027 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-41-6565-72-9364 ADOPTED (NE wave 1, 2026-08-25): big-gain. 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": "Bristol",
  "county": "Connecticut"
 }
}