{
 "ocl_version": "0.1.0",
 "name": "Howland Street",
 "slug": "howland-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.163633852121905,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 81.0,
   "end_distance_m": 83.0,
   "start_elevation_m": 131.81155314219927,
   "end_elevation_m": 132.3548258192417,
   "min_gradient_pct": -2.430899914048723
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.797405960533638,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 80.0,
   "end_distance_m": 83.0,
   "start_elevation_m": 131.5509036404257,
   "end_elevation_m": 132.3548258192417,
   "min_gradient_pct": -2.042248910643707
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.565201275068375,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 80.0,
   "end_distance_m": 85.0,
   "start_elevation_m": 131.5509036404257,
   "end_elevation_m": 132.87916370417912,
   "min_gradient_pct": -1.3860639151374698
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.056918436787043,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 79.0,
   "end_distance_m": 89.0,
   "start_elevation_m": 131.29522467811833,
   "end_elevation_m": 133.80091652179703,
   "min_gradient_pct": 0.6564940830119781
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.25796549625045,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 78.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 131.10156034717292,
   "end_elevation_m": 135.553153446423,
   "min_gradient_pct": 2.085080599610336
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.236073746892203,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 78.0,
   "end_distance_m": 103.0,
   "start_elevation_m": 131.10156034717292,
   "end_elevation_m": 136.41057878389597,
   "min_gradient_pct": 2.873888391576088
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.345585760354936,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 76.0,
   "end_distance_m": 126.0,
   "start_elevation_m": 130.79826521263178,
   "end_elevation_m": 139.97105809280924,
   "min_gradient_pct": 7.253875474171991
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.222915416898813,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 76.0,
   "end_distance_m": 176.0,
   "start_elevation_m": 130.79826521263178,
   "end_elevation_m": 145.0211806295306,
   "min_gradient_pct": 10.010636959913711
  }
 ],
 "shape": {
  "ascent_concentration": 0.397,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 77.0,
  "shape_class": "sustained"
 },
 "length_m": 246.9752673664318,
 "start_elevation_m": 125.89470456428597,
 "end_elevation_m": 152.83510173503217,
 "endpoint_gain_m": 26.940397170746195,
 "overall_gradient_pct": 10.908135643710152,
 "accumulated_ascent_m": 27.04931329137753,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.565201275068375,
   "start_distance_m": 80.0,
   "end_distance_m": 85.0,
   "midpoint_distance_m": 82.5,
   "start_elevation_m": 131.5509036404257,
   "end_elevation_m": 132.87916370417912,
   "start_xy": [
    660445.5010932822,
    4606883.857829702
   ],
   "end_xy": [
    660450.2133744701,
    4606882.18618201
   ]
  },
  "max_10m": {
   "gradient_pct": 25.056918436787043,
   "start_distance_m": 79.0,
   "end_distance_m": 89.0,
   "midpoint_distance_m": 84.0,
   "start_elevation_m": 131.29522467811833,
   "end_elevation_m": 133.80091652179703,
   "start_xy": [
    660444.5586370446,
    4606884.19215924
   ],
   "end_xy": [
    660453.9831994205,
    4606880.848863857
   ]
  },
  "max_20m": {
   "gradient_pct": 22.25796549625045,
   "start_distance_m": 78.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 88.0,
   "start_elevation_m": 131.10156034717292,
   "end_elevation_m": 135.553153446423,
   "start_xy": [
    660443.616180807,
    4606884.526488779
   ],
   "end_xy": [
    660462.4653055588,
    4606877.839898011
   ]
  },
  "max_25m": {
   "gradient_pct": 21.236073746892203,
   "start_distance_m": 78.0,
   "end_distance_m": 103.0,
   "midpoint_distance_m": 90.5,
   "start_elevation_m": 131.10156034717292,
   "end_elevation_m": 136.41057878389597,
   "start_xy": [
    660443.616180807,
    4606884.526488779
   ],
   "end_xy": [
    660467.1775867468,
    4606876.16825032
   ]
  },
  "max_50m": {
   "gradient_pct": 18.345585760354936,
   "start_distance_m": 76.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 101.0,
   "start_elevation_m": 130.79826521263178,
   "end_elevation_m": 139.97105809280924,
   "start_xy": [
    660441.7312683319,
    4606885.195147855
   ],
   "end_xy": [
    660488.8540802113,
    4606868.478670937
   ]
  },
  "max_100m": {
   "gradient_pct": 14.222915416898813,
   "start_distance_m": 76.0,
   "end_distance_m": 176.0,
   "midpoint_distance_m": 126.0,
   "start_elevation_m": 130.79826521263178,
   "end_elevation_m": 145.0211806295306,
   "start_xy": [
    660441.7312683319,
    4606885.195147855
   ],
   "end_xy": [
    660536.156507508,
    4606852.282503045
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.3860639151374698,
   "start_distance_m": 69.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 71.5,
   "start_elevation_m": 130.73877418543762,
   "end_elevation_m": 130.66947098968075,
   "start_xy": [
    660435.1449363433,
    4606887.562741584
   ],
   "end_xy": [
    660439.8463558566,
    4606885.863806932
   ]
  },
  "min_10m": {
   "gradient_pct": 0.6564940830119781,
   "start_distance_m": 65.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 70.0,
   "start_elevation_m": 130.63297423910808,
   "end_elevation_m": 130.69862364740928,
   "start_xy": [
    660431.4873168451,
    4606889.18194497
   ],
   "end_xy": [
    660440.7888120943,
    4606885.529477394
   ]
  },
  "min_20m": {
   "gradient_pct": 2.085080599610336,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 125.89470456428597,
   "end_elevation_m": 126.31172068420804,
   "start_xy": [
    660372.051,
    4606915.494
   ],
   "end_xy": [
    660390.3390974908,
    4606907.397983068
   ]
  },
  "min_25m": {
   "gradient_pct": 2.873888391576088,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 125.89470456428597,
   "end_elevation_m": 126.61317666218,
   "start_xy": [
    660372.051,
    4606915.494
   ],
   "end_xy": [
    660394.9111218635,
    4606905.373978835
   ]
  },
  "min_50m": {
   "gradient_pct": 7.253875474171991,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 125.89470456428597,
   "end_elevation_m": 129.52164230137197,
   "start_xy": [
    660372.051,
    4606915.494
   ],
   "end_xy": [
    660417.7712437271,
    4606895.253957669
   ]
  },
  "min_100m": {
   "gradient_pct": 10.010636959913711,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 125.89470456428597,
   "end_elevation_m": 135.90534152419968,
   "start_xy": [
    660372.051,
    4606915.494
   ],
   "end_xy": [
    660464.350218034,
    4606877.171238935
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.163633852121905,
   "start_distance_m": 81.0,
   "end_distance_m": 83.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 131.81155314219927,
   "end_elevation_m": 132.3548258192417,
   "start_xy": [
    660446.4435495198,
    4606883.523500163
   ],
   "end_xy": [
    660448.328461995,
    4606882.854841087
   ]
  },
  "max_3m": {
   "gradient_pct": 26.797405960533638,
   "start_distance_m": 80.0,
   "end_distance_m": 83.0,
   "midpoint_distance_m": 81.5,
   "start_elevation_m": 131.5509036404257,
   "end_elevation_m": 132.3548258192417,
   "start_xy": [
    660445.5010932822,
    4606883.857829702
   ],
   "end_xy": [
    660448.328461995,
    4606882.854841087
   ]
  }
 },
 "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_continue_beyond_end"
  ]
 },
 "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_x66y461_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:55:12+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-2-260824",
  "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": [
   "x66y461"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.1% over 200 m (Terrain 50), gain 22.2 m over 178 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": "Watertown",
  "county": "Connecticut"
 }
}