{
 "ocl_version": "0.1.0",
 "name": "Lakeview Terrace",
 "slug": "lakeview-terrace",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.014854974072563,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 143.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 52.262773167966266,
   "end_elevation_m": 52.72307026744772,
   "min_gradient_pct": -17.099535770043417
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.586358413008394,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 142.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 52.045479515057465,
   "end_elevation_m": 52.72307026744772,
   "min_gradient_pct": -13.195474913535085
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.871319335050288,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 51.6295043006952,
   "end_elevation_m": 52.72307026744772,
   "min_gradient_pct": -10.285872787116261
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.57065324882757,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 148.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 53.215183245604806,
   "end_elevation_m": 55.27224857048756,
   "min_gradient_pct": -8.548987566470032
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.1410180486004,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 139.0,
   "end_distance_m": 159.0,
   "start_elevation_m": 51.437089683876614,
   "end_elevation_m": 55.465293293596694,
   "min_gradient_pct": -7.126692928806619
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.0252075641597,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 153.0,
   "start_elevation_m": 49.27392385825638,
   "end_elevation_m": 54.28022574929631,
   "min_gradient_pct": -6.507615900528265
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.431971051900575,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 168.0,
   "start_elevation_m": 47.40828076062642,
   "end_elevation_m": 57.124266286576706,
   "min_gradient_pct": -5.554970154490718
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.584319729745246,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 110.0,
   "end_distance_m": 210.0,
   "start_elevation_m": 46.28903936686566,
   "end_elevation_m": 62.873359096610905,
   "min_gradient_pct": -3.99077493267464
  }
 ],
 "shape": {
  "ascent_concentration": 0.464,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "stepped"
 },
 "length_m": 2212.745240525221,
 "start_elevation_m": 39.56429829162373,
 "end_elevation_m": 127.58723854404109,
 "endpoint_gain_m": 88.02294025241736,
 "overall_gradient_pct": 3.9779970436869667,
 "accumulated_ascent_m": 101.13066138584125,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.871319335050288,
   "start_distance_m": 140.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 142.5,
   "start_elevation_m": 51.6295043006952,
   "end_elevation_m": 52.72307026744772,
   "start_xy": [
    648574.9029087758,
    4587805.0004507
   ],
   "end_xy": [
    648573.8952564026,
    4587800.1595444195
   ]
  },
  "max_10m": {
   "gradient_pct": 20.57065324882757,
   "start_distance_m": 148.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 153.0,
   "start_elevation_m": 53.215183245604806,
   "end_elevation_m": 55.27224857048756,
   "start_xy": [
    648571.33846035,
    4587798.590215281
   ],
   "end_xy": [
    648562.8158068411,
    4587793.359118152
   ]
  },
  "max_20m": {
   "gradient_pct": 20.1410180486004,
   "start_distance_m": 139.0,
   "end_distance_m": 159.0,
   "midpoint_distance_m": 149.0,
   "start_elevation_m": 51.437089683876614,
   "end_elevation_m": 55.465293293596694,
   "start_xy": [
    648575.0813950213,
    4587805.984393106
   ],
   "end_xy": [
    648561.9635414903,
    4587792.83600844
   ]
  },
  "max_25m": {
   "gradient_pct": 20.0252075641597,
   "start_distance_m": 128.0,
   "end_distance_m": 153.0,
   "midpoint_distance_m": 140.5,
   "start_elevation_m": 49.27392385825638,
   "end_elevation_m": 54.28022574929631,
   "start_xy": [
    648572.4907333717,
    4587816.00973542
   ],
   "end_xy": [
    648567.0771335955,
    4587795.9746667165
   ]
  },
  "max_50m": {
   "gradient_pct": 19.431971051900575,
   "start_distance_m": 118.0,
   "end_distance_m": 168.0,
   "midpoint_distance_m": 143.0,
   "start_elevation_m": 47.40828076062642,
   "end_elevation_m": 57.124266286576706,
   "start_xy": [
    648567.3524809101,
    4587824.587128499
   ],
   "end_xy": [
    648554.0551902688,
    4587788.56494838
   ]
  },
  "max_100m": {
   "gradient_pct": 16.584319729745246,
   "start_distance_m": 110.0,
   "end_distance_m": 210.0,
   "midpoint_distance_m": 160.0,
   "start_elevation_m": 46.28903936686566,
   "end_elevation_m": 62.873359096610905,
   "start_xy": [
    648563.1046576407,
    4587831.366213797
   ],
   "end_xy": [
    648514.5672838133,
    4587775.272536251
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.285872787116261,
   "start_distance_m": 1734.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1736.5,
   "start_elevation_m": 81.24119823638455,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647512.8635853067,
    4587017.024273824
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  },
  "min_10m": {
   "gradient_pct": -8.548987566470032,
   "start_distance_m": 1729.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1734.0,
   "start_elevation_m": 81.58180335367574,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647517.6723153276,
    4587018.232289616
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  },
  "min_20m": {
   "gradient_pct": -7.126692928806619,
   "start_distance_m": 1719.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1729.0,
   "start_elevation_m": 82.15224318279006,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647526.7166091782,
    4587022.498523171
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  },
  "min_25m": {
   "gradient_pct": -6.507615900528265,
   "start_distance_m": 1714.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1726.5,
   "start_elevation_m": 82.3538085721608,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647531.2363635843,
    4587024.636092986
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  },
  "min_50m": {
   "gradient_pct": -5.554970154490718,
   "start_distance_m": 1689.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1714.0,
   "start_elevation_m": 83.5043896742741,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647552.6107765504,
    4587037.602760652
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  },
  "min_100m": {
   "gradient_pct": -3.99077493267464,
   "start_distance_m": 1639.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1689.0,
   "start_elevation_m": 84.71767952970337,
   "end_elevation_m": 80.72690459702874,
   "start_xy": [
    647593.61226797,
    4587066.170585669
   ],
   "end_xy": [
    647508.2485188028,
    4587016.030065404
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.014854974072563,
   "start_distance_m": 143.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 144.0,
   "start_elevation_m": 52.262773167966266,
   "end_elevation_m": 52.72307026744772,
   "start_xy": [
    648574.3674500397,
    4587802.048623478
   ],
   "end_xy": [
    648573.8952564026,
    4587800.1595444195
   ]
  },
  "max_3m": {
   "gradient_pct": 22.586358413008394,
   "start_distance_m": 142.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 143.5,
   "start_elevation_m": 52.045479515057465,
   "end_elevation_m": 52.72307026744772,
   "start_xy": [
    648574.545936285,
    4587803.032565885
   ],
   "end_xy": [
    648573.8952564026,
    4587800.1595444195
   ]
  }
 },
 "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_x64y459_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T22:03:23+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": [
   "x64y459"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.3% over 200 m (Terrain 50), gain 41.9 m over 1739 m way. EXTENDED by graph walk: +0 segment(s) at base, +5 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": "Newtown",
  "county": "Connecticut"
 }
}