{
 "ocl_version": "0.1.0",
 "name": "Ansonia Road",
 "slug": "ansonia-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.532949655619916,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 113.0,
   "end_distance_m": 115.0,
   "start_elevation_m": 195.07120174462113,
   "end_elevation_m": 195.52186073773353,
   "min_gradient_pct": 1.539364990220804
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.066229747425343,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 112.0,
   "end_distance_m": 115.0,
   "start_elevation_m": 194.85987384531077,
   "end_elevation_m": 195.52186073773353,
   "min_gradient_pct": 1.7944379476877732
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.90254682637658,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 110.0,
   "end_distance_m": 115.0,
   "start_elevation_m": 194.4267333964147,
   "end_elevation_m": 195.52186073773353,
   "min_gradient_pct": 2.202143929949898
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.64375656217601,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 194.21367459219812,
   "end_elevation_m": 196.37805024841572,
   "min_gradient_pct": 4.815529255845092
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.282086987040714,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 102.0,
   "end_distance_m": 122.0,
   "start_elevation_m": 192.75203735417244,
   "end_elevation_m": 197.0084547515806,
   "min_gradient_pct": 7.165990432247469
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.194354378170374,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 102.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 192.75203735417244,
   "end_elevation_m": 198.05062594871504,
   "min_gradient_pct": 7.196342483957324
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.27093920357197,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 98.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 191.98147238378166,
   "end_elevation_m": 202.11694198556765,
   "min_gradient_pct": 7.734163111592352
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.252759485792467,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 72.0,
   "end_distance_m": 172.0,
   "start_elevation_m": 187.9710423590546,
   "end_elevation_m": 206.22380184484706,
   "min_gradient_pct": 9.00229585368541
  }
 ],
 "shape": {
  "ascent_concentration": 0.375,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "sustained"
 },
 "length_m": 380.5999999996839,
 "start_elevation_m": 180.73679172905065,
 "end_elevation_m": 227.87010435207347,
 "endpoint_gain_m": 47.13331262302282,
 "overall_gradient_pct": 12.383949717042029,
 "accumulated_ascent_m": 47.13331262302282,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.90254682637658,
   "start_distance_m": 110.0,
   "end_distance_m": 115.0,
   "midpoint_distance_m": 112.5,
   "start_elevation_m": 194.4267333964147,
   "end_elevation_m": 195.52186073773353,
   "start_xy": [
    622537.1353907821,
    4591343.646044425
   ],
   "end_xy": [
    622542.1032532,
    4591344.212028785
   ]
  },
  "max_10m": {
   "gradient_pct": 21.64375656217601,
   "start_distance_m": 109.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 114.0,
   "start_elevation_m": 194.21367459219812,
   "end_elevation_m": 196.37805024841572,
   "start_xy": [
    622536.1418033908,
    4591343.532977649
   ],
   "end_xy": [
    622546.0775283386,
    4591344.664946381
   ]
  },
  "max_20m": {
   "gradient_pct": 21.282086987040714,
   "start_distance_m": 102.0,
   "end_distance_m": 122.0,
   "midpoint_distance_m": 112.0,
   "start_elevation_m": 192.75203735417244,
   "end_elevation_m": 197.0084547515806,
   "start_xy": [
    622529.1868661471,
    4591342.739984783
   ],
   "end_xy": [
    622549.0583032434,
    4591345.004034778
   ]
  },
  "max_25m": {
   "gradient_pct": 21.194354378170374,
   "start_distance_m": 102.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 114.5,
   "start_elevation_m": 192.75203735417244,
   "end_elevation_m": 198.05062594871504,
   "start_xy": [
    622529.1868661471,
    4591342.739984783
   ],
   "end_xy": [
    622554.0260529737,
    4591345.571006022
   ]
  },
  "max_50m": {
   "gradient_pct": 20.27093920357197,
   "start_distance_m": 98.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 191.98147238378166,
   "end_elevation_m": 202.11694198556765,
   "start_xy": [
    622525.2126043094,
    4591342.286951385
   ],
   "end_xy": [
    622574.8910904848,
    4591347.948010286
   ]
  },
  "max_100m": {
   "gradient_pct": 18.252759485792467,
   "start_distance_m": 72.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 187.9710423590546,
   "end_elevation_m": 206.22380184484706,
   "start_xy": [
    622499.4336715846,
    4591338.90395663
   ],
   "end_xy": [
    622598.7368029781,
    4591350.664977602
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.202143929949898,
   "start_distance_m": 1.0,
   "end_distance_m": 6.0,
   "midpoint_distance_m": 3.5,
   "start_elevation_m": 180.76903004497882,
   "end_elevation_m": 180.87913724147631,
   "start_xy": [
    622429.0405052435,
    4591329.641066721
   ],
   "end_xy": [
    622433.9976946034,
    4591330.29395967
   ]
  },
  "min_10m": {
   "gradient_pct": 4.815529255845092,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 180.73679172905065,
   "end_elevation_m": 181.21834465463516,
   "start_xy": [
    622428.049,
    4591329.511
   ],
   "end_xy": [
    622437.9634910056,
    4591330.815932783
   ]
  },
  "min_20m": {
   "gradient_pct": 7.165990432247469,
   "start_distance_m": 291.0,
   "end_distance_m": 311.0,
   "midpoint_distance_m": 301.0,
   "start_elevation_m": 219.1093632333647,
   "end_elevation_m": 220.54256131981418,
   "start_xy": [
    622712.5100379966,
    4591339.825038083
   ],
   "end_xy": [
    622728.3325133978,
    4591327.602908056
   ]
  },
  "min_25m": {
   "gradient_pct": 7.196342483957324,
   "start_distance_m": 287.0,
   "end_distance_m": 312.0,
   "midpoint_distance_m": 299.5,
   "start_elevation_m": 218.81701986348506,
   "end_elevation_m": 220.6161054844744,
   "start_xy": [
    622709.2401725751,
    4591342.128943202
   ],
   "end_xy": [
    622729.1092654314,
    4591326.973101518
   ]
  },
  "min_50m": {
   "gradient_pct": 7.734163111592352,
   "start_distance_m": 279.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 304.0,
   "start_elevation_m": 218.18321970761784,
   "end_elevation_m": 222.050301263414,
   "start_xy": [
    622702.6938590468,
    4591346.727288567
   ],
   "end_xy": [
    622741.9920421697,
    4591315.893495108
   ]
  },
  "min_100m": {
   "gradient_pct": 9.00229585368541,
   "start_distance_m": 259.0,
   "end_distance_m": 359.0,
   "midpoint_distance_m": 309.0,
   "start_elevation_m": 216.15828271704302,
   "end_elevation_m": 225.16057857072843,
   "start_xy": [
    622684.9770625205,
    4591355.892787181
   ],
   "end_xy": [
    622764.1670230277,
    4591295.694322838
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.532949655619916,
   "start_distance_m": 113.0,
   "end_distance_m": 115.0,
   "midpoint_distance_m": 114.0,
   "start_elevation_m": 195.07120174462113,
   "end_elevation_m": 195.52186073773353,
   "start_xy": [
    622540.1160656523,
    4591343.986007463
   ],
   "end_xy": [
    622542.1032532,
    4591344.212028785
   ]
  },
  "max_3m": {
   "gradient_pct": 22.066229747425343,
   "start_distance_m": 112.0,
   "end_distance_m": 115.0,
   "midpoint_distance_m": 113.5,
   "start_elevation_m": 194.85987384531077,
   "end_elevation_m": 195.52186073773353,
   "start_xy": [
    622539.1225910949,
    4591343.871953515
   ],
   "end_xy": [
    622542.1032532,
    4591344.212028785
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.401,
   "obstruction_max_height_m": 22.91,
   "flagged_windows_m": [
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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_x62y460_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-08T14:01:15+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/connecticut-2026-08-23-batch.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "retro-box-260908",
  "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": [
   "x62y460"
  ],
  "route_cut_m": 380.6,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_CT_Sandy_2014_LAS_2015",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.997,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "New Fairfield",
  "county": "Connecticut"
 }
}