{
 "ocl_version": "0.1.0",
 "name": "Flax Hill Road",
 "slug": "flax-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.15125012452779,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 323.0,
   "end_distance_m": 325.0,
   "start_elevation_m": 90.40733347409446,
   "end_elevation_m": 90.93035847658501,
   "min_gradient_pct": -11.007413275496702
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.65607542273322,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 322.0,
   "end_distance_m": 325.0,
   "start_elevation_m": 90.16067621390302,
   "end_elevation_m": 90.93035847658501,
   "min_gradient_pct": -10.842108458296215
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.228957095752378,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 323.0,
   "end_distance_m": 328.0,
   "start_elevation_m": 90.40733347409446,
   "end_elevation_m": 91.66878132888208,
   "min_gradient_pct": -10.665750169250146
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.655626539989868,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 318.0,
   "end_distance_m": 328.0,
   "start_elevation_m": 89.20321867488309,
   "end_elevation_m": 91.66878132888208,
   "min_gradient_pct": -10.343515280199682
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.485267659577573,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 309.0,
   "end_distance_m": 329.0,
   "start_elevation_m": 87.19713685103304,
   "end_elevation_m": 91.89419038294855,
   "min_gradient_pct": -10.07893809008543
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.18945353098411,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 304.0,
   "end_distance_m": 329.0,
   "start_elevation_m": 86.09682700020252,
   "end_elevation_m": 91.89419038294855,
   "min_gradient_pct": -9.823063267076066
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.867849427281158,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 286.0,
   "end_distance_m": 336.0,
   "start_elevation_m": 82.36188575620012,
   "end_elevation_m": 93.2958104698407,
   "min_gradient_pct": -8.584108419847496
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.183893794955694,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 254.0,
   "end_distance_m": 354.0,
   "start_elevation_m": 77.10330287420824,
   "end_elevation_m": 96.28719666916393,
   "min_gradient_pct": -6.7810494224144255
  }
 ],
 "shape": {
  "ascent_concentration": 0.434,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 305.0,
  "shape_class": "sustained"
 },
 "length_m": 1640.000000000369,
 "start_elevation_m": 81.00519786383548,
 "end_elevation_m": 199.82139938023698,
 "endpoint_gain_m": 118.8162015164015,
 "overall_gradient_pct": 7.244890336364315,
 "accumulated_ascent_m": 127.3565998018003,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.228957095752378,
   "start_distance_m": 323.0,
   "end_distance_m": 328.0,
   "midpoint_distance_m": 325.5,
   "start_elevation_m": 90.40733347409446,
   "end_elevation_m": 91.66878132888208,
   "start_xy": [
    631915.8629799893,
    4593879.798960825
   ],
   "end_xy": [
    631910.888352313,
    4593880.30202454
   ]
  },
  "max_10m": {
   "gradient_pct": 24.655626539989868,
   "start_distance_m": 318.0,
   "end_distance_m": 328.0,
   "midpoint_distance_m": 323.0,
   "start_elevation_m": 89.20321867488309,
   "end_elevation_m": 91.66878132888208,
   "start_xy": [
    631920.8376139118,
    4593879.295958402
   ],
   "end_xy": [
    631910.888352313,
    4593880.30202454
   ]
  },
  "max_20m": {
   "gradient_pct": 23.485267659577573,
   "start_distance_m": 309.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 319.0,
   "start_elevation_m": 87.19713685103304,
   "end_elevation_m": 91.89419038294855,
   "start_xy": [
    631929.7353411963,
    4593879.232447199
   ],
   "end_xy": [
    631909.8972934716,
    4593880.416440949
   ]
  },
  "max_25m": {
   "gradient_pct": 23.18945353098411,
   "start_distance_m": 304.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 316.5,
   "start_elevation_m": 86.09682700020252,
   "end_elevation_m": 91.89419038294855,
   "start_xy": [
    631934.5552095773,
    4593880.562435423
   ],
   "end_xy": [
    631909.8972934716,
    4593880.416440949
   ]
  },
  "max_50m": {
   "gradient_pct": 21.867849427281158,
   "start_distance_m": 286.0,
   "end_distance_m": 336.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 82.36188575620012,
   "end_elevation_m": 93.2958104698407,
   "start_xy": [
    631950.5650132402,
    4593888.381797299
   ],
   "end_xy": [
    631904.268926687,
    4593884.549689891
   ]
  },
  "max_100m": {
   "gradient_pct": 19.183893794955694,
   "start_distance_m": 254.0,
   "end_distance_m": 354.0,
   "midpoint_distance_m": 304.0,
   "start_elevation_m": 77.10330287420824,
   "end_elevation_m": 96.28719666916393,
   "start_xy": [
    631977.544251985,
    4593905.589949665
   ],
   "end_xy": [
    631890.458965074,
    4593896.05795581
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.665750169250146,
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 111.5,
   "start_elevation_m": 76.40695081001499,
   "end_elevation_m": 75.87366330155248,
   "start_xy": [
    632115.1442045008,
    4593892.134297811
   ],
   "end_xy": [
    632110.1872223683,
    4593892.774458718
   ]
  },
  "min_10m": {
   "gradient_pct": -10.343515280199682,
   "start_distance_m": 108.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 113.0,
   "start_elevation_m": 76.50459460553579,
   "end_elevation_m": 75.47024307751582,
   "start_xy": [
    632116.1385665461,
    4593892.028259503
   ],
   "end_xy": [
    632106.2407049988,
    4593893.426379397
   ]
  },
  "min_20m": {
   "gradient_pct": -10.07893809008543,
   "start_distance_m": 99.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 109.0,
   "start_elevation_m": 77.39053341743492,
   "end_elevation_m": 75.37474579941784,
   "start_xy": [
    632125.0877524525,
    4593891.073239678
   ],
   "end_xy": [
    632105.2540955009,
    4593893.589479669
   ]
  },
  "min_25m": {
   "gradient_pct": -9.823063267076066,
   "start_distance_m": 95.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 107.5,
   "start_elevation_m": 77.74233401284037,
   "end_elevation_m": 75.28656819607136,
   "start_xy": [
    632129.0573031617,
    4593890.582356135
   ],
   "end_xy": [
    632104.267459571,
    4593893.75241997
   ]
  },
  "min_50m": {
   "gradient_pct": -8.584108419847496,
   "start_distance_m": 83.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 108.0,
   "start_elevation_m": 78.57054775070692,
   "end_elevation_m": 74.27849354078317,
   "start_xy": [
    632140.9084306656,
    4593888.762387889
   ],
   "end_xy": [
    632091.5253830898,
    4593896.311570523
   ]
  },
  "min_100m": {
   "gradient_pct": -6.7810494224144255,
   "start_distance_m": 58.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 108.0,
   "start_elevation_m": 79.74178456078312,
   "end_elevation_m": 72.96073513836869,
   "start_xy": [
    632164.794692604,
    4593881.480128554
   ],
   "end_xy": [
    632067.8004371726,
    4593904.067454372
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.15125012452779,
   "start_distance_m": 323.0,
   "end_distance_m": 325.0,
   "midpoint_distance_m": 324.0,
   "start_elevation_m": 90.40733347409446,
   "end_elevation_m": 90.93035847658501,
   "start_xy": [
    631915.8629799893,
    4593879.798960825
   ],
   "end_xy": [
    631913.8731052405,
    4593879.999952083
   ]
  },
  "max_3m": {
   "gradient_pct": 25.65607542273322,
   "start_distance_m": 322.0,
   "end_distance_m": 325.0,
   "midpoint_distance_m": 323.5,
   "start_elevation_m": 90.16067621390302,
   "end_elevation_m": 90.93035847658501,
   "start_xy": [
    631916.8578675733,
    4593879.697972236
   ],
   "end_xy": [
    631913.8731052405,
    4593879.999952083
   ]
  }
 },
 "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": 0.185,
   "obstruction_max_height_m": 35.3,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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_x63y460_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-03T22:40:26+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": "extent-trim-v2-260903",
  "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": [
   "x63y460"
  ],
  "route_cut_m": 1640.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/CT_Statewide_B3_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.998,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Brookfield",
  "county": "Connecticut"
 }
}