{
 "ocl_version": "0.1.0",
 "name": "Route 39",
 "slug": "route-39",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.130099144661642,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 28.0,
   "end_distance_m": 30.0,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 143.76091680445455,
   "min_gradient_pct": -11.932161343641212
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.428565664027172,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 28.0,
   "end_distance_m": 31.0,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 143.97117179148213,
   "min_gradient_pct": -11.676487094248955
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.071205233874593,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 28.0,
   "end_distance_m": 33.0,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 144.40187508325505,
   "min_gradient_pct": -10.948539355688354
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.36673535604558,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 24.0,
   "end_distance_m": 34.0,
   "start_elevation_m": 142.47385626338834,
   "end_elevation_m": 144.6105297989929,
   "min_gradient_pct": -9.54817667512117
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.418193689786648,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1481.0,
   "end_distance_m": 1501.0,
   "start_elevation_m": 219.6408788267166,
   "end_elevation_m": 223.72451756467393,
   "min_gradient_pct": -8.543020449993008
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.25439811259912,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1479.0,
   "end_distance_m": 1504.0,
   "start_elevation_m": 219.23479356461183,
   "end_elevation_m": 224.29839309276161,
   "min_gradient_pct": -7.5553447482004685
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.328781931407832,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 18.0,
   "end_distance_m": 68.0,
   "start_elevation_m": 141.3451629691849,
   "end_elevation_m": 150.00955393488883,
   "min_gradient_pct": -4.702797850297486
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.544372141343187,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 10.0,
   "end_distance_m": 110.0,
   "start_elevation_m": 140.28806790730872,
   "end_elevation_m": 154.8324400486519,
   "min_gradient_pct": -4.363882737283944
  }
 ],
 "shape": {
  "ascent_concentration": 0.329,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 84.0,
  "shape_class": "sustained"
 },
 "length_m": 1928.8226314545939,
 "start_elevation_m": 139.31760422699182,
 "end_elevation_m": 246.72248538131612,
 "endpoint_gain_m": 107.4048811543243,
 "overall_gradient_pct": 5.568416680870571,
 "accumulated_ascent_m": 116.76926177640087,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.071205233874593,
   "start_distance_m": 28.0,
   "end_distance_m": 33.0,
   "midpoint_distance_m": 30.5,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 144.40187508325505,
   "start_xy": [
    628468.3398369505,
    4593687.207473939
   ],
   "end_xy": [
    628463.3453231365,
    4593686.973312109
   ]
  },
  "max_10m": {
   "gradient_pct": 21.36673535604558,
   "start_distance_m": 24.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 142.47385626338834,
   "end_elevation_m": 144.6105297989929,
   "start_xy": [
    628472.3335151579,
    4593687.425758863
   ],
   "end_xy": [
    628462.3464203738,
    4593686.926479742
   ]
  },
  "max_20m": {
   "gradient_pct": 20.418193689786648,
   "start_distance_m": 1481.0,
   "end_distance_m": 1501.0,
   "midpoint_distance_m": 1491.0,
   "start_elevation_m": 219.6408788267166,
   "end_elevation_m": 223.72451756467393,
   "start_xy": [
    627894.8732112421,
    4592617.041228499
   ],
   "end_xy": [
    627879.389707937,
    4592629.666491083
   ]
  },
  "max_25m": {
   "gradient_pct": 20.25439811259912,
   "start_distance_m": 1479.0,
   "end_distance_m": 1504.0,
   "midpoint_distance_m": 1491.5,
   "start_elevation_m": 219.23479356461183,
   "end_elevation_m": 224.29839309276161,
   "start_xy": [
    627896.4447129623,
    4592615.804142268
   ],
   "end_xy": [
    627877.3207334117,
    4592631.838896297
   ]
  },
  "max_50m": {
   "gradient_pct": 17.328781931407832,
   "start_distance_m": 18.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 43.0,
   "start_elevation_m": 141.3451629691849,
   "end_elevation_m": 150.00955393488883,
   "start_xy": [
    628478.3153342549,
    4593687.892492503
   ],
   "end_xy": [
    628431.0168659328,
    4593693.952676763
   ]
  },
  "max_100m": {
   "gradient_pct": 14.544372141343187,
   "start_distance_m": 10.0,
   "end_distance_m": 110.0,
   "midpoint_distance_m": 60.0,
   "start_elevation_m": 140.28806790730872,
   "end_elevation_m": 154.8324400486519,
   "start_xy": [
    628486.2869303146,
    4593688.556739659
   ],
   "end_xy": [
    628402.2155834383,
    4593715.679820563
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.948539355688354,
   "start_distance_m": 233.0,
   "end_distance_m": 238.0,
   "midpoint_distance_m": 235.5,
   "start_elevation_m": 159.33255145344646,
   "end_elevation_m": 158.78512448566204,
   "start_xy": [
    628279.9963609258,
    4593726.64998031
   ],
   "end_xy": [
    628275.0364267724,
    4593727.281686883
   ]
  },
  "min_10m": {
   "gradient_pct": -9.54817667512117,
   "start_distance_m": 227.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 232.0,
   "start_elevation_m": 159.83735865249952,
   "end_elevation_m": 158.8825409849874,
   "start_xy": [
    628285.9482819098,
    4593725.891932423
   ],
   "end_xy": [
    628276.0284136031,
    4593727.155345568
   ]
  },
  "min_20m": {
   "gradient_pct": -8.543020449993008,
   "start_distance_m": 221.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 231.0,
   "start_elevation_m": 160.28724964763657,
   "end_elevation_m": 158.57864555763797,
   "start_xy": [
    628291.9002028939,
    4593725.133884536
   ],
   "end_xy": [
    628272.3048498902,
    4593726.255250724
   ]
  },
  "min_25m": {
   "gradient_pct": -7.5553447482004685,
   "start_distance_m": 217.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 229.5,
   "start_elevation_m": 160.41516807301755,
   "end_elevation_m": 158.52633188596744,
   "start_xy": [
    628295.8681502166,
    4593724.628519278
   ],
   "end_xy": [
    628271.4533554388,
    4593725.73088711
   ]
  },
  "min_50m": {
   "gradient_pct": -4.702797850297486,
   "start_distance_m": 441.0,
   "end_distance_m": 491.0,
   "midpoint_distance_m": 466.0,
   "start_elevation_m": 168.61667652539663,
   "end_elevation_m": 166.26527760024788,
   "start_xy": [
    628204.6949298822,
    4593562.962775117
   ],
   "end_xy": [
    628204.7126745812,
    4593512.969361948
   ]
  },
  "min_100m": {
   "gradient_pct": -4.363882737283944,
   "start_distance_m": 427.0,
   "end_distance_m": 527.0,
   "midpoint_distance_m": 477.0,
   "start_elevation_m": 169.22747370618714,
   "end_elevation_m": 164.8635909689032,
   "start_xy": [
    628204.3120305432,
    4593576.9575379975
   ],
   "end_xy": [
    628204.1878063653,
    4593476.977319056
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.130099144661642,
   "start_distance_m": 28.0,
   "end_distance_m": 30.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 143.76091680445455,
   "start_xy": [
    628468.3398369505,
    4593687.207473939
   ],
   "end_xy": [
    628466.342031425,
    4593687.1138092065
   ]
  },
  "max_3m": {
   "gradient_pct": 22.428565664027172,
   "start_distance_m": 28.0,
   "end_distance_m": 31.0,
   "midpoint_distance_m": 29.5,
   "start_elevation_m": 143.29831482156132,
   "end_elevation_m": 143.97117179148213,
   "start_xy": [
    628468.3398369505,
    4593687.207473939
   ],
   "end_xy": [
    628465.3431286621,
    4593687.066976841
   ]
  }
 },
 "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": 0.476,
   "obstruction_max_height_m": 33.87,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    25,
    50,
    100
   ]
  },
  "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_x62y460_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-04T19:12:05+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": "us-hs-bench-260904",
  "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"
  ],
  "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": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "New Fairfield",
  "county": "Connecticut"
 }
}