{
 "ocl_version": "0.1.0",
 "name": "Calhoun Hill Road",
 "slug": "calhoun-hill-road-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.906197465905564,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 40.0,
   "end_distance_m": 42.0,
   "start_elevation_m": 182.12016273173512,
   "end_elevation_m": 182.55828668105323,
   "min_gradient_pct": -2.4904724071632245
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.565251973114187,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 40.0,
   "end_distance_m": 43.0,
   "start_elevation_m": 182.12016273173512,
   "end_elevation_m": 182.79712029092855,
   "min_gradient_pct": -2.357955729422656
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 20.89404565065479,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1121.0,
   "end_distance_m": 1126.0,
   "start_elevation_m": 295.9367210780398,
   "end_elevation_m": 296.98142336057253,
   "min_gradient_pct": -2.175447819930696
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.571842206185806,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1117.0,
   "end_distance_m": 1127.0,
   "start_elevation_m": 295.13075985083316,
   "end_elevation_m": 297.18794407145174,
   "min_gradient_pct": -1.9325730044704414
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.171040696737634,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1107.0,
   "end_distance_m": 1127.0,
   "start_elevation_m": 293.1537359321042,
   "end_elevation_m": 297.18794407145174,
   "min_gradient_pct": -1.7248620178708052
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.119535507575165,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1101.0,
   "end_distance_m": 1126.0,
   "start_elevation_m": 291.95153948367874,
   "end_elevation_m": 296.98142336057253,
   "min_gradient_pct": -1.5090106578463747
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.29849472049557,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1077.0,
   "end_distance_m": 1127.0,
   "start_elevation_m": 287.53869671120395,
   "end_elevation_m": 297.18794407145174,
   "min_gradient_pct": -0.7358999761366931
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.681380014161675,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1033.0,
   "end_distance_m": 1133.0,
   "start_elevation_m": 279.55004050106504,
   "end_elevation_m": 298.2314205152267,
   "min_gradient_pct": 0.11095259993115292
  }
 ],
 "shape": {
  "ascent_concentration": 0.385,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 329.0,
  "shape_class": "sustained"
 },
 "length_m": 1164.995445171357,
 "start_elevation_m": 179.34298314712464,
 "end_elevation_m": 301.0185978744608,
 "endpoint_gain_m": 121.67561472733615,
 "overall_gradient_pct": 10.444299609209127,
 "accumulated_ascent_m": 122.18243028101344,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 20.89404565065479,
   "start_distance_m": 1121.0,
   "end_distance_m": 1126.0,
   "midpoint_distance_m": 1123.5,
   "start_elevation_m": 295.9367210780398,
   "end_elevation_m": 296.98142336057253,
   "start_xy": [
    643164.4144317616,
    4609784.635900154
   ],
   "end_xy": [
    643159.5657121073,
    4609783.441047548
   ]
  },
  "max_10m": {
   "gradient_pct": 20.571842206185806,
   "start_distance_m": 1117.0,
   "end_distance_m": 1127.0,
   "midpoint_distance_m": 1122.0,
   "start_elevation_m": 295.13075985083316,
   "end_elevation_m": 297.18794407145174,
   "start_xy": [
    643168.2628025236,
    4609785.725394463
   ],
   "end_xy": [
    643158.5829328436,
    4609783.2562644025
   ]
  },
  "max_20m": {
   "gradient_pct": 20.171040696737634,
   "start_distance_m": 1107.0,
   "end_distance_m": 1127.0,
   "midpoint_distance_m": 1117.0,
   "start_elevation_m": 293.1537359321042,
   "end_elevation_m": 297.18794407145174,
   "start_xy": [
    643177.924273944,
    4609788.3053109385
   ],
   "end_xy": [
    643158.5829328436,
    4609783.2562644025
   ]
  },
  "max_25m": {
   "gradient_pct": 20.119535507575165,
   "start_distance_m": 1101.0,
   "end_distance_m": 1126.0,
   "midpoint_distance_m": 1113.5,
   "start_elevation_m": 291.95153948367874,
   "end_elevation_m": 296.98142336057253,
   "start_xy": [
    643183.7213487659,
    4609789.852540353
   ],
   "end_xy": [
    643159.5657121073,
    4609783.441047548
   ]
  },
  "max_50m": {
   "gradient_pct": 19.29849472049557,
   "start_distance_m": 1077.0,
   "end_distance_m": 1127.0,
   "midpoint_distance_m": 1102.0,
   "start_elevation_m": 287.53869671120395,
   "end_elevation_m": 297.18794407145174,
   "start_xy": [
    643206.9088614098,
    4609796.04441019
   ],
   "end_xy": [
    643158.5829328436,
    4609783.2562644025
   ]
  },
  "max_100m": {
   "gradient_pct": 18.681380014161675,
   "start_distance_m": 1033.0,
   "end_distance_m": 1133.0,
   "midpoint_distance_m": 1083.0,
   "start_elevation_m": 279.55004050106504,
   "end_elevation_m": 298.2314205152267,
   "start_xy": [
    643249.4552889252,
    4609807.259666125
   ],
   "end_xy": [
    643152.6051424879,
    4609783.412392569
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.175447819930696,
   "start_distance_m": 715.0,
   "end_distance_m": 720.0,
   "midpoint_distance_m": 717.5,
   "start_elevation_m": 247.2874965771257,
   "end_elevation_m": 247.17872418612916,
   "start_xy": [
    643545.6877414482,
    4609852.726414261
   ],
   "end_xy": [
    643542.3720345792,
    4609856.468884065
   ]
  },
  "min_10m": {
   "gradient_pct": -1.9325730044704414,
   "start_distance_m": 715.0,
   "end_distance_m": 725.0,
   "midpoint_distance_m": 720.0,
   "start_elevation_m": 247.2874965771257,
   "end_elevation_m": 247.09423927667865,
   "start_xy": [
    643545.6877414482,
    4609852.726414261
   ],
   "end_xy": [
    643538.9785135015,
    4609860.137879296
   ]
  },
  "min_20m": {
   "gradient_pct": -1.7248620178708052,
   "start_distance_m": 713.0,
   "end_distance_m": 733.0,
   "midpoint_distance_m": 723.0,
   "start_elevation_m": 247.32066436731003,
   "end_elevation_m": 246.97569196373587,
   "start_xy": [
    643547.0137608966,
    4609851.229192834
   ],
   "end_xy": [
    643533.2506125208,
    4609865.7227827655
   ]
  },
  "min_25m": {
   "gradient_pct": -1.5090106578463747,
   "start_distance_m": 712.0,
   "end_distance_m": 737.0,
   "midpoint_distance_m": 724.5,
   "start_elevation_m": 247.3341869173396,
   "end_elevation_m": 246.956934252878,
   "start_xy": [
    643547.6766709841,
    4609850.480493866
   ],
   "end_xy": [
    643530.40093346,
    4609868.529665973
   ]
  },
  "min_50m": {
   "gradient_pct": -0.7358999761366931,
   "start_distance_m": 707.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 732.0,
   "start_elevation_m": 247.32903660809654,
   "end_elevation_m": 246.9610866200282,
   "start_xy": [
    643550.992676559,
    4609846.738287984
   ],
   "end_xy": [
    643512.4256244354,
    4609876.034031646
   ]
  },
  "min_100m": {
   "gradient_pct": 0.11095259993115292,
   "start_distance_m": 676.0,
   "end_distance_m": 776.0,
   "midpoint_distance_m": 726.0,
   "start_elevation_m": 247.15996067433073,
   "end_elevation_m": 247.2709132742619,
   "start_xy": [
    643571.5485475294,
    4609823.533633334
   ],
   "end_xy": [
    643493.5517696654,
    4609878.195180794
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.906197465905564,
   "start_distance_m": 40.0,
   "end_distance_m": 42.0,
   "midpoint_distance_m": 41.0,
   "start_elevation_m": 182.12016273173512,
   "end_elevation_m": 182.55828668105323,
   "start_xy": [
    643994.7250705534,
    4609834.118016458
   ],
   "end_xy": [
    643993.4533757233,
    4609832.574386884
   ]
  },
  "max_3m": {
   "gradient_pct": 22.565251973114187,
   "start_distance_m": 40.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 41.5,
   "start_elevation_m": 182.12016273173512,
   "end_elevation_m": 182.79712029092855,
   "start_xy": [
    643994.7250705534,
    4609834.118016458
   ],
   "end_xy": [
    643992.8175325007,
    4609831.802568647
   ]
  }
 },
 "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": 0.413,
   "obstruction_max_height_m": 32.52,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "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_x64y461_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-03T13:50:00+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/calhoun-hill-road-2/calhoun-hill-road-2.geojson",
  "run_id": "canopy-all-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": [
   "x64y461"
  ],
  "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": 0.96,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Washington",
  "county": "Connecticut"
 }
}