{
 "ocl_version": "0.1.0",
 "name": "Terrace Drive",
 "slug": "terrace-drive",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.09745178364966,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 97.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 164.78797503913245,
   "end_elevation_m": 165.28992407480544,
   "min_gradient_pct": -13.565586520910244
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.43026714545245,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 97.0,
   "end_distance_m": 100.0,
   "start_elevation_m": 164.78797503913245,
   "end_elevation_m": 165.52088305349602,
   "min_gradient_pct": -13.265623363441629
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.81919977210714,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 164.09896408620008,
   "end_elevation_m": 165.28992407480544,
   "min_gradient_pct": -12.949483186698103
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.30752774529259,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 91.0,
   "end_distance_m": 101.0,
   "start_elevation_m": 163.42765984998647,
   "end_elevation_m": 165.75841262451573,
   "min_gradient_pct": -12.493163157140259
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.2042610247847,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 87.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 162.59860448197708,
   "end_elevation_m": 167.03945668693402,
   "min_gradient_pct": -12.396162419934882
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.734404853974524,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 86.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 162.39610368651512,
   "end_elevation_m": 167.82970490000875,
   "min_gradient_pct": -12.437056517231667
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.53612582258279,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 79.0,
   "end_distance_m": 129.0,
   "start_elevation_m": 161.1699482926282,
   "end_elevation_m": 170.9380112039196,
   "min_gradient_pct": -11.736571727389276
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.79918767230768,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 162.0,
   "end_distance_m": 262.0,
   "start_elevation_m": 175.9187409435503,
   "end_elevation_m": 193.71792861585797,
   "min_gradient_pct": -9.834253798894991
  }
 ],
 "shape": {
  "ascent_concentration": 0.519,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 205.0,
  "shape_class": "stepped"
 },
 "length_m": 624.7261418966187,
 "start_elevation_m": 154.17103763814097,
 "end_elevation_m": 196.63342197170059,
 "endpoint_gain_m": 42.46238433355961,
 "overall_gradient_pct": 6.796959737373435,
 "accumulated_ascent_m": 53.39037571196769,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.81919977210714,
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 164.09896408620008,
   "end_elevation_m": 165.28992407480544,
   "start_xy": [
    628173.6604433756,
    4600857.430372388
   ],
   "end_xy": [
    628173.2274247155,
    4600862.4115860155
   ]
  },
  "max_10m": {
   "gradient_pct": 23.30752774529259,
   "start_distance_m": 91.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 96.0,
   "start_elevation_m": 163.42765984998647,
   "end_elevation_m": 165.75841262451573,
   "start_xy": [
    628173.9204183832,
    4600854.44165851
   ],
   "end_xy": [
    628172.9834782734,
    4600864.395411793
   ]
  },
  "max_20m": {
   "gradient_pct": 22.2042610247847,
   "start_distance_m": 87.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 97.0,
   "start_elevation_m": 162.59860448197708,
   "end_elevation_m": 167.03945668693402,
   "start_xy": [
    628174.2664256139,
    4600850.456652192
   ],
   "end_xy": [
    628171.7783317493,
    4600870.273133759
   ]
  },
  "max_25m": {
   "gradient_pct": 21.734404853974524,
   "start_distance_m": 86.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 98.5,
   "start_elevation_m": 162.39610368651512,
   "end_elevation_m": 167.82970490000875,
   "start_xy": [
    628174.3534370435,
    4600849.4604448825
   ],
   "end_xy": [
    628170.9150244612,
    4600874.177296819
   ]
  },
  "max_50m": {
   "gradient_pct": 19.53612582258279,
   "start_distance_m": 79.0,
   "end_distance_m": 129.0,
   "midpoint_distance_m": 104.0,
   "start_elevation_m": 161.1699482926282,
   "end_elevation_m": 170.9380112039196,
   "start_xy": [
    628174.9604057162,
    4600842.486810355
   ],
   "end_xy": [
    628163.8660421876,
    4600890.729060781
   ]
  },
  "max_100m": {
   "gradient_pct": 17.79918767230768,
   "start_distance_m": 162.0,
   "end_distance_m": 262.0,
   "midpoint_distance_m": 212.0,
   "start_elevation_m": 175.9187409435503,
   "end_elevation_m": 193.71792861585797,
   "start_xy": [
    628155.3833546337,
    4600922.565117139
   ],
   "end_xy": [
    628139.1867522232,
    4601020.410649742
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.949483186698103,
   "start_distance_m": 455.0,
   "end_distance_m": 460.0,
   "midpoint_distance_m": 457.5,
   "start_elevation_m": 190.449249789646,
   "end_elevation_m": 189.80177563031108,
   "start_xy": [
    628078.8847236307,
    4601199.945542817
   ],
   "end_xy": [
    628080.2046345115,
    4601204.768180565
   ]
  },
  "min_10m": {
   "gradient_pct": -12.493163157140259,
   "start_distance_m": 454.0,
   "end_distance_m": 464.0,
   "midpoint_distance_m": 459.0,
   "start_elevation_m": 190.57208262423356,
   "end_elevation_m": 189.32276630851953,
   "start_xy": [
    628078.6205998574,
    4601198.981054025
   ],
   "end_xy": [
    628081.2615877924,
    4601208.626009969
   ]
  },
  "min_20m": {
   "gradient_pct": -12.396162419934882,
   "start_distance_m": 454.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 464.0,
   "start_elevation_m": 190.57208262423356,
   "end_elevation_m": 188.09285014024658,
   "start_xy": [
    628078.6205998574,
    4601198.981054025
   ],
   "end_xy": [
    628086.3459885595,
    4601217.171458526
   ]
  },
  "min_25m": {
   "gradient_pct": -12.437056517231667,
   "start_distance_m": 445.0,
   "end_distance_m": 470.0,
   "midpoint_distance_m": 457.5,
   "start_elevation_m": 191.6746107556943,
   "end_elevation_m": 188.56534662638637,
   "start_xy": [
    628077.2029396405,
    4601190.123532021
   ],
   "end_xy": [
    628084.129924203,
    4601213.841434904
   ]
  },
  "min_50m": {
   "gradient_pct": -11.736571727389276,
   "start_distance_m": 427.0,
   "end_distance_m": 477.0,
   "midpoint_distance_m": 452.0,
   "start_elevation_m": 193.65747145159312,
   "end_elevation_m": 187.7891855878985,
   "start_xy": [
    628076.5308878133,
    4601172.2018694915
   ],
   "end_xy": [
    628088.0088788314,
    4601219.668415282
   ]
  },
  "min_100m": {
   "gradient_pct": -9.834253798894991,
   "start_distance_m": 394.0,
   "end_distance_m": 494.0,
   "midpoint_distance_m": 444.0,
   "start_elevation_m": 196.6345031118158,
   "end_elevation_m": 186.8002493129208,
   "start_xy": [
    628084.5427177354,
    4601140.50821397
   ],
   "end_xy": [
    628096.8219743412,
    4601234.188621364
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.09745178364966,
   "start_distance_m": 97.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 98.0,
   "start_elevation_m": 164.78797503913245,
   "end_elevation_m": 165.28992407480544,
   "start_xy": [
    628173.4004683606,
    4600860.419086354
   ],
   "end_xy": [
    628173.2274247155,
    4600862.4115860155
   ]
  },
  "max_3m": {
   "gradient_pct": 24.43026714545245,
   "start_distance_m": 97.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 98.5,
   "start_elevation_m": 164.78797503913245,
   "end_elevation_m": 165.52088305349602,
   "start_xy": [
    628173.4004683606,
    4600860.419086354
   ],
   "end_xy": [
    628173.1399355,
    4600863.407735009
   ]
  }
 },
 "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": 0.591,
   "obstruction_max_height_m": 34.07,
   "flagged_windows_m": [
    3,
    10,
    20,
    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_x62y461_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-03T21:27:07+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/terrace-drive/terrace-drive.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": [
   "x62y461"
  ],
  "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": "Sherman",
  "county": "Connecticut"
 }
}