{
 "ocl_version": "0.1.0",
 "name": "Van Neel Trail",
 "slug": "van-neel-trail-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.61662776121989,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 144.0,
   "end_distance_m": 146.0,
   "start_elevation_m": 502.321145948688,
   "end_elevation_m": 502.7934785039124,
   "min_gradient_pct": -0.7176819382038957
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.35793899809649,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 144.0,
   "end_distance_m": 147.0,
   "start_elevation_m": 502.321145948688,
   "end_elevation_m": 503.0218841186309,
   "min_gradient_pct": -0.5557836748531978
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.78805864692231,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 143.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 502.10342458385935,
   "end_elevation_m": 503.24282751620547,
   "min_gradient_pct": -0.3802585361677302
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.938057654198246,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 138.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 501.04902175078564,
   "end_elevation_m": 503.24282751620547,
   "min_gradient_pct": 0.03058442763858693
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.119032837211762,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 129.0,
   "end_distance_m": 149.0,
   "start_elevation_m": 499.2191893003301,
   "end_elevation_m": 503.4429958677724,
   "min_gradient_pct": 0.48456868592438695
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.004914005369073,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 92.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 491.6665257729536,
   "end_elevation_m": 496.9177542742959,
   "min_gradient_pct": 0.6164557761198921
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.675208846688406,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 100.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 493.3044972029973,
   "end_elevation_m": 503.6421016263415,
   "min_gradient_pct": 1.54647926983057
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.264997109763783,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 79.0,
   "end_distance_m": 179.0,
   "start_elevation_m": 489.00724282421027,
   "end_elevation_m": 509.27223993397405,
   "min_gradient_pct": 3.2648438013902705
  }
 ],
 "shape": {
  "ascent_concentration": 0.419,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 254.0,
  "shape_class": "sustained"
 },
 "length_m": 478.9999999999827,
 "start_elevation_m": 476.3923478138292,
 "end_elevation_m": 533.7222206793673,
 "endpoint_gain_m": 57.32987286553811,
 "overall_gradient_pct": 11.96865821827561,
 "accumulated_ascent_m": 57.34888579234649,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.78805864692231,
   "start_distance_m": 143.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 145.5,
   "start_elevation_m": 502.10342458385935,
   "end_elevation_m": 503.24282751620547,
   "start_xy": [
    313801.9883779365,
    4708938.4161349675
   ],
   "end_xy": [
    313805.289248173,
    4708942.171698266
   ]
  },
  "max_10m": {
   "gradient_pct": 21.938057654198246,
   "start_distance_m": 138.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 143.0,
   "start_elevation_m": 501.04902175078564,
   "end_elevation_m": 503.24282751620547,
   "start_xy": [
    313798.68750769994,
    4708934.66057167
   ],
   "end_xy": [
    313805.289248173,
    4708942.171698266
   ]
  },
  "max_20m": {
   "gradient_pct": 21.119032837211762,
   "start_distance_m": 129.0,
   "end_distance_m": 149.0,
   "midpoint_distance_m": 139.0,
   "start_elevation_m": 499.2191893003301,
   "end_elevation_m": 503.4429958677724,
   "start_xy": [
    313792.7459412741,
    4708927.900557735
   ],
   "end_xy": [
    313805.94942222035,
    4708942.922810925
   ]
  },
  "max_25m": {
   "gradient_pct": 21.004914005369073,
   "start_distance_m": 92.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 104.5,
   "start_elevation_m": 491.6665257729536,
   "end_elevation_m": 496.9177542742959,
   "start_xy": [
    313767.9095933215,
    4708900.53920397
   ],
   "end_xy": [
    313784.8238527064,
    4708918.8872058205
   ]
  },
  "max_50m": {
   "gradient_pct": 20.675208846688406,
   "start_distance_m": 100.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 125.0,
   "start_elevation_m": 493.3044972029973,
   "end_elevation_m": 503.6421016263415,
   "start_xy": [
    313773.6008939021,
    4708906.11829061
   ],
   "end_xy": [
    313806.60959626763,
    4708943.673923585
   ]
  },
  "max_100m": {
   "gradient_pct": 20.264997109763783,
   "start_distance_m": 79.0,
   "end_distance_m": 179.0,
   "midpoint_distance_m": 129.0,
   "start_elevation_m": 489.00724282421027,
   "end_elevation_m": 509.27223993397405,
   "start_xy": [
    313757.58828942274,
    4708892.683799211
   ],
   "end_xy": [
    313825.75464363967,
    4708965.45619071
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.3802585361677302,
   "start_distance_m": 432.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 434.5,
   "start_elevation_m": 532.6660646254687,
   "end_elevation_m": 532.6470516986603,
   "start_xy": [
    313916.11166874436,
    4709173.054978751
   ],
   "end_xy": [
    313917.58825699426,
    4709177.831974369
   ]
  },
  "min_10m": {
   "gradient_pct": 0.03058442763858693,
   "start_distance_m": 427.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 432.0,
   "start_elevation_m": 532.6439932558965,
   "end_elevation_m": 532.6470516986603,
   "start_xy": [
    313914.6350804944,
    4709168.277983132
   ],
   "end_xy": [
    313917.58825699426,
    4709177.831974369
   ]
  },
  "min_20m": {
   "gradient_pct": 0.48456868592438695,
   "start_distance_m": 421.0,
   "end_distance_m": 441.0,
   "midpoint_distance_m": 431.0,
   "start_elevation_m": 532.5905487214638,
   "end_elevation_m": 532.6874624586487,
   "start_xy": [
    313912.8631745945,
    4709162.545588389
   ],
   "end_xy": [
    313918.4176226854,
    4709181.727028206
   ]
  },
  "min_25m": {
   "gradient_pct": 0.6164557761198921,
   "start_distance_m": 422.0,
   "end_distance_m": 447.0,
   "midpoint_distance_m": 434.5,
   "start_elevation_m": 532.5959411939624,
   "end_elevation_m": 532.7500551379924,
   "start_xy": [
    313913.1584922445,
    4709163.500987513
   ],
   "end_xy": [
    313919.08160392643,
    4709187.690016189
   ]
  },
  "min_50m": {
   "gradient_pct": 1.54647926983057,
   "start_distance_m": 408.0,
   "end_distance_m": 458.0,
   "midpoint_distance_m": 433.0,
   "start_elevation_m": 532.2145218630483,
   "end_elevation_m": 532.9877614979636,
   "start_xy": [
    313910.68705139484,
    4709149.787715356
   ],
   "end_xy": [
    313917.0003277122,
    4709198.224398069
   ]
  },
  "min_100m": {
   "gradient_pct": 3.2648438013902705,
   "start_distance_m": 379.0,
   "end_distance_m": 479.0,
   "midpoint_distance_m": 429.0,
   "start_elevation_m": 530.457376877977,
   "end_elevation_m": 533.7222206793673,
   "start_xy": [
    313918.41223695164,
    4709122.117438174
   ],
   "end_xy": [
    313899.6971818596,
    4709207.792730727
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.61662776121989,
   "start_distance_m": 144.0,
   "end_distance_m": 146.0,
   "midpoint_distance_m": 145.0,
   "start_elevation_m": 502.321145948688,
   "end_elevation_m": 502.7934785039124,
   "start_xy": [
    313802.64855198376,
    4708939.167247628
   ],
   "end_xy": [
    313803.9689000784,
    4708940.669472947
   ]
  },
  "max_3m": {
   "gradient_pct": 23.35793899809649,
   "start_distance_m": 144.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 145.5,
   "start_elevation_m": 502.321145948688,
   "end_elevation_m": 503.0218841186309,
   "start_xy": [
    313802.64855198376,
    4708939.167247628
   ],
   "end_xy": [
    313804.6290741257,
    4708941.420585606
   ]
  }
 },
 "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": 0.808,
   "obstruction_max_height_m": 22.57,
   "flagged_windows_m": [
    2,
    3,
    5,
    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/ny/USGS_1M_18_x31y471_NY_FEMAR2_Central_2018_D19.tif"
  ],
  "calculated_at": "2026-09-06T17:16:52+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-york-2026-09-06-batch.osm.pbf",
  "osm_snapshot": "2026-09-04T20:21:21Z",
  "run_id": "ny-run3-260906",
  "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, NY_FEMAR2_Central_2018_D19 (collected 2018)",
  "elevation_tile_ids": [
   "x31y471"
  ],
  "route_summit_trim_m": 228.7,
  "route_summit_trim_loss_m": 12.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NY_FEMAR2_Central_5_2018",
   "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"
 },
 "area": {
  "place": "Prattsburgh",
  "county": "New York"
 }
}