{
 "ocl_version": "0.1.0",
 "name": "Fribolin Road",
 "slug": "fribolin-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.273262390948844,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 430.0,
   "end_distance_m": 432.0,
   "start_elevation_m": 444.1593413422061,
   "end_elevation_m": 444.5848065900251,
   "min_gradient_pct": -3.3149129573246228
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 20.97712312464637,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 425.0,
   "end_distance_m": 428.0,
   "start_elevation_m": 443.15060215301594,
   "end_elevation_m": 443.77991584675533,
   "min_gradient_pct": -2.9809341774371965
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 20.728236224312013,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 423.0,
   "end_distance_m": 428.0,
   "start_elevation_m": 442.74350403553973,
   "end_elevation_m": 443.77991584675533,
   "min_gradient_pct": -2.390852179925105
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.63379330053749,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 418.0,
   "end_distance_m": 428.0,
   "start_elevation_m": 441.7165365167016,
   "end_elevation_m": 443.77991584675533,
   "min_gradient_pct": -1.7164651151927046
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.44867131936286,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 413.0,
   "end_distance_m": 433.0,
   "start_elevation_m": 440.6909196286177,
   "end_elevation_m": 444.78065389249025,
   "min_gradient_pct": -0.14512615828778053
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.378676473719224,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 407.0,
   "end_distance_m": 432.0,
   "start_elevation_m": 439.4901374715953,
   "end_elevation_m": 444.5848065900251,
   "min_gradient_pct": 0.7705782757675479
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.146651860321867,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 402.0,
   "end_distance_m": 452.0,
   "start_elevation_m": 438.48604609253834,
   "end_elevation_m": 448.5593720226993,
   "min_gradient_pct": 4.856267216130959
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.309407767759524,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 390.0,
   "end_distance_m": 490.0,
   "start_elevation_m": 436.25724707402344,
   "end_elevation_m": 455.56665484178296,
   "min_gradient_pct": 5.188264251662758
  }
 ],
 "shape": {
  "ascent_concentration": 0.343,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 636.0,
  "shape_class": "sustained"
 },
 "length_m": 843.711550550899,
 "start_elevation_m": 386.6091235253857,
 "end_elevation_m": 494.50037168349724,
 "endpoint_gain_m": 107.89124815811152,
 "overall_gradient_pct": 12.787693624398557,
 "accumulated_ascent_m": 108.295037050193,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 20.728236224312013,
   "start_distance_m": 423.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 425.5,
   "start_elevation_m": 442.74350403553973,
   "end_elevation_m": 443.77991584675533,
   "start_xy": [
    304984.0787461797,
    4728619.724228188
   ],
   "end_xy": [
    304979.54632498085,
    4728621.835426444
   ]
  },
  "max_10m": {
   "gradient_pct": 20.63379330053749,
   "start_distance_m": 418.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 423.0,
   "start_elevation_m": 441.7165365167016,
   "end_elevation_m": 443.77991584675533,
   "start_xy": [
    304988.61116737855,
    4728617.613029933
   ],
   "end_xy": [
    304979.54632498085,
    4728621.835426444
   ]
  },
  "max_20m": {
   "gradient_pct": 20.44867131936286,
   "start_distance_m": 413.0,
   "end_distance_m": 433.0,
   "midpoint_distance_m": 423.0,
   "start_elevation_m": 440.6909196286177,
   "end_elevation_m": 444.78065389249025,
   "start_xy": [
    304993.1435885774,
    4728615.501831677
   ],
   "end_xy": [
    304975.01390378195,
    4728623.9466247
   ]
  },
  "max_25m": {
   "gradient_pct": 20.378676473719224,
   "start_distance_m": 407.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 419.5,
   "start_elevation_m": 439.4901374715953,
   "end_elevation_m": 444.5848065900251,
   "start_xy": [
    304998.58249401604,
    4728612.968393769
   ],
   "end_xy": [
    304975.92038802174,
    4728623.524385049
   ]
  },
  "max_50m": {
   "gradient_pct": 20.146651860321867,
   "start_distance_m": 402.0,
   "end_distance_m": 452.0,
   "midpoint_distance_m": 427.0,
   "start_elevation_m": 438.48604609253834,
   "end_elevation_m": 448.5593720226993,
   "start_xy": [
    305003.11491521494,
    4728610.857195513
   ],
   "end_xy": [
    304957.7907032263,
    4728631.969178073
   ]
  },
  "max_100m": {
   "gradient_pct": 19.309407767759524,
   "start_distance_m": 390.0,
   "end_distance_m": 490.0,
   "midpoint_distance_m": 440.0,
   "start_elevation_m": 436.25724707402344,
   "end_elevation_m": 455.56665484178296,
   "start_xy": [
    305013.99272609217,
    4728605.790319699
   ],
   "end_xy": [
    304924.2044310951,
    4728649.591825504
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.390852179925105,
   "start_distance_m": 4.0,
   "end_distance_m": 9.0,
   "midpoint_distance_m": 6.5,
   "start_elevation_m": 386.5872422601866,
   "end_elevation_m": 386.46769965119034,
   "start_xy": [
    305372.81545672857,
    4728514.881381472
   ],
   "end_xy": [
    305367.98227763927,
    4728513.60060831
   ]
  },
  "min_10m": {
   "gradient_pct": -1.7164651151927046,
   "start_distance_m": 1.0,
   "end_distance_m": 11.0,
   "midpoint_distance_m": 6.0,
   "start_elevation_m": 386.6226167929657,
   "end_elevation_m": 386.4509702814464,
   "start_xy": [
    305375.71536418214,
    4728515.649845368
   ],
   "end_xy": [
    305366.0490060036,
    4728513.088299045
   ]
  },
  "min_20m": {
   "gradient_pct": -0.14512615828778053,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 386.6091235253857,
   "end_elevation_m": 386.58009829372816,
   "start_xy": [
    305376.682,
    4728515.906
   ],
   "end_xy": [
    305357.3492836429,
    4728510.782907355
   ]
  },
  "min_25m": {
   "gradient_pct": 0.7705782757675479,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 386.6091235253857,
   "end_elevation_m": 386.8017680943276,
   "start_xy": [
    305376.682,
    4728515.906
   ],
   "end_xy": [
    305352.51610455365,
    4728509.502134194
   ]
  },
  "min_50m": {
   "gradient_pct": 4.856267216130959,
   "start_distance_m": 751.0,
   "end_distance_m": 801.0,
   "midpoint_distance_m": 776.0,
   "start_elevation_m": 490.11119355967315,
   "end_elevation_m": 492.53932716773863,
   "start_xy": [
    304703.4087241111,
    4728788.768889023
   ],
   "end_xy": [
    304666.15739902837,
    4728760.789740798
   ]
  },
  "min_100m": {
   "gradient_pct": 5.188264251662758,
   "start_distance_m": 743.0,
   "end_distance_m": 843.0,
   "midpoint_distance_m": 793.0,
   "start_elevation_m": 489.3118050847712,
   "end_elevation_m": 494.50006933643397,
   "start_xy": [
    304710.1768532302,
    4728784.50363074
   ],
   "end_xy": [
    304628.8785919999,
    4728742.077674871
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.273262390948844,
   "start_distance_m": 430.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 431.0,
   "start_elevation_m": 444.1593413422061,
   "end_elevation_m": 444.5848065900251,
   "start_xy": [
    304977.73335650127,
    4728622.679905747
   ],
   "end_xy": [
    304975.92038802174,
    4728623.524385049
   ]
  },
  "max_3m": {
   "gradient_pct": 20.97712312464637,
   "start_distance_m": 425.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 426.5,
   "start_elevation_m": 443.15060215301594,
   "end_elevation_m": 443.77991584675533,
   "start_xy": [
    304982.2657777002,
    4728620.56870749
   ],
   "end_xy": [
    304979.54632498085,
    4728621.835426444
   ]
  }
 },
 "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": 0.151,
   "obstruction_max_height_m": 19.93,
   "flagged_windows_m": []
  },
  "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/ny/USGS_1M_18_x30y473_NY_FEMAR2_Central_2018_D19.tif"
  ],
  "calculated_at": "2026-09-06T13:00:59+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-band1.osm.pbf",
  "osm_snapshot": "",
  "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": [
   "x30y473"
  ],
  "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_3_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": "South Bristol",
  "county": "New York"
 }
}