{
 "ocl_version": "0.1.0",
 "name": "Hammond Road",
 "slug": "hammond-road-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.90721857372671,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 773.0,
   "end_distance_m": 775.0,
   "start_elevation_m": 389.12435384756924,
   "end_elevation_m": 389.6424982190438,
   "min_gradient_pct": -22.086288959408762
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.65357080101474,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 773.0,
   "end_distance_m": 776.0,
   "start_elevation_m": 389.12435384756924,
   "end_elevation_m": 389.8639609715997,
   "min_gradient_pct": -21.671275069904066
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.165025660534866,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 772.0,
   "end_distance_m": 777.0,
   "start_elevation_m": 388.9093982252388,
   "end_elevation_m": 390.06764950826556,
   "min_gradient_pct": -18.980323699519204
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.38839345320514,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 772.0,
   "end_distance_m": 782.0,
   "start_elevation_m": 388.9093982252388,
   "end_elevation_m": 391.14823757055933,
   "min_gradient_pct": -12.695413275746432
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.862677435843295,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 768.0,
   "end_distance_m": 788.0,
   "start_elevation_m": 388.1989477283142,
   "end_elevation_m": 392.37148321548284,
   "min_gradient_pct": -8.253724268789995
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.443407084320143,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 762.0,
   "end_distance_m": 787.0,
   "start_elevation_m": 387.0976633905136,
   "end_elevation_m": 392.20851516159365,
   "min_gradient_pct": -6.803674555933867
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.055036237492686,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 738.0,
   "end_distance_m": 788.0,
   "start_elevation_m": 383.3439650967365,
   "end_elevation_m": 392.37148321548284,
   "min_gradient_pct": -3.418807576502445
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.67421368694778,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 700.0,
   "end_distance_m": 800.0,
   "start_elevation_m": 378.98379568346775,
   "end_elevation_m": 393.6580093704155,
   "min_gradient_pct": 1.363016708062446
  }
 ],
 "shape": {
  "ascent_concentration": 0.305,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 136.0,
  "shape_class": "sustained"
 },
 "length_m": 910.1000000001404,
 "start_elevation_m": 316.949609565734,
 "end_elevation_m": 401.6553479654083,
 "endpoint_gain_m": 84.70573839967426,
 "overall_gradient_pct": 9.30730012082861,
 "accumulated_ascent_m": 87.12481730458865,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.165025660534866,
   "start_distance_m": 772.0,
   "end_distance_m": 777.0,
   "midpoint_distance_m": 774.5,
   "start_elevation_m": 388.9093982252388,
   "end_elevation_m": 390.06764950826556,
   "start_xy": [
    360394.53331147425,
    4663067.215762666
   ],
   "end_xy": [
    360395.06837375544,
    4663072.187051046
   ]
  },
  "max_10m": {
   "gradient_pct": 22.38839345320514,
   "start_distance_m": 772.0,
   "end_distance_m": 782.0,
   "midpoint_distance_m": 777.0,
   "start_elevation_m": 388.9093982252388,
   "end_elevation_m": 391.14823757055933,
   "start_xy": [
    360394.53331147425,
    4663067.215762666
   ],
   "end_xy": [
    360395.60435942997,
    4663077.158239559
   ]
  },
  "max_20m": {
   "gradient_pct": 20.862677435843295,
   "start_distance_m": 768.0,
   "end_distance_m": 788.0,
   "midpoint_distance_m": 778.0,
   "start_elevation_m": 388.1989477283142,
   "end_elevation_m": 392.37148321548284,
   "start_xy": [
    360394.10530763504,
    4663063.2387270015
   ],
   "end_xy": [
    360396.2463459475,
    4663083.12379511
   ]
  },
  "max_25m": {
   "gradient_pct": 20.443407084320143,
   "start_distance_m": 762.0,
   "end_distance_m": 787.0,
   "midpoint_distance_m": 774.5,
   "start_elevation_m": 387.0976633905136,
   "end_elevation_m": 392.20851516159365,
   "start_xy": [
    360393.46236324596,
    4663057.273275044
   ],
   "end_xy": [
    360396.13928775984,
    4663082.1295423675
   ]
  },
  "max_50m": {
   "gradient_pct": 18.055036237492686,
   "start_distance_m": 738.0,
   "end_distance_m": 788.0,
   "midpoint_distance_m": 763.0,
   "start_elevation_m": 383.3439650967365,
   "end_elevation_m": 392.37148321548284,
   "start_xy": [
    360390.89236321516,
    4663033.411274757
   ],
   "end_xy": [
    360396.2463459475,
    4663083.12379511
   ]
  },
  "max_100m": {
   "gradient_pct": 14.67421368694778,
   "start_distance_m": 700.0,
   "end_distance_m": 800.0,
   "midpoint_distance_m": 750.0,
   "start_elevation_m": 378.98379568346775,
   "end_elevation_m": 393.6580093704155,
   "start_xy": [
    360386.82331140444,
    4662995.629762019
   ],
   "end_xy": [
    360397.5313459573,
    4663095.0547952
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.980323699519204,
   "start_distance_m": 584.0,
   "end_distance_m": 589.0,
   "midpoint_distance_m": 586.5,
   "start_elevation_m": 374.09413419739246,
   "end_elevation_m": 373.1451180124165,
   "start_xy": [
    360365.99913756724,
    4662881.76983559
   ],
   "end_xy": [
    360366.9371478182,
    4662886.681060457
   ]
  },
  "min_10m": {
   "gradient_pct": -12.695413275746432,
   "start_distance_m": 582.0,
   "end_distance_m": 592.0,
   "midpoint_distance_m": 587.0,
   "start_elevation_m": 374.23904530248143,
   "end_elevation_m": 372.9695039749068,
   "start_xy": [
    360365.332666179,
    4662879.88531182
   ],
   "end_xy": [
    360367.499158923,
    4662889.6279471405
   ]
  },
  "min_20m": {
   "gradient_pct": -8.253724268789995,
   "start_distance_m": 576.0,
   "end_distance_m": 596.0,
   "midpoint_distance_m": 586.0,
   "start_elevation_m": 374.5647628033981,
   "end_elevation_m": 372.9140179496401,
   "start_xy": [
    360363.1627105947,
    4662874.291450235
   ],
   "end_xy": [
    360368.2491696008,
    4662893.557002915
   ]
  },
  "min_25m": {
   "gradient_pct": -6.803674555933867,
   "start_distance_m": 576.0,
   "end_distance_m": 601.0,
   "midpoint_distance_m": 588.5,
   "start_elevation_m": 374.5647628033981,
   "end_elevation_m": 372.8638441644146,
   "start_xy": [
    360363.1627105947,
    4662874.291450235
   ],
   "end_xy": [
    360369.18700101355,
    4662898.4682620065
   ]
  },
  "min_50m": {
   "gradient_pct": -3.418807576502445,
   "start_distance_m": 572.0,
   "end_distance_m": 622.0,
   "midpoint_distance_m": 597.0,
   "start_elevation_m": 374.54672689721184,
   "end_elevation_m": 372.8373231089606,
   "start_xy": [
    360361.7156848781,
    4662870.562359963
   ],
   "end_xy": [
    360373.207627626,
    4662919.076340003
   ]
  },
  "min_100m": {
   "gradient_pct": 1.363016708062446,
   "start_distance_m": 568.0,
   "end_distance_m": 668.0,
   "midpoint_distance_m": 618.0,
   "start_elevation_m": 374.2489805072532,
   "end_elevation_m": 375.6119972153156,
   "start_xy": [
    360360.26949964784,
    4662866.832943689
   ],
   "end_xy": [
    360383.1485739563,
    4662963.841594297
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.90721857372671,
   "start_distance_m": 773.0,
   "end_distance_m": 775.0,
   "midpoint_distance_m": 774.0,
   "start_elevation_m": 389.12435384756924,
   "end_elevation_m": 389.6424982190438,
   "start_xy": [
    360394.64033903735,
    4663068.2100187205
   ],
   "end_xy": [
    360394.85428775026,
    4663070.198542277
   ]
  },
  "max_3m": {
   "gradient_pct": 24.65357080101474,
   "start_distance_m": 773.0,
   "end_distance_m": 776.0,
   "midpoint_distance_m": 774.5,
   "start_elevation_m": 389.12435384756924,
   "end_elevation_m": 389.8639609715997,
   "start_xy": [
    360394.64033903735,
    4663068.2100187205
   ],
   "end_xy": [
    360394.96131531335,
    4663071.192798331
   ]
  }
 },
 "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": 0.365,
   "obstruction_max_height_m": 21.02,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "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_x36y467_NY_FEMAR2_Central_2018_D19.tif"
  ],
  "calculated_at": "2026-09-08T17:55:47+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": "retro-box-260908",
  "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": [
   "x36y467"
  ],
  "route_cut_m": 910.1,
  "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": "Baldwin",
  "county": "New York"
 }
}