{
 "ocl_version": "0.1.0",
 "name": "Mellon Road",
 "slug": "mellon-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.76157851119723,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2815.0,
   "end_distance_m": 2817.0,
   "start_elevation_m": 244.33523553687374,
   "end_elevation_m": 244.93046710709768,
   "min_gradient_pct": -12.870536005164013
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.35470813839629,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2814.0,
   "end_distance_m": 2817.0,
   "start_elevation_m": 244.0498258629458,
   "end_elevation_m": 244.93046710709768,
   "min_gradient_pct": -12.663371093070927
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.7533261325882,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2814.0,
   "end_distance_m": 2819.0,
   "start_elevation_m": 244.0498258629458,
   "end_elevation_m": 245.4874921695752,
   "min_gradient_pct": -12.263746429815683
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.73121004399121,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2812.0,
   "end_distance_m": 2822.0,
   "start_elevation_m": 243.58931010230737,
   "end_elevation_m": 246.2624311067065,
   "min_gradient_pct": -12.161173176941418
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.24638731133996,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2802.0,
   "end_distance_m": 2822.0,
   "start_elevation_m": 241.4131536444385,
   "end_elevation_m": 246.2624311067065,
   "min_gradient_pct": -11.374516649621143
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.545662164058285,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2800.0,
   "end_distance_m": 2825.0,
   "start_elevation_m": 241.2072554492555,
   "end_elevation_m": 246.59367099027008,
   "min_gradient_pct": -10.904792997844197
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 13.9903204957551,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2779.0,
   "end_distance_m": 2829.0,
   "start_elevation_m": 239.8417882030124,
   "end_elevation_m": 246.83694845088996,
   "min_gradient_pct": -8.61348525589051
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 8.683861003897192,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2729.0,
   "end_distance_m": 2829.0,
   "start_elevation_m": 238.15308744699277,
   "end_elevation_m": 246.83694845088996,
   "min_gradient_pct": -4.053819412708236
  }
 ],
 "shape": {
  "ascent_concentration": 0.428,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 35.0,
  "shape_class": "sustained"
 },
 "length_m": 3313.999999999623,
 "start_elevation_m": 188.6550641456205,
 "end_elevation_m": 259.5374647979694,
 "endpoint_gain_m": 70.88240065234888,
 "overall_gradient_pct": 2.1388775091236254,
 "accumulated_ascent_m": 88.41420125189723,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.7533261325882,
   "start_distance_m": 2814.0,
   "end_distance_m": 2819.0,
   "midpoint_distance_m": 2816.5,
   "start_elevation_m": 244.0498258629458,
   "end_elevation_m": 245.4874921695752,
   "start_xy": [
    729303.1454322306,
    4697145.9210832
   ],
   "end_xy": [
    729305.0682250361,
    4697150.536585178
   ]
  },
  "max_10m": {
   "gradient_pct": 26.73121004399121,
   "start_distance_m": 2812.0,
   "end_distance_m": 2822.0,
   "midpoint_distance_m": 2817.0,
   "start_elevation_m": 243.58931010230737,
   "end_elevation_m": 246.2624311067065,
   "start_xy": [
    729302.3729490797,
    4697144.076291501
   ],
   "end_xy": [
    729306.2173870383,
    4697153.307678353
   ]
  },
  "max_20m": {
   "gradient_pct": 24.24638731133996,
   "start_distance_m": 2802.0,
   "end_distance_m": 2822.0,
   "midpoint_distance_m": 2812.0,
   "start_elevation_m": 241.4131536444385,
   "end_elevation_m": 246.2624311067065,
   "start_xy": [
    729297.9665186105,
    4697135.100259362
   ],
   "end_xy": [
    729306.2173870383,
    4697153.307678353
   ]
  },
  "max_25m": {
   "gradient_pct": 21.545662164058285,
   "start_distance_m": 2800.0,
   "end_distance_m": 2825.0,
   "midpoint_distance_m": 2812.5,
   "start_elevation_m": 241.2072554492555,
   "end_elevation_m": 246.59367099027008,
   "start_xy": [
    729297.0266583881,
    4697133.335695108
   ],
   "end_xy": [
    729307.210321985,
    4697156.138158629
   ]
  },
  "max_50m": {
   "gradient_pct": 13.9903204957551,
   "start_distance_m": 2779.0,
   "end_distance_m": 2829.0,
   "midpoint_distance_m": 2804.0,
   "start_elevation_m": 239.8417882030124,
   "end_elevation_m": 246.83694845088996,
   "start_xy": [
    729285.018045634,
    4697116.1233235635
   ],
   "end_xy": [
    729308.4920050278,
    4697159.92725944
   ]
  },
  "max_100m": {
   "gradient_pct": 8.683861003897192,
   "start_distance_m": 2729.0,
   "end_distance_m": 2829.0,
   "midpoint_distance_m": 2779.0,
   "start_elevation_m": 238.15308744699277,
   "end_elevation_m": 246.83694845088996,
   "start_xy": [
    729251.5092927522,
    4697079.063681668
   ],
   "end_xy": [
    729308.4920050278,
    4697159.92725944
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.263746429815683,
   "start_distance_m": 952.0,
   "end_distance_m": 957.0,
   "midpoint_distance_m": 954.5,
   "start_elevation_m": 222.93384973383775,
   "end_elevation_m": 222.32066241234696,
   "start_xy": [
    728859.5333046898,
    4695449.148771671
   ],
   "end_xy": [
    728864.5288067512,
    4695448.93675006
   ]
  },
  "min_10m": {
   "gradient_pct": -12.161173176941418,
   "start_distance_m": 951.0,
   "end_distance_m": 961.0,
   "midpoint_distance_m": 956.0,
   "start_elevation_m": 223.0563401465266,
   "end_elevation_m": 221.84022282883245,
   "start_xy": [
    728858.5341875121,
    4695449.190781906
   ],
   "end_xy": [
    728868.5251934413,
    4695448.766781657
   ]
  },
  "min_20m": {
   "gradient_pct": -11.374516649621143,
   "start_distance_m": 949.0,
   "end_distance_m": 969.0,
   "midpoint_distance_m": 959.0,
   "start_elevation_m": 223.2275862581527,
   "end_elevation_m": 220.95268292822848,
   "start_xy": [
    728856.6578795144,
    4695448.530890845
   ],
   "end_xy": [
    728876.5180052777,
    4695448.427747779
   ]
  },
  "min_25m": {
   "gradient_pct": -10.904792997844197,
   "start_distance_m": 950.0,
   "end_distance_m": 975.0,
   "midpoint_distance_m": 962.5,
   "start_elevation_m": 223.1532316610483,
   "end_elevation_m": 220.42703341158725,
   "start_xy": [
    728857.5617067025,
    4695448.958650166
   ],
   "end_xy": [
    728882.5126262774,
    4695448.173757828
   ]
  },
  "min_50m": {
   "gradient_pct": -8.61348525589051,
   "start_distance_m": 941.0,
   "end_distance_m": 991.0,
   "midpoint_distance_m": 966.0,
   "start_elevation_m": 223.72008356796226,
   "end_elevation_m": 219.413340940017,
   "start_xy": [
    728849.4574334419,
    4695445.044694423
   ],
   "end_xy": [
    728898.4982112288,
    4695447.494780909
   ]
  },
  "min_100m": {
   "gradient_pct": -4.053819412708236,
   "start_distance_m": 893.0,
   "end_distance_m": 993.0,
   "midpoint_distance_m": 943.0,
   "start_elevation_m": 223.41133240915386,
   "end_elevation_m": 219.35751299644562,
   "start_xy": [
    728809.3704387726,
    4695419.771448816
   ],
   "end_xy": [
    728900.3161307846,
    4695447.562433049
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.76157851119723,
   "start_distance_m": 2815.0,
   "end_distance_m": 2817.0,
   "midpoint_distance_m": 2816.0,
   "start_elevation_m": 244.33523553687374,
   "end_elevation_m": 244.93046710709768,
   "start_xy": [
    729303.5296378105,
    4697146.844330745
   ],
   "end_xy": [
    729304.2994288759,
    4697148.690250733
   ]
  },
  "max_3m": {
   "gradient_pct": 29.35470813839629,
   "start_distance_m": 2814.0,
   "end_distance_m": 2817.0,
   "midpoint_distance_m": 2815.5,
   "start_elevation_m": 244.0498258629458,
   "end_elevation_m": 244.93046710709768,
   "start_xy": [
    729303.1454322306,
    4697145.9210832
   ],
   "end_xy": [
    729304.2994288759,
    4697148.690250733
   ]
  }
 },
 "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": 0.717,
   "obstruction_max_height_m": 32.54,
   "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/ma/USGS_1M_18_x72y470_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-03T22:42:22+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "extent-trim-v2-260903",
  "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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x72y470"
  ],
  "route_cut_m": 3314.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_MA_NE_CMGP_Sandy_Z18_2013",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.997,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Hardwick",
  "county": "Massachusetts"
 }
}