{
 "ocl_version": "0.1.0",
 "name": "Brester Road",
 "slug": "brester-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.58378618447432,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 16.0,
   "end_distance_m": 18.0,
   "start_elevation_m": 226.1924090703177,
   "end_elevation_m": 226.66408479400718,
   "min_gradient_pct": -9.273549076020515
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.545313766210068,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 15.0,
   "end_distance_m": 18.0,
   "start_elevation_m": 225.95772538102088,
   "end_elevation_m": 226.66408479400718,
   "min_gradient_pct": -8.730410938052083
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.38769740239286,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 14.0,
   "end_distance_m": 19.0,
   "start_elevation_m": 225.7222831886114,
   "end_elevation_m": 226.89166805873106,
   "min_gradient_pct": -7.933810761285258
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.849337294743464,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 13.0,
   "end_distance_m": 23.0,
   "start_elevation_m": 225.50871837372688,
   "end_elevation_m": 227.79365210320123,
   "min_gradient_pct": -7.030113822019928
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.47110305588953,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 11.0,
   "end_distance_m": 31.0,
   "start_elevation_m": 225.11216733014825,
   "end_elevation_m": 229.40638794132616,
   "min_gradient_pct": -4.716711112145049
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.90083811626448,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 12.0,
   "end_distance_m": 37.0,
   "start_elevation_m": 225.30356709541124,
   "end_elevation_m": 230.52877662447736,
   "min_gradient_pct": -4.149977017350011
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.81775559697263,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 10.0,
   "end_distance_m": 60.0,
   "start_elevation_m": 224.94371541619356,
   "end_elevation_m": 234.35259321467987,
   "min_gradient_pct": -1.5576222995944704
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.619311634821344,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6.0,
   "end_distance_m": 106.0,
   "start_elevation_m": 224.4509818075937,
   "end_elevation_m": 241.07029344241505,
   "min_gradient_pct": 2.0320058942520234
  }
 ],
 "shape": {
  "ascent_concentration": 0.439,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 108.0,
  "shape_class": "sustained"
 },
 "length_m": 391.0036543678922,
 "start_elevation_m": 224.27874893720556,
 "end_elevation_m": 260.5100717541551,
 "endpoint_gain_m": 36.23132281694953,
 "overall_gradient_pct": 9.266236366901003,
 "accumulated_ascent_m": 37.33903422967401,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.38769740239286,
   "start_distance_m": 14.0,
   "end_distance_m": 19.0,
   "midpoint_distance_m": 16.5,
   "start_elevation_m": 225.7222831886114,
   "end_elevation_m": 226.89166805873106,
   "start_xy": [
    686179.221283027,
    4709704.131925144
   ],
   "end_xy": [
    686174.6899555366,
    4709706.245469838
   ]
  },
  "max_10m": {
   "gradient_pct": 22.849337294743464,
   "start_distance_m": 13.0,
   "end_distance_m": 23.0,
   "midpoint_distance_m": 18.0,
   "start_elevation_m": 225.50871837372688,
   "end_elevation_m": 227.79365210320123,
   "start_xy": [
    686180.127548525,
    4709703.709216205
   ],
   "end_xy": [
    686171.0648935443,
    4709707.936305594
   ]
  },
  "max_20m": {
   "gradient_pct": 21.47110305588953,
   "start_distance_m": 11.0,
   "end_distance_m": 31.0,
   "midpoint_distance_m": 21.0,
   "start_elevation_m": 225.11216733014825,
   "end_elevation_m": 229.40638794132616,
   "start_xy": [
    686181.9400795212,
    4709702.863798328
   ],
   "end_xy": [
    686164.0805887654,
    4709711.747833818
   ]
  },
  "max_25m": {
   "gradient_pct": 20.90083811626448,
   "start_distance_m": 12.0,
   "end_distance_m": 37.0,
   "midpoint_distance_m": 24.5,
   "start_elevation_m": 225.30356709541124,
   "end_elevation_m": 230.52877662447736,
   "start_xy": [
    686181.0338140231,
    4709703.286507267
   ],
   "end_xy": [
    686159.3822521938,
    4709715.479540326
   ]
  },
  "max_50m": {
   "gradient_pct": 18.81775559697263,
   "start_distance_m": 10.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 35.0,
   "start_elevation_m": 224.94371541619356,
   "end_elevation_m": 234.35259321467987,
   "start_xy": [
    686182.8463450193,
    4709702.441089388
   ],
   "end_xy": [
    686143.2263067686,
    4709731.617133233
   ]
  },
  "max_100m": {
   "gradient_pct": 16.619311634821344,
   "start_distance_m": 6.0,
   "end_distance_m": 106.0,
   "midpoint_distance_m": 56.0,
   "start_elevation_m": 224.4509818075937,
   "end_elevation_m": 241.07029344241505,
   "start_xy": [
    686186.4714070115,
    4709700.750253633
   ],
   "end_xy": [
    686151.2380746144,
    4709775.223622185
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.933810761285258,
   "start_distance_m": 248.0,
   "end_distance_m": 253.0,
   "midpoint_distance_m": 250.5,
   "start_elevation_m": 251.48380121316637,
   "end_elevation_m": 251.0871106751021,
   "start_xy": [
    686233.8716133161,
    4709878.222990627
   ],
   "end_xy": [
    686238.8598323076,
    4709878.566023124
   ]
  },
  "min_10m": {
   "gradient_pct": -7.030113822019928,
   "start_distance_m": 244.0,
   "end_distance_m": 254.0,
   "midpoint_distance_m": 249.0,
   "start_elevation_m": 251.74965779067176,
   "end_elevation_m": 251.04664640846977,
   "start_xy": [
    686229.881038123,
    4709877.94856463
   ],
   "end_xy": [
    686239.8574761058,
    4709878.634629624
   ]
  },
  "min_20m": {
   "gradient_pct": -4.716711112145049,
   "start_distance_m": 236.0,
   "end_distance_m": 256.0,
   "midpoint_distance_m": 246.0,
   "start_elevation_m": 251.93577059194865,
   "end_elevation_m": 250.99242836951964,
   "start_xy": [
    686222.7440770172,
    4709874.451070847
   ],
   "end_xy": [
    686241.8527637024,
    4709878.771842622
   ]
  },
  "min_25m": {
   "gradient_pct": -4.149977017350011,
   "start_distance_m": 236.0,
   "end_distance_m": 261.0,
   "midpoint_distance_m": 248.5,
   "start_elevation_m": 251.93577059194865,
   "end_elevation_m": 250.89827633761115,
   "start_xy": [
    686222.7440770172,
    4709874.451070847
   ],
   "end_xy": [
    686246.8409826938,
    4709879.114875119
   ]
  },
  "min_50m": {
   "gradient_pct": -1.5576222995944704,
   "start_distance_m": 230.0,
   "end_distance_m": 280.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 251.8723115023409,
   "end_elevation_m": 251.09350035254366,
   "start_xy": [
    686217.4473078919,
    4709871.632518589
   ],
   "end_xy": [
    686265.7962148612,
    4709880.418398607
   ]
  },
  "min_100m": {
   "gradient_pct": 2.0320058942520234,
   "start_distance_m": 215.0,
   "end_distance_m": 315.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 250.9851805356027,
   "end_elevation_m": 253.01718642985472,
   "start_xy": [
    686204.2053850788,
    4709864.586137943
   ],
   "end_xy": [
    686300.6923502912,
    4709883.112696318
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.58378618447432,
   "start_distance_m": 16.0,
   "end_distance_m": 18.0,
   "midpoint_distance_m": 17.0,
   "start_elevation_m": 226.1924090703177,
   "end_elevation_m": 226.66408479400718,
   "start_xy": [
    686177.4087520308,
    4709704.977343022
   ],
   "end_xy": [
    686175.5962210346,
    4709705.8227609
   ]
  },
  "max_3m": {
   "gradient_pct": 23.545313766210068,
   "start_distance_m": 15.0,
   "end_distance_m": 18.0,
   "midpoint_distance_m": 16.5,
   "start_elevation_m": 225.95772538102088,
   "end_elevation_m": 226.66408479400718,
   "start_xy": [
    686178.315017529,
    4709704.554634083
   ],
   "end_xy": [
    686175.5962210346,
    4709705.8227609
   ]
  }
 },
 "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": 0.723,
   "obstruction_max_height_m": 30.37,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "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_x68y471_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:43:18+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": "hunt-wave1-260905",
  "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": [
   "x68y471"
  ],
  "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_ME_MA_QL1_UTM18_L1_2015_LAS_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.html"
 },
 "area": {
  "place": "Conway",
  "county": "Massachusetts"
 }
}