{
 "ocl_version": "0.1.0",
 "name": "Pepper Ridge Road",
 "slug": "pepper-ridge-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.70086025126787,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 58.0,
   "end_distance_m": 60.0,
   "start_elevation_m": 83.45413870950433,
   "end_elevation_m": 84.30815591452969,
   "min_gradient_pct": -29.488028509882724,
   "suppressed_max_gradient_pct": 73.92609670882777,
   "suppressed_location_m": [
    263.0,
    265.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.87556597734524,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 194.0,
   "end_distance_m": 197.0,
   "start_elevation_m": 97.65747572375719,
   "end_elevation_m": 98.88374270307754,
   "min_gradient_pct": -27.55740688602515,
   "suppressed_max_gradient_pct": 60.460622936945185,
   "suppressed_location_m": [
    263.0,
    266.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.507468448952864,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 193.0,
   "end_distance_m": 198.0,
   "start_elevation_m": 97.36092258254584,
   "end_elevation_m": 99.13629600499348,
   "min_gradient_pct": -21.742883763778877,
   "suppressed_max_gradient_pct": 45.62982159930954,
   "suppressed_location_m": [
    263.0,
    268.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.928313089923222,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 188.0,
   "end_distance_m": 198.0,
   "start_elevation_m": 96.14346469600116,
   "end_elevation_m": 99.13629600499348,
   "min_gradient_pct": -17.852354970922732,
   "suppressed_max_gradient_pct": 35.339637486828934,
   "suppressed_location_m": [
    263.0,
    273.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.70112321812303,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 182.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 94.96731062860539,
   "end_elevation_m": 100.10753527223,
   "min_gradient_pct": -10.719323158075653,
   "suppressed_max_gradient_pct": 27.001509047090764,
   "suppressed_location_m": [
    148.0,
    168.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.727779816178327,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 183.0,
   "end_distance_m": 208.0,
   "start_elevation_m": 95.10412129934736,
   "end_elevation_m": 100.78606625339194,
   "min_gradient_pct": -8.497095597030977,
   "suppressed_max_gradient_pct": 24.309834322205862,
   "suppressed_location_m": [
    148.0,
    173.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.681408562659954,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 457.0,
   "end_distance_m": 507.0,
   "start_elevation_m": 125.24601260491787,
   "end_elevation_m": 135.58671688624784,
   "min_gradient_pct": 2.2294278756494066,
   "suppressed_max_gradient_pct": 21.96830242026519,
   "suppressed_location_m": [
    152.0,
    202.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.836654782147278,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 441.0,
   "end_distance_m": 541.0,
   "start_elevation_m": 122.09083587683993,
   "end_elevation_m": 141.9274906589872,
   "min_gradient_pct": 5.033021084834914
  }
 ],
 "shape": {
  "ascent_concentration": 0.354,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 218.0,
  "shape_class": "sustained"
 },
 "length_m": 655.3984361588522,
 "start_elevation_m": 76.21324412555433,
 "end_elevation_m": 155.26642009400493,
 "endpoint_gain_m": 79.0531759684506,
 "overall_gradient_pct": 12.061849953711226,
 "accumulated_ascent_m": 81.91138514331813,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.507468448952864,
   "start_distance_m": 193.0,
   "end_distance_m": 198.0,
   "midpoint_distance_m": 195.5,
   "start_elevation_m": 97.36092258254584,
   "end_elevation_m": 99.13629600499348,
   "start_xy": [
    436913.91471017816,
    4922216.736754738
   ],
   "end_xy": [
    436918.8276497704,
    4922215.807766167
   ]
  },
  "max_10m": {
   "gradient_pct": 29.928313089923222,
   "start_distance_m": 188.0,
   "end_distance_m": 198.0,
   "midpoint_distance_m": 193.0,
   "start_elevation_m": 96.14346469600116,
   "end_elevation_m": 99.13629600499348,
   "start_xy": [
    436909.00177058566,
    4922217.665743307
   ],
   "end_xy": [
    436918.8276497704,
    4922215.807766167
   ]
  },
  "max_20m": {
   "gradient_pct": 25.70112321812303,
   "start_distance_m": 182.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 192.0,
   "start_elevation_m": 94.96731062860539,
   "end_elevation_m": 100.10753527223,
   "start_xy": [
    436903.10629669746,
    4922218.7808134565
   ],
   "end_xy": [
    436922.7580552546,
    4922215.064859188
   ]
  },
  "max_25m": {
   "gradient_pct": 22.727779816178327,
   "start_distance_m": 183.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 195.5,
   "start_elevation_m": 95.10412129934736,
   "end_elevation_m": 100.78606625339194,
   "start_xy": [
    436904.0888309934,
    4922218.594731878
   ],
   "end_xy": [
    436928.65354795655,
    4922213.949888736
   ]
  },
  "max_50m": {
   "gradient_pct": 20.681408562659954,
   "start_distance_m": 457.0,
   "end_distance_m": 507.0,
   "midpoint_distance_m": 482.0,
   "start_elevation_m": 125.24601260491787,
   "end_elevation_m": 135.58671688624784,
   "start_xy": [
    437172.0355635756,
    4922161.930158586
   ],
   "end_xy": [
    437220.4594564522,
    4922149.475186113
   ]
  },
  "max_100m": {
   "gradient_pct": 19.836654782147278,
   "start_distance_m": 441.0,
   "end_distance_m": 541.0,
   "midpoint_distance_m": 491.0,
   "start_elevation_m": 122.09083587683993,
   "end_elevation_m": 141.9274906589872,
   "start_xy": [
    437156.54005020094,
    4922165.916263946
   ],
   "end_xy": [
    437253.38781104377,
    4922141.006222354
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.742883763778877,
   "start_distance_m": 126.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 128.5,
   "start_elevation_m": 90.473125925314,
   "end_elevation_m": 89.38598173712505,
   "start_xy": [
    436866.6302517515,
    4922245.4045938365
   ],
   "end_xy": [
    436867.1502400027,
    4922240.431706129
   ]
  },
  "min_10m": {
   "gradient_pct": -17.852354970922732,
   "start_distance_m": 125.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 130.0,
   "start_elevation_m": 90.55962262045698,
   "end_elevation_m": 88.7743871233647,
   "start_xy": [
    436866.5262952057,
    4922246.3991756765
   ],
   "end_xy": [
    436867.5662720017,
    4922236.4534002915
   ]
  },
  "min_20m": {
   "gradient_pct": -10.719323158075653,
   "start_distance_m": 126.0,
   "end_distance_m": 146.0,
   "midpoint_distance_m": 136.0,
   "start_elevation_m": 90.473125925314,
   "end_elevation_m": 88.32926129369886,
   "start_xy": [
    436866.6302517515,
    4922245.4045938365
   ],
   "end_xy": [
    436868.7093753323,
    4922225.512957348
   ]
  },
  "min_25m": {
   "gradient_pct": -8.497095597030977,
   "start_distance_m": 122.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 134.5,
   "start_elevation_m": 90.39370410666669,
   "end_elevation_m": 88.26943020740894,
   "start_xy": [
    436865.98367486557,
    4922249.334975404
   ],
   "end_xy": [
    436868.8355461591,
    4922224.52225776
   ]
  },
  "min_50m": {
   "gradient_pct": 2.2294278756494066,
   "start_distance_m": 97.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 87.15471626958424,
   "end_elevation_m": 88.26943020740894,
   "start_xy": [
    436857.8656159291,
    4922272.980207172
   ],
   "end_xy": [
    436868.8355461591,
    4922224.52225776
   ]
  },
  "min_100m": {
   "gradient_pct": 5.033021084834914,
   "start_distance_m": 291.0,
   "end_distance_m": 391.0,
   "midpoint_distance_m": 341.0,
   "start_elevation_m": 111.4097323502481,
   "end_elevation_m": 116.44275343508302,
   "start_xy": [
    437010.20855450135,
    4922198.529784193
   ],
   "end_xy": [
    437108.1161641975,
    4922178.371261212
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.70086025126787,
   "start_distance_m": 58.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 59.0,
   "start_elevation_m": 83.45413870950433,
   "end_elevation_m": 84.30815591452969,
   "start_xy": [
    436835.5779758293,
    4922303.436021093
   ],
   "end_xy": [
    436837.08492421795,
    4922302.1210661335
   ]
  },
  "max_3m": {
   "gradient_pct": 40.87556597734524,
   "start_distance_m": 194.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 195.5,
   "start_elevation_m": 97.65747572375719,
   "end_elevation_m": 98.88374270307754,
   "start_xy": [
    436914.8972942644,
    4922216.550936482
   ],
   "end_xy": [
    436917.845115481,
    4922215.993847781
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.087,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.119,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.697,
   "obstruction_max_height_m": 26.44,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    100.0,
    171.0
   ],
   [
    262.0,
    267.0
   ]
  ],
  "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/me/USGS_1M_19_x43y493_ME_SouthCentral_B22.tif"
  ],
  "calculated_at": "2026-09-03T22:41:15+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/maine-2026-08-22.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "canopy-tail-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, ME_SouthCentral_B22 (collected 2022)",
  "elevation_tile_ids": [
   "x43y493"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_ME_NRCS_Lot4_2013_LAS_2015",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.988,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "mask_ranges_m": [
   [
    126.0,
    166.0
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Sidney",
  "county": "Maine"
 }
}