{
 "ocl_version": "0.1.0",
 "name": "Old Brookline Road",
 "slug": "old-brookline-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.37724506038967,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 589.0,
   "end_distance_m": 591.0,
   "start_elevation_m": 234.74061446200517,
   "end_elevation_m": 235.60815936321296,
   "min_gradient_pct": -24.968377791320506
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.55621924480113,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 589.0,
   "end_distance_m": 592.0,
   "start_elevation_m": 234.74061446200517,
   "end_elevation_m": 235.9273010393492,
   "min_gradient_pct": -24.294018002475088
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.45987972342357,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 192.0,
   "end_distance_m": 197.0,
   "start_elevation_m": 212.92898540758787,
   "end_elevation_m": 214.60197939375905,
   "min_gradient_pct": -22.97582227033729,
   "suppressed_max_gradient_pct": 33.91377343210536,
   "suppressed_location_m": [
    711.0,
    716.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.316071175037337,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 275.0,
   "end_distance_m": 285.0,
   "start_elevation_m": 218.92846094653447,
   "end_elevation_m": 221.5600680640382,
   "min_gradient_pct": -20.67849621365724,
   "suppressed_max_gradient_pct": 29.301584292921632,
   "suppressed_location_m": [
    649.0,
    659.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 18.32142091045597,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1048.0,
   "end_distance_m": 1068.0,
   "start_elevation_m": 282.407894881208,
   "end_elevation_m": 286.0721790632992,
   "min_gradient_pct": -16.058859685198428,
   "suppressed_max_gradient_pct": 22.046931663211353,
   "suppressed_location_m": [
    701.0,
    721.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 17.74266392821437,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1044.0,
   "end_distance_m": 1069.0,
   "start_elevation_m": 281.80669877952766,
   "end_elevation_m": 286.24236476158126,
   "min_gradient_pct": -13.897252176464576,
   "suppressed_max_gradient_pct": 21.032026804889142,
   "suppressed_location_m": [
    508.0,
    533.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.189664369764728,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 1105.0,
   "end_distance_m": 1155.0,
   "start_elevation_m": 291.46799310797314,
   "end_elevation_m": 299.5628252928555,
   "min_gradient_pct": -10.018718443841863,
   "suppressed_max_gradient_pct": 17.557211599415837,
   "suppressed_location_m": [
    922.0,
    972.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.97873397993709,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1052.0,
   "end_distance_m": 1152.0,
   "start_elevation_m": 283.07716805108123,
   "end_elevation_m": 299.0559020310183,
   "min_gradient_pct": -5.025805978835251
  }
 ],
 "shape": {
  "ascent_concentration": 0.351,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 },
 "length_m": 1245.3513196216684,
 "start_elevation_m": 202.6291134660181,
 "end_elevation_m": 310.3820679187338,
 "endpoint_gain_m": 107.7529544527157,
 "overall_gradient_pct": 8.652414202720765,
 "accumulated_ascent_m": 126.50819240116087,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.45987972342357,
   "start_distance_m": 192.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 194.5,
   "start_elevation_m": 212.92898540758787,
   "end_elevation_m": 214.60197939375905,
   "start_xy": [
    273931.993075246,
    4738634.594
   ],
   "end_xy": [
    273926.9930767479,
    4738634.597003924
   ]
  },
  "max_10m": {
   "gradient_pct": 26.316071175037337,
   "start_distance_m": 275.0,
   "end_distance_m": 285.0,
   "midpoint_distance_m": 280.0,
   "start_elevation_m": 218.92846094653447,
   "end_elevation_m": 221.5600680640382,
   "start_xy": [
    273850.90126503207,
    4738626.140957558
   ],
   "end_xy": [
    273841.8882837174,
    4738621.808966537
   ]
  },
  "max_20m": {
   "gradient_pct": 18.32142091045597,
   "start_distance_m": 1048.0,
   "end_distance_m": 1068.0,
   "midpoint_distance_m": 1058.0,
   "start_elevation_m": 282.407894881208,
   "end_elevation_m": 286.0721790632992,
   "start_xy": [
    273113.8958951025,
    4738687.987236528
   ],
   "end_xy": [
    273093.9077897709,
    4738687.427084006
   ]
  },
  "max_25m": {
   "gradient_pct": 17.74266392821437,
   "start_distance_m": 1044.0,
   "end_distance_m": 1069.0,
   "midpoint_distance_m": 1056.5,
   "start_elevation_m": 281.80669877952766,
   "end_elevation_m": 286.24236476158126,
   "start_xy": [
    273117.88347255497,
    4738688.302234034
   ],
   "end_xy": [
    273092.90797022206,
    4738687.408087434
   ]
  },
  "max_50m": {
   "gradient_pct": 16.189664369764728,
   "start_distance_m": 1105.0,
   "end_distance_m": 1155.0,
   "midpoint_distance_m": 1130.0,
   "start_elevation_m": 291.46799310797314,
   "end_elevation_m": 299.5628252928555,
   "start_xy": [
    273056.914566474,
    4738686.719079763
   ],
   "end_xy": [
    273006.9237482228,
    4738685.761083216
   ]
  },
  "max_100m": {
   "gradient_pct": 15.97873397993709,
   "start_distance_m": 1052.0,
   "end_distance_m": 1152.0,
   "midpoint_distance_m": 1102.0,
   "start_elevation_m": 283.07716805108123,
   "end_elevation_m": 299.0559020310183,
   "start_xy": [
    273109.9048429716,
    4738687.734085017
   ],
   "end_xy": [
    273009.9231870156,
    4738685.819091554
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -22.97582227033729,
   "start_distance_m": 314.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 316.5,
   "start_elevation_m": 218.41024851833956,
   "end_elevation_m": 217.2614574048227,
   "start_xy": [
    273815.7502690221,
    4738609.246959475
   ],
   "end_xy": [
    273811.24330106215,
    4738607.081956338
   ]
  },
  "min_10m": {
   "gradient_pct": -20.67849621365724,
   "start_distance_m": 310.0,
   "end_distance_m": 320.0,
   "midpoint_distance_m": 315.0,
   "start_elevation_m": 219.18899827489167,
   "end_elevation_m": 217.12114865352595,
   "start_xy": [
    273819.3553458852,
    4738610.979996413
   ],
   "end_xy": [
    273810.3423645702,
    4738606.648005393
   ]
  },
  "min_20m": {
   "gradient_pct": -16.058859685198428,
   "start_distance_m": 304.0,
   "end_distance_m": 324.0,
   "midpoint_distance_m": 314.0,
   "start_elevation_m": 219.98417406160388,
   "end_elevation_m": 216.7724021245642,
   "start_xy": [
    273824.76325033675,
    4738613.578950495
   ],
   "end_xy": [
    273806.7368933744,
    4738604.915788061
   ]
  },
  "min_25m": {
   "gradient_pct": -13.897252176464576,
   "start_distance_m": 296.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 308.5,
   "start_elevation_m": 220.48215794324858,
   "end_elevation_m": 217.00784489913244,
   "start_xy": [
    273831.9739788381,
    4738617.043829087
   ],
   "end_xy": [
    273809.4410410189,
    4738606.214858937
   ]
  },
  "min_50m": {
   "gradient_pct": -10.018718443841863,
   "start_distance_m": 286.0,
   "end_distance_m": 336.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 221.60265187414672,
   "end_elevation_m": 216.59329265222578,
   "start_xy": [
    273840.98696014925,
    4738621.375820115
   ],
   "end_xy": [
    273795.9210880277,
    4738599.717872493
   ]
  },
  "min_100m": {
   "gradient_pct": -5.025805978835251,
   "start_distance_m": 286.0,
   "end_distance_m": 386.0,
   "midpoint_distance_m": 336.0,
   "start_elevation_m": 221.60265187414672,
   "end_elevation_m": 216.57684589531146,
   "start_xy": [
    273840.98696014925,
    4738621.375820115
   ],
   "end_xy": [
    273749.31591670134,
    4738585.184959749
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.37724506038967,
   "start_distance_m": 589.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 590.0,
   "start_elevation_m": 234.74061446200517,
   "end_elevation_m": 235.60815936321296,
   "start_xy": [
    273553.4145481356,
    4738627.128618245
   ],
   "end_xy": [
    273551.61172058305,
    4738627.994535463
   ]
  },
  "max_3m": {
   "gradient_pct": 39.55621924480113,
   "start_distance_m": 589.0,
   "end_distance_m": 592.0,
   "midpoint_distance_m": 590.5,
   "start_elevation_m": 234.74061446200517,
   "end_elevation_m": 235.9273010393492,
   "start_xy": [
    273553.4145481356,
    4738627.128618245
   ],
   "end_xy": [
    273550.7102322258,
    4738628.42733875
   ]
  }
 },
 "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": {
  "texture_suppression": {
   "masked_fraction": 0.092,
   "windows_resited": [
    10.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 3,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 508.0,
     "end_m": 533.0,
     "raw_pct": 21.03,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 701.0,
     "end_m": 721.0,
     "raw_pct": 22.05,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 649.0,
     "end_m": 659.0,
     "raw_pct": 29.3,
     "reason": "hump+short-step"
    },
    {
     "window_m": 25.0,
     "start_m": 929.0,
     "end_m": 954.0,
     "raw_pct": 19.28,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 932.0,
     "end_m": 952.0,
     "raw_pct": 20.44,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 941.0,
     "end_m": 951.0,
     "raw_pct": 27.39,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 407.0,
     "end_m": 417.0,
     "raw_pct": 26.65,
     "reason": "short-step"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "excluded_ranges_m": [
   [
    405.0,
    419.0
   ],
   [
    506.0,
    535.0
   ],
   [
    647.0,
    661.0
   ],
   [
    699.0,
    723.0
   ],
   [
    927.0,
    956.0
   ]
  ],
  "review": [],
  "extent": [
   "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/nh/USGS_1M_19_x27y474_NH_Coastal_2019_B19.tif"
  ],
  "calculated_at": "2026-09-12T00:52:53+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "texture-us-nh-260911",
  "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, NH_Coastal_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
   "x27y474"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: NH_Coastal_2_2019: no corridor points fetched",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Mason",
  "county": "New Hampshire"
 }
}