{
 "ocl_version": "0.1.0",
 "name": "Larry Brook Road",
 "slug": "larry-brook-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.68288204903206,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 497.0,
   "end_distance_m": 499.0,
   "start_elevation_m": 643.6682620761762,
   "end_elevation_m": 644.6019197171569,
   "min_gradient_pct": -27.000373488920104
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.59520512043476,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 496.0,
   "end_distance_m": 499.0,
   "start_elevation_m": 643.3540635635438,
   "end_elevation_m": 644.6019197171569,
   "min_gradient_pct": -21.419016260525343
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 32.97306713502849,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 494.0,
   "end_distance_m": 499.0,
   "start_elevation_m": 642.9532663604055,
   "end_elevation_m": 644.6019197171569,
   "min_gradient_pct": -17.846603908142242
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.220314517273664,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 608.0,
   "end_distance_m": 618.0,
   "start_elevation_m": 656.9532899136061,
   "end_elevation_m": 659.5753213653335,
   "min_gradient_pct": -8.978581465682964
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.191790713414434,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 602.0,
   "end_distance_m": 622.0,
   "start_elevation_m": 655.9454608829692,
   "end_elevation_m": 660.3838190256521,
   "min_gradient_pct": -5.526275205660909
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.29304809752057,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 600.0,
   "end_distance_m": 625.0,
   "start_elevation_m": 655.5460436929942,
   "end_elevation_m": 660.8693057173743,
   "min_gradient_pct": -5.130703945624191
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.363912075741382,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 600.0,
   "end_distance_m": 650.0,
   "start_elevation_m": 655.5460436929942,
   "end_elevation_m": 664.2279997308649,
   "min_gradient_pct": -4.340057996918858
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.70493971532062,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 537.0,
   "end_distance_m": 637.0,
   "start_elevation_m": 647.8017549925014,
   "end_elevation_m": 662.506694707822,
   "min_gradient_pct": -2.601761141738848
  }
 ],
 "shape": {
  "ascent_concentration": 0.405,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 81.0,
  "shape_class": "sustained"
 },
 "length_m": 1723.828288045325,
 "start_elevation_m": 601.7230887070198,
 "end_elevation_m": 715.9814831293883,
 "endpoint_gain_m": 114.2583944223685,
 "overall_gradient_pct": 6.628177250294913,
 "accumulated_ascent_m": 135.76610085509571,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 32.97306713502849,
   "start_distance_m": 494.0,
   "end_distance_m": 499.0,
   "midpoint_distance_m": 496.5,
   "start_elevation_m": 642.9532663604055,
   "end_elevation_m": 644.6019197171569,
   "start_xy": [
    361720.5717328514,
    5009223.802928738
   ],
   "end_xy": [
    361725.5704866608,
    5009223.91455469
   ]
  },
  "max_10m": {
   "gradient_pct": 26.220314517273664,
   "start_distance_m": 608.0,
   "end_distance_m": 618.0,
   "midpoint_distance_m": 613.0,
   "start_elevation_m": 656.9532899136061,
   "end_elevation_m": 659.5753213653335,
   "start_xy": [
    361833.91401399433,
    5009230.348470964
   ],
   "end_xy": [
    361843.86346163676,
    5009229.344234134
   ]
  },
  "max_20m": {
   "gradient_pct": 22.191790713414434,
   "start_distance_m": 602.0,
   "end_distance_m": 622.0,
   "midpoint_distance_m": 612.0,
   "start_elevation_m": 655.9454608829692,
   "end_elevation_m": 660.3838190256521,
   "start_xy": [
    361827.94434540893,
    5009230.951013062
   ],
   "end_xy": [
    361847.84324069374,
    5009228.942539401
   ]
  },
  "max_25m": {
   "gradient_pct": 21.29304809752057,
   "start_distance_m": 600.0,
   "end_distance_m": 625.0,
   "midpoint_distance_m": 612.5,
   "start_elevation_m": 655.5460436929942,
   "end_elevation_m": 660.8693057173743,
   "start_xy": [
    361825.95445588045,
    5009231.151860428
   ],
   "end_xy": [
    361850.8280749864,
    5009228.641268353
   ]
  },
  "max_50m": {
   "gradient_pct": 17.363912075741382,
   "start_distance_m": 600.0,
   "end_distance_m": 650.0,
   "midpoint_distance_m": 625.0,
   "start_elevation_m": 655.5460436929942,
   "end_elevation_m": 664.2279997308649,
   "start_xy": [
    361825.95445588045,
    5009231.151860428
   ],
   "end_xy": [
    361875.71305439196,
    5009226.738957442
   ]
  },
  "max_100m": {
   "gradient_pct": 14.70493971532062,
   "start_distance_m": 537.0,
   "end_distance_m": 637.0,
   "midpoint_distance_m": 587.0,
   "start_elevation_m": 647.8017549925014,
   "end_elevation_m": 662.506694707822,
   "start_xy": [
    361763.5610156123,
    5009224.762911919
   ],
   "end_xy": [
    361862.7674121573,
    5009227.436184157
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -17.846603908142242,
   "start_distance_m": 1541.0,
   "end_distance_m": 1546.0,
   "midpoint_distance_m": 1543.5,
   "start_elevation_m": 706.2258618815057,
   "end_elevation_m": 705.3335316860986,
   "start_xy": [
    362736.3871218496,
    5009380.309320539
   ],
   "end_xy": [
    362739.7462481923,
    5009384.012868866
   ]
  },
  "min_10m": {
   "gradient_pct": -8.978581465682964,
   "start_distance_m": 1278.0,
   "end_distance_m": 1288.0,
   "midpoint_distance_m": 1283.0,
   "start_elevation_m": 698.6455326648927,
   "end_elevation_m": 697.7476745183244,
   "start_xy": [
    362494.15024350176,
    5009292.238573436
   ],
   "end_xy": [
    362503.93001479347,
    5009294.325694295
   ]
  },
  "min_20m": {
   "gradient_pct": -5.526275205660909,
   "start_distance_m": 3.0,
   "end_distance_m": 23.0,
   "midpoint_distance_m": 13.0,
   "start_elevation_m": 601.6242693908633,
   "end_elevation_m": 600.5190143497312,
   "start_xy": [
    361446.3647274214,
    5008870.869573708
   ],
   "end_xy": [
    361450.610964461,
    5008890.4059701655
   ]
  },
  "min_25m": {
   "gradient_pct": -5.130703945624191,
   "start_distance_m": 4.0,
   "end_distance_m": 29.0,
   "midpoint_distance_m": 16.5,
   "start_elevation_m": 601.587461027307,
   "end_elevation_m": 600.3047850409009,
   "start_xy": [
    361446.6519698951,
    5008871.82743161
   ],
   "end_xy": [
    361451.8286419675,
    5008896.281109439
   ]
  },
  "min_50m": {
   "gradient_pct": -4.340057996918858,
   "start_distance_m": 1.0,
   "end_distance_m": 51.0,
   "midpoint_distance_m": 26.0,
   "start_elevation_m": 601.6945922583161,
   "end_elevation_m": 599.5245632598567,
   "start_xy": [
    361445.7902424738,
    5008868.953857902
   ],
   "end_xy": [
    361456.2934594913,
    5008917.823286778
   ]
  },
  "min_100m": {
   "gradient_pct": -2.601761141738848,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 601.7230887070198,
   "end_elevation_m": 599.1213275652809,
   "start_xy": [
    361445.503,
    5008867.996
   ],
   "end_xy": [
    361466.2378257942,
    5008965.80359085
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.68288204903206,
   "start_distance_m": 497.0,
   "end_distance_m": 499.0,
   "midpoint_distance_m": 498.0,
   "start_elevation_m": 643.6682620761762,
   "end_elevation_m": 644.6019197171569,
   "start_xy": [
    361723.570985137,
    5009223.8699043095
   ],
   "end_xy": [
    361725.5704866608,
    5009223.91455469
   ]
  },
  "max_3m": {
   "gradient_pct": 41.59520512043476,
   "start_distance_m": 496.0,
   "end_distance_m": 499.0,
   "midpoint_distance_m": 497.5,
   "start_elevation_m": 643.3540635635438,
   "end_elevation_m": 644.6019197171569,
   "start_xy": [
    361722.5712343752,
    5009223.847579119
   ],
   "end_xy": [
    361725.5704866608,
    5009223.91455469
   ]
  }
 },
 "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": 0.003,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    828.0,
    833.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_start",
   "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_x36y501_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-08-24T21:00:20+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": "redo-me-1-260824",
  "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_Umbagog_LiDAR_2016_D16 (collected 2016)",
  "elevation_tile_ids": [
   "x36y501"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.9% over 200 m (Terrain 50), gain 114.5 m over 1724 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "North Franklin",
  "county": "Maine"
 }
}