{
 "ocl_version": "0.1.0",
 "name": "Seiders Hill Lane",
 "slug": "seiders-hill-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.552617698272172,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 543.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 72.1868867639468,
   "end_elevation_m": 72.67793911791225,
   "min_gradient_pct": -13.074605001922635
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.424295653869365,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 542.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 71.97521024829616,
   "end_elevation_m": 72.67793911791225,
   "min_gradient_pct": -11.296101787697902
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.20516175403668,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 540.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 71.51768103021041,
   "end_elevation_m": 72.67793911791225,
   "min_gradient_pct": -4.850739696982629
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.245662000999417,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 459.0,
   "start_elevation_m": 56.26388384014852,
   "end_elevation_m": 58.388450040248465,
   "min_gradient_pct": -4.729002016096473
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.71041043402925,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 466.0,
   "end_distance_m": 486.0,
   "start_elevation_m": 59.744438618414875,
   "end_elevation_m": 63.886520705220725,
   "min_gradient_pct": -4.472094763748089
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.66249596824514,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 56.26388384014852,
   "end_elevation_m": 61.42950783220981,
   "min_gradient_pct": -4.34473181490236
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.76397845238452,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 441.0,
   "end_distance_m": 491.0,
   "start_elevation_m": 54.893073504177906,
   "end_elevation_m": 64.77506273037017,
   "min_gradient_pct": -3.4799898908804465
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.01538003134616,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 405.0,
   "end_distance_m": 505.0,
   "start_elevation_m": 48.980418781710306,
   "end_elevation_m": 66.99579881305647,
   "min_gradient_pct": -2.0516086316090636
  }
 ],
 "shape": {
  "ascent_concentration": 0.507,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 173.0,
  "shape_class": "stepped"
 },
 "length_m": 675.5134042113906,
 "start_elevation_m": 33.31752481506488,
 "end_elevation_m": 83.98922102892598,
 "endpoint_gain_m": 50.671696213861104,
 "overall_gradient_pct": 7.501212544111745,
 "accumulated_ascent_m": 53.30821360255376,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.20516175403668,
   "start_distance_m": 540.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 542.5,
   "start_elevation_m": 71.51768103021041,
   "end_elevation_m": 72.67793911791225,
   "start_xy": [
    476977.6051375541,
    4892829.112439632
   ],
   "end_xy": [
    476972.650308977,
    4892828.44186244
   ]
  },
  "max_10m": {
   "gradient_pct": 21.245662000999417,
   "start_distance_m": 449.0,
   "end_distance_m": 459.0,
   "midpoint_distance_m": 454.0,
   "start_elevation_m": 56.26388384014852,
   "end_elevation_m": 58.388450040248465,
   "start_xy": [
    477066.8006718546,
    4892845.562312113
   ],
   "end_xy": [
    477057.30913611315,
    4892842.414177861
   ]
  },
  "max_20m": {
   "gradient_pct": 20.71041043402925,
   "start_distance_m": 466.0,
   "end_distance_m": 486.0,
   "midpoint_distance_m": 476.0,
   "start_elevation_m": 59.744438618414875,
   "end_elevation_m": 63.886520705220725,
   "start_xy": [
    477050.6650610942,
    4892840.210483884
   ],
   "end_xy": [
    477031.1172861871,
    4892836.354673312
   ]
  },
  "max_25m": {
   "gradient_pct": 20.66249596824514,
   "start_distance_m": 449.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 461.5,
   "start_elevation_m": 56.26388384014852,
   "end_elevation_m": 61.42950783220981,
   "start_xy": [
    477066.8006718546,
    4892845.562312113
   ],
   "end_xy": [
    477043.0088747722,
    4892837.964058574
   ]
  },
  "max_50m": {
   "gradient_pct": 19.76397845238452,
   "start_distance_m": 441.0,
   "end_distance_m": 491.0,
   "midpoint_distance_m": 466.0,
   "start_elevation_m": 54.893073504177906,
   "end_elevation_m": 64.77506273037017,
   "start_xy": [
    477074.3939004477,
    4892848.0808195155
   ],
   "end_xy": [
    477026.16245760996,
    4892835.684096119
   ]
  },
  "max_100m": {
   "gradient_pct": 18.01538003134616,
   "start_distance_m": 405.0,
   "end_distance_m": 505.0,
   "midpoint_distance_m": 455.0,
   "start_elevation_m": 48.980418781710306,
   "end_elevation_m": 66.99579881305647,
   "start_xy": [
    477108.5634291167,
    4892859.4141028235
   ],
   "end_xy": [
    477012.288937594,
    4892833.80647998
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.850739696982629,
   "start_distance_m": 230.0,
   "end_distance_m": 235.0,
   "midpoint_distance_m": 232.5,
   "start_elevation_m": 44.28216340852138,
   "end_elevation_m": 44.039626423672246,
   "start_xy": [
    477246.4130699224,
    4892926.113126838
   ],
   "end_xy": [
    477244.06960406277,
    4892921.696321684
   ]
  },
  "min_10m": {
   "gradient_pct": -4.729002016096473,
   "start_distance_m": 225.0,
   "end_distance_m": 235.0,
   "midpoint_distance_m": 230.0,
   "start_elevation_m": 44.51252662528189,
   "end_elevation_m": 44.039626423672246,
   "start_xy": [
    477248.7565357821,
    4892930.529931991
   ],
   "end_xy": [
    477244.06960406277,
    4892921.696321684
   ]
  },
  "min_20m": {
   "gradient_pct": -4.472094763748089,
   "start_distance_m": 224.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 234.0,
   "start_elevation_m": 44.56731263475656,
   "end_elevation_m": 43.67289368200694,
   "start_xy": [
    477249.225228954,
    4892931.413293022
   ],
   "end_xy": [
    477239.8513655154,
    4892913.746072408
   ]
  },
  "min_25m": {
   "gradient_pct": -4.34473181490236,
   "start_distance_m": 223.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 235.5,
   "start_elevation_m": 44.60759493115322,
   "end_elevation_m": 43.52141197742763,
   "start_xy": [
    477249.6939221259,
    4892932.296654053
   ],
   "end_xy": [
    477237.97659282765,
    4892910.2126282845
   ]
  },
  "min_50m": {
   "gradient_pct": -3.4799898908804465,
   "start_distance_m": 215.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 240.0,
   "start_elevation_m": 44.78255697789286,
   "end_elevation_m": 43.042562032452636,
   "start_xy": [
    477253.4434675014,
    4892939.363542299
   ],
   "end_xy": [
    477230.0088089048,
    4892895.195490763
   ]
  },
  "min_100m": {
   "gradient_pct": -2.0516086316090636,
   "start_distance_m": 205.0,
   "end_distance_m": 305.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 44.76312936329059,
   "end_elevation_m": 42.711520731681524,
   "start_xy": [
    477258.1303992207,
    4892948.197152605
   ],
   "end_xy": [
    477207.6236880099,
    4892865.855413366
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.552617698272172,
   "start_distance_m": 543.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 544.0,
   "start_elevation_m": 72.1868867639468,
   "end_elevation_m": 72.67793911791225,
   "start_xy": [
    476974.6322404078,
    4892828.710093317
   ],
   "end_xy": [
    476972.650308977,
    4892828.44186244
   ]
  },
  "max_3m": {
   "gradient_pct": 23.424295653869365,
   "start_distance_m": 542.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 543.5,
   "start_elevation_m": 71.97521024829616,
   "end_elevation_m": 72.67793911791225,
   "start_xy": [
    476975.62320612324,
    4892828.844208755
   ],
   "end_xy": [
    476972.650308977,
    4892828.44186244
   ]
  }
 },
 "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": {
  "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_x47y490_ME_MidCoast_2021_B21.tif"
  ],
  "calculated_at": "2026-08-24T20:46:46+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, ME_MidCoast_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x47y490"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.3% over 200 m (Terrain 50), gain 41.3 m over 377 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. 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": "Union",
  "county": "Maine"
 }
}