{
 "ocl_version": "0.1.0",
 "name": "Nells Hill Road",
 "slug": "nells-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 31.11711563296211,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 109.79957086169912,
   "end_elevation_m": 110.42191317435837,
   "min_gradient_pct": -5.506937793535371
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.47803417388286,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 75.0,
   "start_elevation_m": 109.79957086169912,
   "end_elevation_m": 110.68391188691561,
   "min_gradient_pct": -4.821776530529102
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.64619484933553,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 113.0,
   "end_distance_m": 118.0,
   "start_elevation_m": 115.35960732226255,
   "end_elevation_m": 116.69191706472932,
   "min_gradient_pct": -4.028299192391955
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.866998484335113,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 111.0,
   "end_distance_m": 121.0,
   "start_elevation_m": 114.87287842709281,
   "end_elevation_m": 117.45957827552633,
   "min_gradient_pct": -2.387058468128629
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.31503560865859,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 105.0,
   "end_distance_m": 125.0,
   "start_elevation_m": 113.8643981795319,
   "end_elevation_m": 118.12740530126362,
   "min_gradient_pct": -0.9248340084046447
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.231106208169763,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 105.0,
   "end_distance_m": 130.0,
   "start_elevation_m": 113.8643981795319,
   "end_elevation_m": 118.92217473157434,
   "min_gradient_pct": -0.44351327677622976
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.31835363194719,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 112.07761196273724,
   "end_elevation_m": 120.23678877871083,
   "min_gradient_pct": 1.2551596491160808
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.703829869422206,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 159.0,
   "start_elevation_m": 108.19921667478788,
   "end_elevation_m": 121.90304654421008,
   "min_gradient_pct": 6.162464447243438
  }
 ],
 "shape": {
  "ascent_concentration": 0.373,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 64.0,
  "shape_class": "sustained"
 },
 "length_m": 383.4968623053093,
 "start_elevation_m": 107.08073141301563,
 "end_elevation_m": 142.87635460142937,
 "endpoint_gain_m": 35.79562318841374,
 "overall_gradient_pct": 9.334006795580025,
 "accumulated_ascent_m": 36.22971554544958,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.64619484933553,
   "start_distance_m": 113.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 115.5,
   "start_elevation_m": 115.35960732226255,
   "end_elevation_m": 116.69191706472932,
   "start_xy": [
    471510.7997340343,
    4908365.324067575
   ],
   "end_xy": [
    471505.80599727115,
    4908365.0738813635
   ]
  },
  "max_10m": {
   "gradient_pct": 25.866998484335113,
   "start_distance_m": 111.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 116.0,
   "start_elevation_m": 114.87287842709281,
   "end_elevation_m": 117.45957827552633,
   "start_xy": [
    471512.79722873954,
    4908365.42414206
   ],
   "end_xy": [
    471502.95252064837,
    4908365.691198413
   ]
  },
  "max_20m": {
   "gradient_pct": 21.31503560865859,
   "start_distance_m": 105.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 113.8643981795319,
   "end_elevation_m": 118.12740530126362,
   "start_xy": [
    471518.2965733261,
    4908367.519702906
   ],
   "end_xy": [
    471499.4148101882,
    4908367.50151927
   ]
  },
  "max_25m": {
   "gradient_pct": 20.231106208169763,
   "start_distance_m": 105.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 117.5,
   "start_elevation_m": 113.8643981795319,
   "end_elevation_m": 118.92217473157434,
   "start_xy": [
    471518.2965733261,
    4908367.519702906
   ],
   "end_xy": [
    471495.89151689806,
    4908370.98807618
   ]
  },
  "max_50m": {
   "gradient_pct": 16.31835363194719,
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 112.07761196273724,
   "end_elevation_m": 120.23678877871083,
   "start_xy": [
    471531.5591698729,
    4908374.527094206
   ],
   "end_xy": [
    471490.6735465153,
    4908379.518772816
   ]
  },
  "max_100m": {
   "gradient_pct": 13.703829869422206,
   "start_distance_m": 59.0,
   "end_distance_m": 159.0,
   "midpoint_distance_m": 109.0,
   "start_elevation_m": 108.19921667478788,
   "end_elevation_m": 121.90304654421008,
   "start_xy": [
    471560.55447374674,
    4908377.5428659525
   ],
   "end_xy": [
    471480.7594027881,
    4908395.7270964235
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.028299192391955,
   "start_distance_m": 2.0,
   "end_distance_m": 7.0,
   "midpoint_distance_m": 4.5,
   "start_elevation_m": 107.09714251363803,
   "end_elevation_m": 106.89572755401844,
   "start_xy": [
    471601.1883636634,
    4908338.096916489
   ],
   "end_xy": [
    471597.224272822,
    4908341.144207712
   ]
  },
  "min_10m": {
   "gradient_pct": -2.387058468128629,
   "start_distance_m": 2.0,
   "end_distance_m": 12.0,
   "midpoint_distance_m": 7.0,
   "start_elevation_m": 107.09714251363803,
   "end_elevation_m": 106.85843666682517,
   "start_xy": [
    471601.1883636634,
    4908338.096916489
   ],
   "end_xy": [
    471593.26018198056,
    4908344.191498936
   ]
  },
  "min_20m": {
   "gradient_pct": -0.9248340084046447,
   "start_distance_m": 1.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 11.0,
   "start_elevation_m": 107.09850039523096,
   "end_elevation_m": 106.91353359355003,
   "start_xy": [
    471601.9811818317,
    4908337.487458244
   ],
   "end_xy": [
    471586.3111826496,
    4908349.866082915
   ]
  },
  "min_25m": {
   "gradient_pct": -0.44351327677622976,
   "start_distance_m": 1.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 13.5,
   "start_elevation_m": 107.09850039523096,
   "end_elevation_m": 106.9876220760369,
   "start_xy": [
    471601.9811818317,
    4908337.487458244
   ],
   "end_xy": [
    471583.1990063433,
    4908353.779439356
   ]
  },
  "min_50m": {
   "gradient_pct": 1.2551596491160808,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 107.08073141301563,
   "end_elevation_m": 107.70831123757367,
   "start_xy": [
    471602.774,
    4908336.878
   ],
   "end_xy": [
    471567.4912612875,
    4908371.808672145
   ]
  },
  "min_100m": {
   "gradient_pct": 6.162464447243438,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 107.08073141301563,
   "end_elevation_m": 113.24319586025906,
   "start_xy": [
    471602.774,
    4908336.878
   ],
   "end_xy": [
    471522.7174388417,
    4908369.855500006
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 31.11711563296211,
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 73.0,
   "start_elevation_m": 109.79957086169912,
   "end_elevation_m": 110.42191317435837,
   "start_xy": [
    471548.0507013648,
    4908380.630900365
   ],
   "end_xy": [
    471546.0727996529,
    4908380.927387833
   ]
  },
  "max_3m": {
   "gradient_pct": 29.47803417388286,
   "start_distance_m": 72.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 73.5,
   "start_elevation_m": 109.79957086169912,
   "end_elevation_m": 110.68391188691561,
   "start_xy": [
    471548.0507013648,
    4908380.630900365
   ],
   "end_xy": [
    471545.10064240335,
    4908380.882372315
   ]
  }
 },
 "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_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_x47y491_ME_MidCoast_2021_B21.tif"
  ],
  "calculated_at": "2026-08-24T20:47:23+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-3-260824",
  "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": [
   "x47y491"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.3% over 200 m (Terrain 50), gain 36.4 m over 383 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": "Liberty",
  "county": "Maine"
 }
}