{
 "ocl_version": "0.1.0",
 "name": "Butterfield Road",
 "slug": "butterfield-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.83184795593189,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 906.0,
   "end_distance_m": 908.0,
   "start_elevation_m": 187.48254837018968,
   "end_elevation_m": 188.3791853293083,
   "min_gradient_pct": -33.062397780507524
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.767521715218855,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 905.0,
   "end_distance_m": 908.0,
   "start_elevation_m": 187.18615967785175,
   "end_elevation_m": 188.3791853293083,
   "min_gradient_pct": -32.392506480681504
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.4557564502079,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 931.0,
   "end_distance_m": 936.0,
   "start_elevation_m": 189.8761763306839,
   "end_elevation_m": 191.6489641531943,
   "min_gradient_pct": -27.297714902654207
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.477178867323005,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 470.0,
   "end_distance_m": 480.0,
   "start_elevation_m": 168.9726271157116,
   "end_elevation_m": 172.0203450024439,
   "min_gradient_pct": -20.51804669262907
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.652222324029424,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 470.0,
   "end_distance_m": 490.0,
   "start_elevation_m": 168.9726271157116,
   "end_elevation_m": 174.70307158051747,
   "min_gradient_pct": -17.746040706985156
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.01443261561917,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 464.0,
   "end_distance_m": 489.0,
   "start_elevation_m": 167.48961079941805,
   "end_elevation_m": 174.49321895332284,
   "min_gradient_pct": -17.054888222828367
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.90040257611844,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 444.0,
   "end_distance_m": 494.0,
   "start_elevation_m": 165.22766057316318,
   "end_elevation_m": 175.6778618612224,
   "min_gradient_pct": -9.82529934413435
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.81578831607996,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1128.0,
   "end_distance_m": 1228.0,
   "start_elevation_m": 201.56943486616348,
   "end_elevation_m": 218.38522318224344,
   "min_gradient_pct": -5.9759922676574035
  }
 ],
 "shape": {
  "ascent_concentration": 0.299,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 154.0,
  "shape_class": "sustained"
 },
 "length_m": 2929.278205923152,
 "start_elevation_m": 148.53585473632918,
 "end_elevation_m": 295.69172558594767,
 "endpoint_gain_m": 147.15587084961848,
 "overall_gradient_pct": 5.023622220383905,
 "accumulated_ascent_m": 192.44558122339703,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.4557564502079,
   "start_distance_m": 931.0,
   "end_distance_m": 936.0,
   "midpoint_distance_m": 933.5,
   "start_elevation_m": 189.8761763306839,
   "end_elevation_m": 191.6489641531943,
   "start_xy": [
    396356.92957781843,
    4937377.420714028
   ],
   "end_xy": [
    396357.311404758,
    4937382.40611353
   ]
  },
  "max_10m": {
   "gradient_pct": 30.477178867323005,
   "start_distance_m": 470.0,
   "end_distance_m": 480.0,
   "midpoint_distance_m": 475.0,
   "start_elevation_m": 168.9726271157116,
   "end_elevation_m": 172.0203450024439,
   "start_xy": [
    396429.19249008317,
    4936928.561297417
   ],
   "end_xy": [
    396425.2995144085,
    4936937.772417892
   ]
  },
  "max_20m": {
   "gradient_pct": 28.652222324029424,
   "start_distance_m": 470.0,
   "end_distance_m": 490.0,
   "midpoint_distance_m": 480.0,
   "start_elevation_m": 168.9726271157116,
   "end_elevation_m": 174.70307158051747,
   "start_xy": [
    396429.19249008317,
    4936928.561297417
   ],
   "end_xy": [
    396421.4065387338,
    4936946.983538366
   ]
  },
  "max_25m": {
   "gradient_pct": 28.01443261561917,
   "start_distance_m": 464.0,
   "end_distance_m": 489.0,
   "midpoint_distance_m": 476.5,
   "start_elevation_m": 167.48961079941805,
   "end_elevation_m": 174.49321895332284,
   "start_xy": [
    396431.528275488,
    4936923.034625133
   ],
   "end_xy": [
    396421.7958363013,
    4936946.062426318
   ]
  },
  "max_50m": {
   "gradient_pct": 20.90040257611844,
   "start_distance_m": 444.0,
   "end_distance_m": 494.0,
   "midpoint_distance_m": 469.0,
   "start_elevation_m": 165.22766057316318,
   "end_elevation_m": 175.6778618612224,
   "start_xy": [
    396439.3142268374,
    4936904.612384183
   ],
   "end_xy": [
    396419.84934846393,
    4936950.667986556
   ]
  },
  "max_100m": {
   "gradient_pct": 16.81578831607996,
   "start_distance_m": 1128.0,
   "end_distance_m": 1228.0,
   "midpoint_distance_m": 1178.0,
   "start_elevation_m": 201.56943486616348,
   "end_elevation_m": 218.38522318224344,
   "start_xy": [
    396352.16239177674,
    4937574.137016419
   ],
   "end_xy": [
    396338.21688036807,
    4937672.9458335
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -27.297714902654207,
   "start_distance_m": 899.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 901.5,
   "start_elevation_m": 188.60200729691758,
   "end_elevation_m": 187.23712155178487,
   "start_xy": [
    396354.485885405,
    4937345.51415722
   ],
   "end_xy": [
    396354.86771234457,
    4937350.499556721
   ]
  },
  "min_10m": {
   "gradient_pct": -20.51804669262907,
   "start_distance_m": 1665.0,
   "end_distance_m": 1675.0,
   "midpoint_distance_m": 1670.0,
   "start_elevation_m": 226.67935159774117,
   "end_elevation_m": 224.62754692847827,
   "start_xy": [
    396400.49747332116,
    4938099.615015104
   ],
   "end_xy": [
    396405.514913126,
    4938108.265176826
   ]
  },
  "min_20m": {
   "gradient_pct": -17.746040706985156,
   "start_distance_m": 502.0,
   "end_distance_m": 522.0,
   "midpoint_distance_m": 512.0,
   "start_elevation_m": 175.37673067188837,
   "end_elevation_m": 171.82752253049134,
   "start_xy": [
    396416.73496792413,
    4936958.036882936
   ],
   "end_xy": [
    396408.94901657477,
    4936976.459123884
   ]
  },
  "min_25m": {
   "gradient_pct": -17.054888222828367,
   "start_distance_m": 499.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 511.5,
   "start_elevation_m": 175.76741911180216,
   "end_elevation_m": 171.50369705609506,
   "start_xy": [
    396417.9028606266,
    4936955.2735467935
   ],
   "end_xy": [
    396408.1704214398,
    4936978.301347979
   ]
  },
  "min_50m": {
   "gradient_pct": -9.82529934413435,
   "start_distance_m": 497.0,
   "end_distance_m": 547.0,
   "midpoint_distance_m": 522.0,
   "start_elevation_m": 175.93112640417,
   "end_elevation_m": 171.0184767321028,
   "start_xy": [
    396418.6814557615,
    4936953.4313226985
   ],
   "end_xy": [
    396399.216577388,
    4936999.486925071
   ]
  },
  "min_100m": {
   "gradient_pct": -5.9759922676574035,
   "start_distance_m": 1414.0,
   "end_distance_m": 1514.0,
   "midpoint_distance_m": 1464.0,
   "start_elevation_m": 230.40293377155888,
   "end_elevation_m": 224.42694150390147,
   "start_xy": [
    396338.5164023937,
    4937856.7919079065
   ],
   "end_xy": [
    396362.1573645126,
    4937953.957256205
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.83184795593189,
   "start_distance_m": 906.0,
   "end_distance_m": 908.0,
   "midpoint_distance_m": 907.0,
   "start_elevation_m": 187.48254837018968,
   "end_elevation_m": 188.3791853293083,
   "start_xy": [
    396355.0204431204,
    4937352.493716521
   ],
   "end_xy": [
    396355.1731738962,
    4937354.487876322
   ]
  },
  "max_3m": {
   "gradient_pct": 39.767521715218855,
   "start_distance_m": 905.0,
   "end_distance_m": 908.0,
   "midpoint_distance_m": 906.5,
   "start_elevation_m": 187.18615967785175,
   "end_elevation_m": 188.3791853293083,
   "start_xy": [
    396354.9440777325,
    4937351.496636622
   ],
   "end_xy": [
    396355.1731738962,
    4937354.487876322
   ]
  }
 },
 "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": []
 },
 "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_x39y494_ME_WesternMtns_B24.tif"
  ],
  "calculated_at": "2026-08-24T20:34:13+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-2-260824",
  "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_WesternMtns_B24 (collected 2024)",
  "elevation_tile_ids": [
   "x39y494"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.2% over 200 m (Terrain 50), gain 147.4 m over 2929 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep,qualified-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": "Wilton",
  "county": "Maine"
 }
}