{
 "ocl_version": "0.1.0",
 "name": "Perkins Valley Road",
 "slug": "perkins-valley-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.418663735368,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5199.0,
   "end_distance_m": 5201.0,
   "start_elevation_m": 422.15951322546755,
   "end_elevation_m": 422.9878865001749,
   "min_gradient_pct": -37.79377818857199,
   "suppressed_max_gradient_pct": 58.9736518425525,
   "suppressed_location_m": [
    5434.0,
    5436.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.19914942819393,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5199.0,
   "end_distance_m": 5202.0,
   "start_elevation_m": 422.15951322546755,
   "end_elevation_m": 423.36548770831337,
   "min_gradient_pct": -32.001121374857654,
   "suppressed_max_gradient_pct": 54.616472340478595,
   "suppressed_location_m": [
    5433.0,
    5436.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.99880893054865,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5197.0,
   "end_distance_m": 5202.0,
   "start_elevation_m": 421.61554726178593,
   "end_elevation_m": 423.36548770831337,
   "min_gradient_pct": -23.976268656806496,
   "suppressed_max_gradient_pct": 49.50238200975264,
   "suppressed_location_m": [
    5432.0,
    5437.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.524778947766208,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5195.0,
   "end_distance_m": 5205.0,
   "start_elevation_m": 420.97056571360787,
   "end_elevation_m": 423.9230436083845,
   "min_gradient_pct": -15.271327519109263,
   "suppressed_max_gradient_pct": 37.35946005918663,
   "suppressed_location_m": [
    5431.0,
    5441.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.061050788925,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5194.0,
   "end_distance_m": 5214.0,
   "start_elevation_m": 420.73966414882244,
   "end_elevation_m": 425.35187430660744,
   "min_gradient_pct": -10.084588423083858,
   "suppressed_max_gradient_pct": 27.02291061994032,
   "suppressed_location_m": [
    5421.0,
    5441.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.051475955660635,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 5194.0,
   "end_distance_m": 5219.0,
   "start_elevation_m": 420.73966414882244,
   "end_elevation_m": 426.2525331377376,
   "min_gradient_pct": -9.503854274905507,
   "suppressed_max_gradient_pct": 23.78194551431693,
   "suppressed_location_m": [
    5422.0,
    5447.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.883749737033554,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 4238.0,
   "end_distance_m": 4288.0,
   "start_elevation_m": 370.7069060162977,
   "end_elevation_m": 380.14878088481447,
   "min_gradient_pct": -8.470929060128356
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.878094173778152,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 4188.0,
   "end_distance_m": 4288.0,
   "start_elevation_m": 362.2706867110363,
   "end_elevation_m": 380.14878088481447,
   "min_gradient_pct": -4.87223402055514
  }
 ],
 "shape": {
  "ascent_concentration": 0.398,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 134.0,
  "shape_class": "sustained"
 },
 "length_m": 5631.1935718482155,
 "start_elevation_m": 182.3694553588912,
 "end_elevation_m": 455.09720012081584,
 "endpoint_gain_m": 272.72774476192467,
 "overall_gradient_pct": 4.843160535723026,
 "accumulated_ascent_m": 331.9727423805401,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.99880893054865,
   "start_distance_m": 5197.0,
   "end_distance_m": 5202.0,
   "midpoint_distance_m": 5199.5,
   "start_elevation_m": 421.61554726178593,
   "end_elevation_m": 423.36548770831337,
   "start_xy": [
    376448.5388416737,
    4916998.19377347
   ],
   "end_xy": [
    376451.7312163748,
    4917002.04198528
   ]
  },
  "max_10m": {
   "gradient_pct": 29.524778947766208,
   "start_distance_m": 5195.0,
   "end_distance_m": 5205.0,
   "midpoint_distance_m": 5200.0,
   "start_elevation_m": 420.97056571360787,
   "end_elevation_m": 423.9230436083845,
   "start_xy": [
    376447.262331401,
    4916996.654124104
   ],
   "end_xy": [
    376453.646353557,
    4917004.351150845
   ]
  },
  "max_20m": {
   "gradient_pct": 23.061050788925,
   "start_distance_m": 5194.0,
   "end_distance_m": 5214.0,
   "midpoint_distance_m": 5204.0,
   "start_elevation_m": 420.73966414882244,
   "end_elevation_m": 425.35187430660744,
   "start_xy": [
    376446.6237042582,
    4916995.884608098
   ],
   "end_xy": [
    376459.3923578486,
    4917011.278156024
   ]
  },
  "max_25m": {
   "gradient_pct": 22.051475955660635,
   "start_distance_m": 5194.0,
   "end_distance_m": 5219.0,
   "midpoint_distance_m": 5206.5,
   "start_elevation_m": 420.73966414882244,
   "end_elevation_m": 426.2525331377376,
   "start_xy": [
    376446.6237042582,
    4916995.884608098
   ],
   "end_xy": [
    376462.584597948,
    4917015.126480159
   ]
  },
  "max_50m": {
   "gradient_pct": 18.883749737033554,
   "start_distance_m": 4238.0,
   "end_distance_m": 4288.0,
   "midpoint_distance_m": 4263.0,
   "start_elevation_m": 370.7069060162977,
   "end_elevation_m": 380.14878088481447,
   "start_xy": [
    375934.8996009733,
    4916214.519646228
   ],
   "end_xy": [
    375954.9046600988,
    4916260.343190776
   ]
  },
  "max_100m": {
   "gradient_pct": 17.878094173778152,
   "start_distance_m": 4188.0,
   "end_distance_m": 4288.0,
   "midpoint_distance_m": 4238.0,
   "start_elevation_m": 362.2706867110363,
   "end_elevation_m": 380.14878088481447,
   "start_xy": [
    375919.4733315594,
    4916167.0339939175
   ],
   "end_xy": [
    375954.9046600988,
    4916260.343190776
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -23.976268656806496,
   "start_distance_m": 3375.0,
   "end_distance_m": 3380.0,
   "midpoint_distance_m": 3377.5,
   "start_elevation_m": 288.9377956671186,
   "end_elevation_m": 287.7389822342783,
   "start_xy": [
    375827.4048057177,
    4915395.179071669
   ],
   "end_xy": [
    375823.3399946661,
    4915398.090653265
   ]
  },
  "min_10m": {
   "gradient_pct": -15.271327519109263,
   "start_distance_m": 3370.0,
   "end_distance_m": 3380.0,
   "midpoint_distance_m": 3375.0,
   "start_elevation_m": 289.2661149861892,
   "end_elevation_m": 287.7389822342783,
   "start_xy": [
    375831.46982216847,
    4915392.26777675
   ],
   "end_xy": [
    375823.3399946661,
    4915398.090653265
   ]
  },
  "min_20m": {
   "gradient_pct": -10.084588423083858,
   "start_distance_m": 4635.0,
   "end_distance_m": 4655.0,
   "midpoint_distance_m": 4645.0,
   "start_elevation_m": 401.8109506056717,
   "end_elevation_m": 399.7940329210549,
   "start_xy": [
    376167.93536131474,
    4916524.937728733
   ],
   "end_xy": [
    376182.7886367875,
    4916538.331018368
   ]
  },
  "min_25m": {
   "gradient_pct": -9.503854274905507,
   "start_distance_m": 4622.0,
   "end_distance_m": 4647.0,
   "midpoint_distance_m": 4634.5,
   "start_elevation_m": 402.9489443597337,
   "end_elevation_m": 400.5729807910073,
   "start_xy": [
    376158.2807253004,
    4916516.232098185
   ],
   "end_xy": [
    376176.8473291261,
    4916532.97369971
   ]
  },
  "min_50m": {
   "gradient_pct": -8.470929060128356,
   "start_distance_m": 4621.0,
   "end_distance_m": 4671.0,
   "midpoint_distance_m": 4646.0,
   "start_elevation_m": 403.0504283006132,
   "end_elevation_m": 398.814963770549,
   "start_xy": [
    376157.53807760315,
    4916515.562415874
   ],
   "end_xy": [
    376194.67126474855,
    4916549.045641667
   ]
  },
  "min_100m": {
   "gradient_pct": -4.87223402055514,
   "start_distance_m": 4622.0,
   "end_distance_m": 4722.0,
   "midpoint_distance_m": 4672.0,
   "start_elevation_m": 402.9489443597337,
   "end_elevation_m": 398.07671033917853,
   "start_xy": [
    376158.2807253004,
    4916516.232098185
   ],
   "end_xy": [
    376232.54741112835,
    4916583.198193337
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.418663735368,
   "start_distance_m": 5199.0,
   "end_distance_m": 5201.0,
   "midpoint_distance_m": 5200.0,
   "start_elevation_m": 422.15951322546755,
   "end_elevation_m": 422.9878865001749,
   "start_xy": [
    376449.81607919233,
    4916999.732819715
   ],
   "end_xy": [
    376451.09319851006,
    4917001.271963719
   ]
  },
  "max_3m": {
   "gradient_pct": 40.19914942819393,
   "start_distance_m": 5199.0,
   "end_distance_m": 5202.0,
   "midpoint_distance_m": 5200.5,
   "start_elevation_m": 422.15951322546755,
   "end_elevation_m": 423.36548770831337,
   "start_xy": [
    376449.81607919233,
    4916999.732819715
   ],
   "end_xy": [
    376451.7312163748,
    4917002.04198528
   ]
  }
 },
 "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": 0.008,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    3496.0,
    3533.0
   ],
   [
    5433.0,
    5438.0
   ]
  ],
  "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/me/USGS_1M_19_x37y492_ME_WesternMtns_B24.tif"
  ],
  "calculated_at": "2026-09-03T22:41:20+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": "canopy-tail-260903",
  "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": [
   "x37y492"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: ME_SouthCoastal_1_2020: no corridor points fetched; NH_Umbagog_2016: no corridor points fetched; USGS_LPC_ME_NRCS_Lot4_2013_LAS_2015: no corridor points fetched; ME_SouthCentral_1_B22: no corridor points fetched",
  "mask_ranges_m": [
   [
    3501.0,
    3528.0
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Woodstock",
  "county": "Maine"
 }
}