{
 "ocl_version": "0.1.0",
 "name": "Frost Mtn Road",
 "slug": "frost-mtn-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.044018638061175,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 806.0,
   "end_distance_m": 808.0,
   "start_elevation_m": 199.5902322357136,
   "end_elevation_m": 200.4111126084748,
   "min_gradient_pct": -11.202685632694909
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.094275973611616,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 805.0,
   "end_distance_m": 808.0,
   "start_elevation_m": 199.17828432926646,
   "end_elevation_m": 200.4111126084748,
   "min_gradient_pct": -9.327869250499058
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.24651263647411,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 804.0,
   "end_distance_m": 809.0,
   "start_elevation_m": 198.7726348782795,
   "end_elevation_m": 200.6849605101032,
   "min_gradient_pct": -8.286594242222804
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 33.92603820909386,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 803.0,
   "end_distance_m": 813.0,
   "start_elevation_m": 198.51893037192303,
   "end_elevation_m": 201.91153419283242,
   "min_gradient_pct": -7.401373021726272
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 30.472905371909604,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 719.0,
   "end_distance_m": 739.0,
   "start_elevation_m": 185.73069879044166,
   "end_elevation_m": 191.82527986482359,
   "min_gradient_pct": -5.723561050373576
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.47944746001724,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 794.0,
   "end_distance_m": 819.0,
   "start_elevation_m": 196.521275193766,
   "end_elevation_m": 203.6411370587703,
   "min_gradient_pct": -5.395877226198309
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.578724773326144,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 689.0,
   "end_distance_m": 739.0,
   "start_elevation_m": 180.0359174781605,
   "end_elevation_m": 191.82527986482359,
   "min_gradient_pct": -1.904566586326382
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.215467026327445,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 636.0,
   "end_distance_m": 736.0,
   "start_elevation_m": 170.8690122257036,
   "end_elevation_m": 191.08447925203106,
   "min_gradient_pct": 1.629064888588175
  }
 ],
 "shape": {
  "ascent_concentration": 0.515,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 184.0,
  "shape_class": "stepped"
 },
 "length_m": 819.3740236461293,
 "start_elevation_m": 134.80380250204854,
 "end_elevation_m": 203.79636177509707,
 "endpoint_gain_m": 68.99255927304853,
 "overall_gradient_pct": 8.420154567024081,
 "accumulated_ascent_m": 72.44409034974686,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.24651263647411,
   "start_distance_m": 804.0,
   "end_distance_m": 809.0,
   "midpoint_distance_m": 806.5,
   "start_elevation_m": 198.7726348782795,
   "end_elevation_m": 200.6849605101032,
   "start_xy": [
    346286.70339863293,
    4867906.468112606
   ],
   "end_xy": [
    346286.81937392196,
    4867911.466767398
   ]
  },
  "max_10m": {
   "gradient_pct": 33.92603820909386,
   "start_distance_m": 803.0,
   "end_distance_m": 813.0,
   "midpoint_distance_m": 808.0,
   "start_elevation_m": 198.51893037192303,
   "end_elevation_m": 201.91153419283242,
   "start_xy": [
    346286.6802035751,
    4867905.468381647
   ],
   "end_xy": [
    346286.9121541531,
    4867915.465691231
   ]
  },
  "max_20m": {
   "gradient_pct": 30.472905371909604,
   "start_distance_m": 719.0,
   "end_distance_m": 739.0,
   "midpoint_distance_m": 729.0,
   "start_elevation_m": 185.73069879044166,
   "end_elevation_m": 191.82527986482359,
   "start_xy": [
    346301.169688891,
    4867823.286358772
   ],
   "end_xy": [
    346296.40050952433,
    4867842.709410235
   ]
  },
  "max_25m": {
   "gradient_pct": 28.47944746001724,
   "start_distance_m": 794.0,
   "end_distance_m": 819.0,
   "midpoint_distance_m": 806.5,
   "start_elevation_m": 196.521275193766,
   "end_elevation_m": 203.6411370587703,
   "start_xy": [
    346286.47144805494,
    4867896.4708030205
   ],
   "end_xy": [
    346287.0513244999,
    4867921.464076982
   ]
  },
  "max_50m": {
   "gradient_pct": 23.578724773326144,
   "start_distance_m": 689.0,
   "end_distance_m": 739.0,
   "midpoint_distance_m": 714.0,
   "start_elevation_m": 180.0359174781605,
   "end_elevation_m": 191.82527986482359,
   "start_xy": [
    346306.52187960496,
    4867793.771942179
   ],
   "end_xy": [
    346296.40050952433,
    4867842.709410235
   ]
  },
  "max_100m": {
   "gradient_pct": 20.215467026327445,
   "start_distance_m": 636.0,
   "end_distance_m": 736.0,
   "midpoint_distance_m": 686.0,
   "start_elevation_m": 170.8690122257036,
   "end_elevation_m": 191.08447925203106,
   "start_xy": [
    346315.7396269999,
    4867741.579671362
   ],
   "end_xy": [
    346297.1158864293,
    4867839.795952516
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.286594242222804,
   "start_distance_m": 436.0,
   "end_distance_m": 441.0,
   "midpoint_distance_m": 438.5,
   "start_elevation_m": 154.8301191876977,
   "end_elevation_m": 154.41578947558656,
   "start_xy": [
    346328.1994635676,
    4867557.391957343
   ],
   "end_xy": [
    346332.7136248998,
    4867559.54192187
   ]
  },
  "min_10m": {
   "gradient_pct": -7.401373021726272,
   "start_distance_m": 431.0,
   "end_distance_m": 441.0,
   "midpoint_distance_m": 436.0,
   "start_elevation_m": 155.1559267777592,
   "end_elevation_m": 154.41578947558656,
   "start_xy": [
    346323.68530223536,
    4867555.241992816
   ],
   "end_xy": [
    346332.7136248998,
    4867559.54192187
   ]
  },
  "min_20m": {
   "gradient_pct": -5.723561050373576,
   "start_distance_m": 431.0,
   "end_distance_m": 451.0,
   "midpoint_distance_m": 441.0,
   "start_elevation_m": 155.1559267777592,
   "end_elevation_m": 154.01121456768448,
   "start_xy": [
    346323.68530223536,
    4867555.241992816
   ],
   "end_xy": [
    346340.22708972014,
    4867565.562111769
   ]
  },
  "min_25m": {
   "gradient_pct": -5.395877226198309,
   "start_distance_m": 428.0,
   "end_distance_m": 453.0,
   "midpoint_distance_m": 440.5,
   "start_elevation_m": 155.31768135182296,
   "end_elevation_m": 153.96871204527338,
   "start_xy": [
    346320.976805436,
    4867553.9520141
   ],
   "end_xy": [
    346341.3085384584,
    4867567.244511432
   ]
  },
  "min_50m": {
   "gradient_pct": -1.904566586326382,
   "start_distance_m": 422.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 447.0,
   "start_elevation_m": 155.10324357845064,
   "end_elevation_m": 154.15096028528745,
   "start_xy": [
    346320.6984965351,
    4867548.043746675
   ],
   "end_xy": [
    346351.14651490067,
    4867583.360795195
   ]
  },
  "min_100m": {
   "gradient_pct": 1.629064888588175,
   "start_distance_m": 385.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 435.0,
   "start_elevation_m": 153.329588438844,
   "end_elevation_m": 154.9586533274322,
   "start_xy": [
    346319.8402667614,
    4867511.053701506
   ],
   "end_xy": [
    346351.4478061967,
    4867596.357303324
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.044018638061175,
   "start_distance_m": 806.0,
   "end_distance_m": 808.0,
   "midpoint_distance_m": 807.0,
   "start_elevation_m": 199.5902322357136,
   "end_elevation_m": 200.4111126084748,
   "start_xy": [
    346286.7497887485,
    4867908.467574522
   ],
   "end_xy": [
    346286.79617886414,
    4867910.467036439
   ]
  },
  "max_3m": {
   "gradient_pct": 41.094275973611616,
   "start_distance_m": 805.0,
   "end_distance_m": 808.0,
   "midpoint_distance_m": 806.5,
   "start_elevation_m": 199.17828432926646,
   "end_elevation_m": 200.4111126084748,
   "start_xy": [
    346286.72659369075,
    4867907.467843564
   ],
   "end_xy": [
    346286.79617886414,
    4867910.467036439
   ]
  }
 },
 "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_x34y487_ME_SouthCentral_B22.tif"
  ],
  "calculated_at": "2026-08-24T20:37:37+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_SouthCentral_B22 (collected 2022)",
  "elevation_tile_ids": [
   "x34y487"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.8% over 200 m (Terrain 50), gain 68.9 m over 819 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": "Brownfield",
  "county": "Maine"
 }
}