{
 "ocl_version": "0.1.0",
 "name": "Stevens Drive",
 "slug": "stevens-drive",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.817100564757766,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 52.0,
   "end_distance_m": 54.0,
   "start_elevation_m": 348.6111135747956,
   "end_elevation_m": 349.10745558609074,
   "min_gradient_pct": -0.07028753284998857
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.85371230698661,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 52.0,
   "end_distance_m": 55.0,
   "start_elevation_m": 348.6111135747956,
   "end_elevation_m": 349.3567249440052,
   "min_gradient_pct": 2.369145424607192
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.109514808384347,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 51.0,
   "end_distance_m": 56.0,
   "start_elevation_m": 348.3834630465506,
   "end_elevation_m": 349.58893878696983,
   "min_gradient_pct": 4.979529008113559
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.622103492868405,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 48.0,
   "end_distance_m": 58.0,
   "start_elevation_m": 347.68515338590544,
   "end_elevation_m": 350.0473637351923,
   "min_gradient_pct": 9.306272005199503
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.734999242522917,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 39.0,
   "end_distance_m": 59.0,
   "start_elevation_m": 345.727963996948,
   "end_elevation_m": 350.2749638454526,
   "min_gradient_pct": 10.102592836121289
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.188541571259293,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 36.0,
   "end_distance_m": 61.0,
   "start_elevation_m": 345.15963796154125,
   "end_elevation_m": 350.7067733543561,
   "min_gradient_pct": 10.226260521362292
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.80299592502172,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 341.17468918147466,
   "end_elevation_m": 351.0761871439855,
   "min_gradient_pct": 11.796905922278484
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.6754950938859,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 340.25844157639153,
   "end_elevation_m": 356.93393667027743,
   "min_gradient_pct": 14.306822531288674
  }
 ],
 "shape": {
  "ascent_concentration": 0.369,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 117.0,
  "shape_class": "sustained"
 },
 "length_m": 141.44802601446355,
 "start_elevation_m": 339.79006630665117,
 "end_elevation_m": 360.5173479423869,
 "endpoint_gain_m": 20.72728163573572,
 "overall_gradient_pct": 14.653637961420745,
 "accumulated_ascent_m": 20.74902780481807,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.109514808384347,
   "start_distance_m": 51.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 53.5,
   "start_elevation_m": 348.3834630465506,
   "end_elevation_m": 349.58893878696983,
   "start_xy": [
    278028.09245353757,
    4842802.091371173
   ],
   "end_xy": [
    278033.0157754145,
    4842801.21907438
   ]
  },
  "max_10m": {
   "gradient_pct": 23.622103492868405,
   "start_distance_m": 48.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 53.0,
   "start_elevation_m": 347.68515338590544,
   "end_elevation_m": 350.0473637351923,
   "start_xy": [
    278025.11630214204,
    4842802.375110958
   ],
   "end_xy": [
    278034.9851041653,
    4842800.870155661
   ]
  },
  "max_20m": {
   "gradient_pct": 22.734999242522917,
   "start_distance_m": 39.0,
   "end_distance_m": 59.0,
   "midpoint_distance_m": 49.0,
   "start_elevation_m": 345.727963996948,
   "end_elevation_m": 350.2749638454526,
   "start_xy": [
    278016.1166706943,
    4842802.456559131
   ],
   "end_xy": [
    278035.8740338965,
    4842800.420376835
   ]
  },
  "max_25m": {
   "gradient_pct": 22.188541571259293,
   "start_distance_m": 36.0,
   "end_distance_m": 61.0,
   "midpoint_distance_m": 48.5,
   "start_elevation_m": 345.15963796154125,
   "end_elevation_m": 350.7067733543561,
   "start_xy": [
    278013.1167935451,
    4842802.483708521
   ],
   "end_xy": [
    278037.6349856107,
    4842799.472194859
   ]
  },
  "max_50m": {
   "gradient_pct": 19.80299592502172,
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 38.0,
   "start_elevation_m": 341.17468918147466,
   "end_elevation_m": 351.0761871439855,
   "start_xy": [
    277990.7108392747,
    4842806.072079488
   ],
   "end_xy": [
    278039.395937325,
    4842798.524012882
   ]
  },
  "max_100m": {
   "gradient_pct": 16.6754950938859,
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 57.0,
   "start_elevation_m": 340.25844157639153,
   "end_elevation_m": 356.93393667027743,
   "start_xy": [
    277985.6865716549,
    4842809.313621142
   ],
   "end_xy": [
    278060.71087924397,
    4842760.485783629
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 4.979529008113559,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 339.79006630665117,
   "end_elevation_m": 340.03904275705685,
   "start_xy": [
    277979.976,
    4842813.362
   ],
   "end_xy": [
    277984.05497975356,
    4842810.470300816
   ]
  },
  "min_10m": {
   "gradient_pct": 9.306272005199503,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 339.79006630665117,
   "end_elevation_m": 340.7206935071711,
   "start_xy": [
    277979.976,
    4842813.362
   ],
   "end_xy": [
    277988.13395950705,
    4842807.578601632
   ]
  },
  "min_20m": {
   "gradient_pct": 10.102592836121289,
   "start_distance_m": 107.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 117.0,
   "start_elevation_m": 356.93393667027743,
   "end_elevation_m": 358.9544552375017,
   "start_xy": [
    278060.71087924397,
    4842760.485783629
   ],
   "end_xy": [
    278067.2602919346,
    4842741.588556494
   ]
  },
  "min_25m": {
   "gradient_pct": 10.226260521362292,
   "start_distance_m": 107.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 119.5,
   "start_elevation_m": 356.93393667027743,
   "end_elevation_m": 359.490501800618,
   "start_xy": [
    278060.71087924397,
    4842760.485783629
   ],
   "end_xy": [
    278068.89764510724,
    4842736.86424971
   ]
  },
  "min_50m": {
   "gradient_pct": 11.796905922278484,
   "start_distance_m": 91.0,
   "end_distance_m": 141.0,
   "midpoint_distance_m": 116.0,
   "start_elevation_m": 354.594322114959,
   "end_elevation_m": 360.49277507609827,
   "start_xy": [
    278054.05020078627,
    4842774.989988196
   ],
   "end_xy": [
    278071.47286749224,
    4842728.242486272
   ]
  },
  "min_100m": {
   "gradient_pct": 14.306822531288674,
   "start_distance_m": 41.0,
   "end_distance_m": 141.0,
   "midpoint_distance_m": 91.0,
   "start_elevation_m": 346.1859525448096,
   "end_elevation_m": 360.49277507609827,
   "start_xy": [
    278018.1165887938,
    4842802.438459537
   ],
   "end_xy": [
    278071.47286749224,
    4842728.242486272
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.817100564757766,
   "start_distance_m": 52.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 53.0,
   "start_elevation_m": 348.6111135747956,
   "end_elevation_m": 349.10745558609074,
   "start_xy": [
    278029.07711791294,
    4842801.916911814
   ],
   "end_xy": [
    278031.04644666373,
    4842801.567993097
   ]
  },
  "max_3m": {
   "gradient_pct": 24.85371230698661,
   "start_distance_m": 52.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 53.5,
   "start_elevation_m": 348.6111135747956,
   "end_elevation_m": 349.3567249440052,
   "start_xy": [
    278029.07711791294,
    4842801.916911814
   ],
   "end_xy": [
    278032.0311110391,
    4842801.393533738
   ]
  }
 },
 "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/nh/USGS_one_meter_x27y485_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:37:43+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-nh-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, NH_CT_RiverNorthL6_2015 (collected 2015)",
  "elevation_tile_ids": [
   "x27y485"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.7% over 200 m (Terrain 50), gain 20.8 m over 141 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": "Hebron",
  "county": "New Hampshire"
 }
}