{
 "ocl_version": "0.1.0",
 "name": "Ansley Road",
 "slug": "ansley-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 56.797679740469675,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 278.02936293106586,
   "end_elevation_m": 279.16531652587526,
   "min_gradient_pct": -5.80663255816205
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 49.951630923970924,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 312.0,
   "end_distance_m": 315.0,
   "start_elevation_m": 278.02936293106586,
   "end_elevation_m": 279.527911858785,
   "min_gradient_pct": -3.7412236815346964
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.00885662227461,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 311.0,
   "end_distance_m": 316.0,
   "start_elevation_m": 277.8975668885022,
   "end_elevation_m": 279.6480097196159,
   "min_gradient_pct": -0.8332398904906313
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.49935159403094,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 366.0,
   "end_distance_m": 376.0,
   "start_elevation_m": 284.79938245653847,
   "end_elevation_m": 287.54931761594156,
   "min_gradient_pct": -0.19597094135974658
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.05885109819451,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 355.0,
   "end_distance_m": 375.0,
   "start_elevation_m": 282.49816768115693,
   "end_elevation_m": 287.30993790079583,
   "min_gradient_pct": -0.0015806720071509517
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.75987499410303,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 354.0,
   "end_distance_m": 379.0,
   "start_elevation_m": 282.38294319101385,
   "end_elevation_m": 288.0729119395396,
   "min_gradient_pct": 0.13174922797315958
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.901631881096478,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 354.0,
   "end_distance_m": 404.0,
   "start_elevation_m": 282.38294319101385,
   "end_elevation_m": 291.3337591315621,
   "min_gradient_pct": 0.3910353359988221
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.080675186649728,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 311.0,
   "end_distance_m": 411.0,
   "start_elevation_m": 277.8975668885022,
   "end_elevation_m": 291.9782420751519,
   "min_gradient_pct": 0.720471087457554
  }
 ],
 "shape": {
  "ascent_concentration": 0.557,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 58.0,
  "shape_class": "stepped"
 },
 "length_m": 442.1125669199291,
 "start_elevation_m": 268.9262912485186,
 "end_elevation_m": 295.063768130847,
 "endpoint_gain_m": 26.13747688232837,
 "overall_gradient_pct": 5.9119506745579855,
 "accumulated_ascent_m": 27.304400621342722,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.00885662227461,
   "start_distance_m": 311.0,
   "end_distance_m": 316.0,
   "midpoint_distance_m": 313.5,
   "start_elevation_m": 277.8975668885022,
   "end_elevation_m": 279.6480097196159,
   "start_xy": [
    257237.57149056986,
    4877460.031393605
   ],
   "end_xy": [
    257233.11128316965,
    4877457.826507953
   ]
  },
  "max_10m": {
   "gradient_pct": 27.49935159403094,
   "start_distance_m": 366.0,
   "end_distance_m": 376.0,
   "midpoint_distance_m": 371.0,
   "start_elevation_m": 284.79938245653847,
   "end_elevation_m": 287.54931761594156,
   "start_xy": [
    257187.80867855172,
    4877436.668199541
   ],
   "end_xy": [
    257178.74815762814,
    4877432.436537859
   ]
  },
  "max_20m": {
   "gradient_pct": 24.05885109819451,
   "start_distance_m": 355.0,
   "end_distance_m": 375.0,
   "midpoint_distance_m": 365.0,
   "start_elevation_m": 282.49816768115693,
   "end_elevation_m": 287.30993790079583,
   "start_xy": [
    257197.77525156765,
    4877441.323027392
   ],
   "end_xy": [
    257179.6542097205,
    4877432.859704027
   ]
  },
  "max_25m": {
   "gradient_pct": 22.75987499410303,
   "start_distance_m": 354.0,
   "end_distance_m": 379.0,
   "midpoint_distance_m": 366.5,
   "start_elevation_m": 282.38294319101385,
   "end_elevation_m": 288.0729119395396,
   "start_xy": [
    257198.68130366,
    4877441.74619356
   ],
   "end_xy": [
    257176.03000135106,
    4877431.167039354
   ]
  },
  "max_50m": {
   "gradient_pct": 17.901631881096478,
   "start_distance_m": 354.0,
   "end_distance_m": 404.0,
   "midpoint_distance_m": 379.0,
   "start_elevation_m": 282.38294319101385,
   "end_elevation_m": 291.3337591315621,
   "start_xy": [
    257198.68130366,
    4877441.74619356
   ],
   "end_xy": [
    257153.37869904208,
    4877420.587885149
   ]
  },
  "max_100m": {
   "gradient_pct": 14.080675186649728,
   "start_distance_m": 311.0,
   "end_distance_m": 411.0,
   "midpoint_distance_m": 361.0,
   "start_elevation_m": 277.8975668885022,
   "end_elevation_m": 291.9782420751519,
   "start_xy": [
    257237.57149056986,
    4877460.031393605
   ],
   "end_xy": [
    257147.03633439558,
    4877417.625721971
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.8332398904906313,
   "start_distance_m": 26.0,
   "end_distance_m": 31.0,
   "midpoint_distance_m": 28.5,
   "start_elevation_m": 269.83920675159357,
   "end_elevation_m": 269.79754475706903,
   "start_xy": [
    257342.76405412258,
    4877724.300452406
   ],
   "end_xy": [
    257340.46021837692,
    4877719.862847099
   ]
  },
  "min_10m": {
   "gradient_pct": -0.19597094135974658,
   "start_distance_m": 33.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 38.0,
   "start_elevation_m": 269.8612142527779,
   "end_elevation_m": 269.84161715864195,
   "start_xy": [
    257339.53868407867,
    4877718.087804977
   ],
   "end_xy": [
    257335.77660463733,
    4877708.829466995
   ]
  },
  "min_20m": {
   "gradient_pct": -0.0015806720071509517,
   "start_distance_m": 35.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 45.0,
   "start_elevation_m": 269.8711469672509,
   "end_elevation_m": 269.8708308328495,
   "start_xy": [
    257338.68427577033,
    4877716.282348893
   ],
   "end_xy": [
    257331.4150979378,
    4877697.650144149
   ]
  },
  "min_25m": {
   "gradient_pct": 0.13174922797315958,
   "start_distance_m": 25.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 37.5,
   "start_elevation_m": 269.82378821677014,
   "end_elevation_m": 269.85672552376343,
   "start_xy": [
    257343.22482127172,
    4877725.187973468
   ],
   "end_xy": [
    257333.23239239593,
    4877702.308195335
   ]
  },
  "min_50m": {
   "gradient_pct": 0.3910353359988221,
   "start_distance_m": 24.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 49.0,
   "start_elevation_m": 269.83016109031803,
   "end_elevation_m": 270.02567875831744,
   "start_xy": [
    257343.68558842083,
    4877726.075494529
   ],
   "end_xy": [
    257324.5093789969,
    4877679.949549641
   ]
  },
  "min_100m": {
   "gradient_pct": 0.720471087457554,
   "start_distance_m": 24.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 74.0,
   "start_elevation_m": 269.83016109031803,
   "end_elevation_m": 270.5506321777756,
   "start_xy": [
    257343.68558842083,
    4877726.075494529
   ],
   "end_xy": [
    257306.41968802773,
    4877633.337533248
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 56.797679740469675,
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 278.02936293106586,
   "end_elevation_m": 279.16531652587526,
   "start_xy": [
    257236.7354915391,
    4877459.519172626
   ],
   "end_xy": [
    257234.92338735436,
    4877458.672840289
   ]
  },
  "max_3m": {
   "gradient_pct": 49.951630923970924,
   "start_distance_m": 312.0,
   "end_distance_m": 315.0,
   "midpoint_distance_m": 313.5,
   "start_elevation_m": 278.02936293106586,
   "end_elevation_m": 279.527911858785,
   "start_xy": [
    257236.7354915391,
    4877459.519172626
   ],
   "end_xy": [
    257234.017335262,
    4877458.249674121
   ]
  }
 },
 "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/nh/USGS_one_meter_x25y488_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:24:44+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-6-260824",
  "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": [
   "x25y488"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.2% over 200 m (Terrain 50), gain 26.0 m over 442 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": "Haverhill",
  "county": "New Hampshire"
 }
}