{
 "ocl_version": "0.1.0",
 "name": "High Meadow Road",
 "slug": "high-meadow-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.96406371535727,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 170.0,
   "end_distance_m": 172.0,
   "start_elevation_m": 233.29784096200672,
   "end_elevation_m": 233.89712223631386,
   "min_gradient_pct": -97.19036384100832,
   "suppressed_max_gradient_pct": 103.29071876910234,
   "suppressed_location_m": [
    57.0,
    59.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.54929026378265,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 169.0,
   "end_distance_m": 172.0,
   "start_elevation_m": 233.10064352840038,
   "end_elevation_m": 233.89712223631386,
   "min_gradient_pct": -70.81021496829199,
   "suppressed_max_gradient_pct": 79.09986016762976,
   "suppressed_location_m": [
    56.0,
    59.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.980572393138573,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 379.0,
   "end_distance_m": 384.0,
   "start_elevation_m": 266.59906103165594,
   "end_elevation_m": 267.79808965131286,
   "min_gradient_pct": -44.37071139858347,
   "suppressed_max_gradient_pct": 48.65914584569282,
   "suppressed_location_m": [
    54.0,
    59.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.076112798858617,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 375.0,
   "end_distance_m": 385.0,
   "start_elevation_m": 265.7106253128648,
   "end_elevation_m": 268.01823659275067,
   "min_gradient_pct": -20.844400912047547,
   "suppressed_max_gradient_pct": 25.332940289535202,
   "suppressed_location_m": [
    56.0,
    66.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.21948711522515,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 375.0,
   "end_distance_m": 395.0,
   "start_elevation_m": 265.7106253128648,
   "end_elevation_m": 270.15452273590984,
   "min_gradient_pct": -8.121795805615761
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.945126130729705,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 370.0,
   "end_distance_m": 395.0,
   "start_elevation_m": 264.6682412032274,
   "end_elevation_m": 270.15452273590984,
   "min_gradient_pct": -5.950495464985011
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.703591341601623,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 345.0,
   "end_distance_m": 395.0,
   "start_elevation_m": 259.802727065109,
   "end_elevation_m": 270.15452273590984,
   "min_gradient_pct": -5.6738224596929285
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.871773369110144,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 352.0,
   "end_distance_m": 452.0,
   "start_elevation_m": 261.00878902031036,
   "end_elevation_m": 279.8805623894205,
   "min_gradient_pct": 1.3443262658798858
  }
 ],
 "shape": {
  "ascent_concentration": 0.332,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 282.0,
  "shape_class": "sustained"
 },
 "length_m": 606.198330851918,
 "start_elevation_m": 225.06314669190104,
 "end_elevation_m": 308.1966422475322,
 "endpoint_gain_m": 83.13349555563119,
 "overall_gradient_pct": 13.713910336704478,
 "accumulated_ascent_m": 87.00499501038792,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.980572393138573,
   "start_distance_m": 379.0,
   "end_distance_m": 384.0,
   "midpoint_distance_m": 381.5,
   "start_elevation_m": 266.59906103165594,
   "end_elevation_m": 267.79808965131286,
   "start_xy": [
    279141.1001911017,
    4839520.699164583
   ],
   "end_xy": [
    279144.76114911976,
    4839517.350213769
   ]
  },
  "max_10m": {
   "gradient_pct": 23.076112798858617,
   "start_distance_m": 375.0,
   "end_distance_m": 385.0,
   "midpoint_distance_m": 380.0,
   "start_elevation_m": 265.7106253128648,
   "end_elevation_m": 268.01823659275067,
   "start_xy": [
    279138.8769278177,
    4839524.024386437
   ],
   "end_xy": [
    279145.54044960334,
    4839516.723563343
   ]
  },
  "max_20m": {
   "gradient_pct": 22.21948711522515,
   "start_distance_m": 375.0,
   "end_distance_m": 395.0,
   "midpoint_distance_m": 385.0,
   "start_elevation_m": 265.7106253128648,
   "end_elevation_m": 270.15452273590984,
   "start_xy": [
    279138.8769278177,
    4839524.024386437
   ],
   "end_xy": [
    279153.3334544391,
    4839510.4570590835
   ]
  },
  "max_25m": {
   "gradient_pct": 21.945126130729705,
   "start_distance_m": 370.0,
   "end_distance_m": 395.0,
   "midpoint_distance_m": 382.5,
   "start_elevation_m": 264.6682412032274,
   "end_elevation_m": 270.15452273590984,
   "start_xy": [
    279136.09784871264,
    4839528.180913753
   ],
   "end_xy": [
    279153.3334544391,
    4839510.4570590835
   ]
  },
  "max_50m": {
   "gradient_pct": 20.703591341601623,
   "start_distance_m": 345.0,
   "end_distance_m": 395.0,
   "midpoint_distance_m": 370.0,
   "start_elevation_m": 259.802727065109,
   "end_elevation_m": 270.15452273590984,
   "start_xy": [
    279122.20245318755,
    4839548.963550332
   ],
   "end_xy": [
    279153.3334544391,
    4839510.4570590835
   ]
  },
  "max_100m": {
   "gradient_pct": 18.871773369110144,
   "start_distance_m": 352.0,
   "end_distance_m": 452.0,
   "midpoint_distance_m": 402.0,
   "start_elevation_m": 261.00878902031036,
   "end_elevation_m": 279.8805623894205,
   "start_xy": [
    279126.0931639346,
    4839543.14441209
   ],
   "end_xy": [
    279208.68425986683,
    4839502.212358108
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -44.37071139858347,
   "start_distance_m": 49.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 51.5,
   "start_elevation_m": 224.27139902714708,
   "end_elevation_m": 222.0528634572179,
   "start_xy": [
    278888.0958904196,
    4839670.559846675
   ],
   "end_xy": [
    278893.0642267369,
    4839671.121660024
   ]
  },
  "min_10m": {
   "gradient_pct": -20.844400912047547,
   "start_distance_m": 46.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 51.0,
   "start_elevation_m": 224.1972650356784,
   "end_elevation_m": 222.11282494447366,
   "start_xy": [
    278885.1242928152,
    4839670.165658497
   ],
   "end_xy": [
    278895.0515612638,
    4839671.3463853635
   ]
  },
  "min_20m": {
   "gradient_pct": -8.121795805615761,
   "start_distance_m": 36.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 46.0,
   "start_elevation_m": 223.7371841055968,
   "end_elevation_m": 222.11282494447366,
   "start_xy": [
    278875.35210609285,
    4839668.043309171
   ],
   "end_xy": [
    278895.0515612638,
    4839671.3463853635
   ]
  },
  "min_25m": {
   "gradient_pct": -5.950495464985011,
   "start_distance_m": 29.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 41.5,
   "start_elevation_m": 223.54048732346416,
   "end_elevation_m": 222.0528634572179,
   "start_xy": [
    278868.54123678146,
    4839666.436224286
   ],
   "end_xy": [
    278893.0642267369,
    4839671.121660024
   ]
  },
  "min_50m": {
   "gradient_pct": -5.6738224596929285,
   "start_distance_m": 4.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 224.88977468706437,
   "end_elevation_m": 222.0528634572179,
   "start_xy": [
    278844.930311756,
    4839658.314874719
   ],
   "end_xy": [
    278893.0642267369,
    4839671.121660024
   ]
  },
  "min_100m": {
   "gradient_pct": 1.3443262658798858,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 225.06314669190104,
   "end_elevation_m": 226.40747295778093,
   "start_xy": [
    278841.2,
    4839656.871
   ],
   "end_xy": [
    278937.41746497725,
    4839682.482333249
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.96406371535727,
   "start_distance_m": 170.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 171.0,
   "start_elevation_m": 233.29784096200672,
   "end_elevation_m": 233.89712223631386,
   "start_xy": [
    279004.36520567373,
    4839675.247919438
   ],
   "end_xy": [
    279006.1860440699,
    4839674.420545559
   ]
  },
  "max_3m": {
   "gradient_pct": 26.54929026378265,
   "start_distance_m": 169.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 170.5,
   "start_elevation_m": 233.10064352840038,
   "end_elevation_m": 233.89712223631386,
   "start_xy": [
    279003.45478647563,
    4839675.661606378
   ],
   "end_xy": [
    279006.1860440699,
    4839674.420545559
   ]
  }
 },
 "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": 0.021,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    49.0,
    61.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_start",
   "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_x27y484_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:19:54+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": [
   "x27y484"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.6% over 200 m (Terrain 50), gain 83.2 m over 606 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": "Bridgewater",
  "county": "New Hampshire"
 }
}