{
 "ocl_version": "0.1.0",
 "name": "Attitash Mt Road",
 "slug": "attitash-mt-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.323451954729762,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 876.0,
   "end_distance_m": 878.0,
   "start_elevation_m": 299.19775610774093,
   "end_elevation_m": 299.7842251468355,
   "min_gradient_pct": -36.04530284362113,
   "suppressed_max_gradient_pct": 40.19412333399828,
   "suppressed_location_m": [
    849.0,
    851.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.944748988860056,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 876.0,
   "end_distance_m": 879.0,
   "start_elevation_m": 299.19775610774093,
   "end_elevation_m": 299.97609857740673,
   "min_gradient_pct": -24.990807520352593,
   "suppressed_max_gradient_pct": 27.583033392653533,
   "suppressed_location_m": [
    848.0,
    851.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.98403210133472,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 57.0,
   "end_distance_m": 62.0,
   "start_elevation_m": 198.3798791110569,
   "end_elevation_m": 199.52908071612364,
   "min_gradient_pct": -15.62840609130376
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.513605792887006,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 53.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 197.49446776758407,
   "end_elevation_m": 199.74582834687277,
   "min_gradient_pct": -5.5822581433744745
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.04079731104642,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 51.0,
   "end_distance_m": 71.0,
   "start_elevation_m": 197.07404701206949,
   "end_elevation_m": 201.48220647427877,
   "min_gradient_pct": 0.9492219778326216
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.67303208836188,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 48.0,
   "end_distance_m": 73.0,
   "start_elevation_m": 196.46896889058752,
   "end_elevation_m": 201.887226912678,
   "min_gradient_pct": 0.9592900597376683
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.020498896565186,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 25.0,
   "end_distance_m": 75.0,
   "start_elevation_m": 192.2709158100896,
   "end_elevation_m": 202.2811652583722,
   "min_gradient_pct": 1.2253223492350571
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.215700140254768,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 14.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 190.65791105151382,
   "end_elevation_m": 208.8736111917686,
   "min_gradient_pct": 2.217477129206145
  }
 ],
 "shape": {
  "ascent_concentration": 0.394,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 441.0,
  "shape_class": "sustained"
 },
 "length_m": 1186.0660792461379,
 "start_elevation_m": 190.43871565834257,
 "end_elevation_m": 317.00021790140556,
 "endpoint_gain_m": 126.56150224306299,
 "overall_gradient_pct": 10.670695710605376,
 "accumulated_ascent_m": 128.13680845486104,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.98403210133472,
   "start_distance_m": 57.0,
   "end_distance_m": 62.0,
   "midpoint_distance_m": 59.5,
   "start_elevation_m": 198.3798791110569,
   "end_elevation_m": 199.52908071612364,
   "start_xy": [
    321687.41272262647,
    4883496.762686231
   ],
   "end_xy": [
    321688.0638953608,
    4883491.805270163
   ]
  },
  "max_10m": {
   "gradient_pct": 22.513605792887006,
   "start_distance_m": 53.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 58.0,
   "start_elevation_m": 197.49446776758407,
   "end_elevation_m": 199.74582834687277,
   "start_xy": [
    321686.8917844389,
    4883500.728619086
   ],
   "end_xy": [
    321688.1941299077,
    4883490.81378695
   ]
  },
  "max_20m": {
   "gradient_pct": 22.04079731104642,
   "start_distance_m": 51.0,
   "end_distance_m": 71.0,
   "midpoint_distance_m": 61.0,
   "start_elevation_m": 197.07404701206949,
   "end_elevation_m": 201.48220647427877,
   "start_xy": [
    321686.6313153452,
    4883502.711585513
   ],
   "end_xy": [
    321688.64950429497,
    4883482.84178847
   ]
  },
  "max_25m": {
   "gradient_pct": 21.67303208836188,
   "start_distance_m": 48.0,
   "end_distance_m": 73.0,
   "midpoint_distance_m": 60.5,
   "start_elevation_m": 196.46896889058752,
   "end_elevation_m": 201.887226912678,
   "start_xy": [
    321686.24061170453,
    4883505.686035153
   ],
   "end_xy": [
    321688.66157650965,
    4883480.841824905
   ]
  },
  "max_50m": {
   "gradient_pct": 20.020498896565186,
   "start_distance_m": 25.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 192.2709158100896,
   "end_elevation_m": 202.2811652583722,
   "start_xy": [
    321682.5032697025,
    4883528.355749808
   ],
   "end_xy": [
    321688.55509108416,
    4883478.86814022
   ]
  },
  "max_100m": {
   "gradient_pct": 18.215700140254768,
   "start_distance_m": 14.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 64.0,
   "start_elevation_m": 190.65791105151382,
   "end_elevation_m": 208.8736111917686,
   "start_xy": [
    321680.0191294756,
    4883539.07158143
   ],
   "end_xy": [
    321674.68347050314,
    4883443.043996343
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.62840609130376,
   "start_distance_m": 852.0,
   "end_distance_m": 857.0,
   "midpoint_distance_m": 854.5,
   "start_elevation_m": 298.2068935480965,
   "end_elevation_m": 297.4254732435313,
   "start_xy": [
    322390.48049134505,
    4883320.721127167
   ],
   "end_xy": [
    322395.4621571199,
    4883320.293335036
   ]
  },
  "min_10m": {
   "gradient_pct": -5.5822581433744745,
   "start_distance_m": 851.0,
   "end_distance_m": 861.0,
   "midpoint_distance_m": 856.0,
   "start_elevation_m": 298.19307013474395,
   "end_elevation_m": 297.6348443204065,
   "start_xy": [
    322389.48415819,
    4883320.806685594
   ],
   "end_xy": [
    322398.9454563452,
    4883320.836088723
   ]
  },
  "min_20m": {
   "gradient_pct": 0.9492219778326216,
   "start_distance_m": 939.0,
   "end_distance_m": 959.0,
   "midpoint_distance_m": 949.0,
   "start_elevation_m": 302.66816445338225,
   "end_elevation_m": 302.85800884894877,
   "start_xy": [
    322457.23599151487,
    4883365.244535144
   ],
   "end_xy": [
    322477.01703213796,
    4883368.195879223
   ]
  },
  "min_25m": {
   "gradient_pct": 0.9592900597376683,
   "start_distance_m": 942.0,
   "end_distance_m": 967.0,
   "midpoint_distance_m": 954.5,
   "start_elevation_m": 302.72432850111363,
   "end_elevation_m": 302.96415101604805,
   "start_xy": [
    322460.2031476083,
    4883365.687236756
   ],
   "end_xy": [
    322484.9294483872,
    4883369.376416855
   ]
  },
  "min_50m": {
   "gradient_pct": 1.2253223492350571,
   "start_distance_m": 937.0,
   "end_distance_m": 987.0,
   "midpoint_distance_m": 962.0,
   "start_elevation_m": 302.631445895099,
   "end_elevation_m": 303.2441070697165,
   "start_xy": [
    322455.2810416869,
    4883364.822602421
   ],
   "end_xy": [
    322504.900950881,
    4883370.376774945
   ]
  },
  "min_100m": {
   "gradient_pct": 2.217477129206145,
   "start_distance_m": 887.0,
   "end_distance_m": 987.0,
   "midpoint_distance_m": 937.0,
   "start_elevation_m": 301.02662994051036,
   "end_elevation_m": 303.2441070697165,
   "start_xy": [
    322410.8486552996,
    4883343.79520797
   ],
   "end_xy": [
    322504.900950881,
    4883370.376774945
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.323451954729762,
   "start_distance_m": 876.0,
   "end_distance_m": 878.0,
   "midpoint_distance_m": 877.0,
   "start_elevation_m": 299.19775610774093,
   "end_elevation_m": 299.7842251468355,
   "start_xy": [
    322405.5119235698,
    4883334.322433972
   ],
   "end_xy": [
    322406.38745253306,
    4883336.120613338
   ]
  },
  "max_3m": {
   "gradient_pct": 25.944748988860056,
   "start_distance_m": 876.0,
   "end_distance_m": 879.0,
   "midpoint_distance_m": 877.5,
   "start_elevation_m": 299.19775610774093,
   "end_elevation_m": 299.97609857740673,
   "start_xy": [
    322405.5119235698,
    4883334.322433972
   ],
   "end_xy": [
    322406.8252170147,
    4883337.019703022
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.157,
   "obstruction_max_height_m": 20.39,
   "flagged_windows_m": [
    2,
    3
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.01,
   "windows_resited": [
    2.0,
    3.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    847.0,
    858.0
   ]
  ],
  "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_1M_19_x32y489_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-08-24T20:23:48+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_Umbagog_LiDAR_2016_D16 (collected 2016)",
  "elevation_tile_ids": [
   "x32y489"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.2% over 200 m (Terrain 50), gain 108.0 m over 860 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): haystack-loop ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Umbagog_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.983,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Bartlett",
  "county": "New Hampshire"
 }
}