{
 "ocl_version": "0.1.0",
 "name": "Summer Street",
 "slug": "summer-street-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.0666487640151,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 240.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 355.56097981888473,
   "end_elevation_m": 356.08231279416503,
   "min_gradient_pct": -2.3018337151313517
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.80701418711442,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 239.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 355.3081023685516,
   "end_elevation_m": 356.08231279416503,
   "min_gradient_pct": -1.8613632884883675
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.3111913741202,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 237.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 354.816753225459,
   "end_elevation_m": 356.08231279416503,
   "min_gradient_pct": -0.9081112234366628
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.760677187002216,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 232.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 353.6062450754648,
   "end_elevation_m": 356.08231279416503,
   "min_gradient_pct": 1.3916570024287012
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.950563906887226,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 222.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 351.2922000127876,
   "end_elevation_m": 356.08231279416503,
   "min_gradient_pct": 1.9318478799351624
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.737771430119437,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 221.0,
   "end_distance_m": 246.0,
   "start_elevation_m": 351.056013086856,
   "end_elevation_m": 356.9904559443859,
   "min_gradient_pct": 2.1282766755559805
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.913879992181137,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 201.0,
   "end_distance_m": 251.0,
   "start_elevation_m": 346.74635307395783,
   "end_elevation_m": 357.7032930700484,
   "min_gradient_pct": 2.8208487222855183
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.07382866829238,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 370.0,
   "end_distance_m": 470.0,
   "start_elevation_m": 365.03514681886475,
   "end_elevation_m": 382.1089754871571,
   "min_gradient_pct": 3.5692227350068606
  }
 ],
 "shape": {
  "ascent_concentration": 0.352,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 135.0,
  "shape_class": "sustained"
 },
 "length_m": 685.5025005979055,
 "start_elevation_m": 332.6398166748056,
 "end_elevation_m": 400.0468271637056,
 "endpoint_gain_m": 67.40701048889997,
 "overall_gradient_pct": 9.833226053895729,
 "accumulated_ascent_m": 67.48821655998893,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.3111913741202,
   "start_distance_m": 237.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 239.5,
   "start_elevation_m": 354.816753225459,
   "end_elevation_m": 356.08231279416503,
   "start_xy": [
    327114.64345449785,
    4926931.294184646
   ],
   "end_xy": [
    327114.3597062237,
    4926936.286126845
   ]
  },
  "max_10m": {
   "gradient_pct": 24.760677187002216,
   "start_distance_m": 232.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 237.0,
   "start_elevation_m": 353.6062450754648,
   "end_elevation_m": 356.08231279416503,
   "start_xy": [
    327114.92720277194,
    4926926.302242447
   ],
   "end_xy": [
    327114.3597062237,
    4926936.286126845
   ]
  },
  "max_20m": {
   "gradient_pct": 23.950563906887226,
   "start_distance_m": 222.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 232.0,
   "start_elevation_m": 351.2922000127876,
   "end_elevation_m": 356.08231279416503,
   "start_xy": [
    327115.49469932023,
    4926916.318358049
   ],
   "end_xy": [
    327114.3597062237,
    4926936.286126845
   ]
  },
  "max_25m": {
   "gradient_pct": 23.737771430119437,
   "start_distance_m": 221.0,
   "end_distance_m": 246.0,
   "midpoint_distance_m": 233.5,
   "start_elevation_m": 351.056013086856,
   "end_elevation_m": 356.9904559443859,
   "start_xy": [
    327115.55144897505,
    4926915.319969609
   ],
   "end_xy": [
    327114.1327076044,
    4926940.279680603
   ]
  },
  "max_50m": {
   "gradient_pct": 21.913879992181137,
   "start_distance_m": 201.0,
   "end_distance_m": 251.0,
   "midpoint_distance_m": 226.0,
   "start_elevation_m": 346.74635307395783,
   "end_elevation_m": 357.7032930700484,
   "start_xy": [
    327116.6864420716,
    4926895.352200814
   ],
   "end_xy": [
    327113.84895933024,
    4926945.271622802
   ]
  },
  "max_100m": {
   "gradient_pct": 17.07382866829238,
   "start_distance_m": 370.0,
   "end_distance_m": 470.0,
   "midpoint_distance_m": 420.0,
   "start_elevation_m": 365.03514681886475,
   "end_elevation_m": 382.1089754871571,
   "start_xy": [
    326999.2314045933,
    4926948.898345837
   ],
   "end_xy": [
    326998.0900153535,
    4927048.8895579865
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.9081112234366628,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 332.6398166748056,
   "end_elevation_m": 332.5944111136338,
   "start_xy": [
    327270.376,
    4926888.668
   ],
   "end_xy": [
    327266.33130292594,
    4926891.6074600825
   ]
  },
  "min_10m": {
   "gradient_pct": 1.3916570024287012,
   "start_distance_m": 105.0,
   "end_distance_m": 115.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 343.4765330682136,
   "end_elevation_m": 343.61569876845647,
   "start_xy": [
    327185.48551455326,
    4926949.931171046
   ],
   "end_xy": [
    327179.12881369545,
    4926942.211562622
   ]
  },
  "min_20m": {
   "gradient_pct": 1.9318478799351624,
   "start_distance_m": 105.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 343.4765330682136,
   "end_elevation_m": 343.86290264420063,
   "start_xy": [
    327185.48551455326,
    4926949.931171046
   ],
   "end_xy": [
    327172.77211283764,
    4926934.4919542
   ]
  },
  "min_25m": {
   "gradient_pct": 2.1282766755559805,
   "start_distance_m": 105.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 117.5,
   "start_elevation_m": 343.4765330682136,
   "end_elevation_m": 344.0086022371026,
   "start_xy": [
    327185.48551455326,
    4926949.931171046
   ],
   "end_xy": [
    327169.5937624087,
    4926930.632149988
   ]
  },
  "min_50m": {
   "gradient_pct": 2.8208487222855183,
   "start_distance_m": 105.0,
   "end_distance_m": 155.0,
   "midpoint_distance_m": 130.0,
   "start_elevation_m": 343.4765330682136,
   "end_elevation_m": 344.88695742935636,
   "start_xy": [
    327185.48551455326,
    4926949.931171046
   ],
   "end_xy": [
    327153.70201026415,
    4926911.333128931
   ]
  },
  "min_100m": {
   "gradient_pct": 3.5692227350068606,
   "start_distance_m": 101.0,
   "end_distance_m": 201.0,
   "midpoint_distance_m": 151.0,
   "start_elevation_m": 343.177130338951,
   "end_elevation_m": 346.74635307395783,
   "start_xy": [
    327188.66163521644,
    4926948.029285036
   ],
   "end_xy": [
    327116.6864420716,
    4926895.352200814
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.0666487640151,
   "start_distance_m": 240.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 241.0,
   "start_elevation_m": 355.56097981888473,
   "end_elevation_m": 356.08231279416503,
   "start_xy": [
    327114.47320553334,
    4926934.289349965
   ],
   "end_xy": [
    327114.3597062237,
    4926936.286126845
   ]
  },
  "max_3m": {
   "gradient_pct": 25.80701418711442,
   "start_distance_m": 239.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 240.5,
   "start_elevation_m": 355.3081023685516,
   "end_elevation_m": 356.08231279416503,
   "start_xy": [
    327114.52995518816,
    4926933.290961525
   ],
   "end_xy": [
    327114.3597062237,
    4926936.286126845
   ]
  }
 },
 "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": 0.004,
   "obstruction_max_height_m": 8.06,
   "flagged_windows_m": []
  },
  "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_1M_19_x32y493_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-08-24T20:34:42+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-2-260824",
  "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": [
   "x32y493"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.3% over 200 m (Terrain 50), gain 35.2 m over 319 m way. EXTENDED by graph walk: +4 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. 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": 0.993,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Berlin",
  "county": "New Hampshire"
 }
}