{
 "ocl_version": "0.1.0",
 "name": "Phyllis Lane",
 "slug": "phyllis-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 38.70722524377186,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 160.0,
   "end_distance_m": 162.0,
   "start_elevation_m": 414.9787133842292,
   "end_elevation_m": 415.75285788910463,
   "min_gradient_pct": -16.22129807036856
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.840257149510535,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 159.0,
   "end_distance_m": 162.0,
   "start_elevation_m": 414.6776501746193,
   "end_elevation_m": 415.75285788910463,
   "min_gradient_pct": -12.899105019937451
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 32.70341824425145,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 159.0,
   "end_distance_m": 164.0,
   "start_elevation_m": 414.6776501746193,
   "end_elevation_m": 416.3128210868319,
   "min_gradient_pct": -9.82478160349956
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.841592398929606,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 157.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 414.14839228357016,
   "end_elevation_m": 417.1325515234631,
   "min_gradient_pct": -6.7599987884364054
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.719189679017802,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 147.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 411.98871358765956,
   "end_elevation_m": 417.1325515234631,
   "min_gradient_pct": -4.850495414305271
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.441516341766373,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 144.0,
   "end_distance_m": 169.0,
   "start_elevation_m": 411.51866682703564,
   "end_elevation_m": 417.62904591247724,
   "min_gradient_pct": -4.23587709707931
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.411758777095542,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 135.0,
   "end_distance_m": 185.0,
   "start_elevation_m": 409.62459192736964,
   "end_elevation_m": 420.3304713159174,
   "min_gradient_pct": 3.007197946209544
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.502644561731866,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 240.0,
   "start_elevation_m": 410.7043985531125,
   "end_elevation_m": 431.2070431148444,
   "min_gradient_pct": 3.659513019407143
  }
 ],
 "shape": {
  "ascent_concentration": 0.377,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 187.0,
  "shape_class": "sustained"
 },
 "length_m": 285.25597516090795,
 "start_elevation_m": 401.18178470871067,
 "end_elevation_m": 438.5104897787375,
 "endpoint_gain_m": 37.32870507002684,
 "overall_gradient_pct": 13.086037916986793,
 "accumulated_ascent_m": 39.253359939309576,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 32.70341824425145,
   "start_distance_m": 159.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 161.5,
   "start_elevation_m": 414.6776501746193,
   "end_elevation_m": 416.3128210868319,
   "start_xy": [
    248270.74896108237,
    4775097.130563731
   ],
   "end_xy": [
    248275.74528061325,
    4775097.322373911
   ]
  },
  "max_10m": {
   "gradient_pct": 29.841592398929606,
   "start_distance_m": 157.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 162.0,
   "start_elevation_m": 414.14839228357016,
   "end_elevation_m": 417.1325515234631,
   "start_xy": [
    248268.75043327,
    4775097.053839658
   ],
   "end_xy": [
    248278.7430723318,
    4775097.437460019
   ]
  },
  "max_20m": {
   "gradient_pct": 25.719189679017802,
   "start_distance_m": 147.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 157.0,
   "start_elevation_m": 411.98871358765956,
   "end_elevation_m": 417.1325515234631,
   "start_xy": [
    248258.7577942082,
    4775096.670219298
   ],
   "end_xy": [
    248278.7430723318,
    4775097.437460019
   ]
  },
  "max_25m": {
   "gradient_pct": 24.441516341766373,
   "start_distance_m": 144.0,
   "end_distance_m": 169.0,
   "midpoint_distance_m": 156.5,
   "start_elevation_m": 411.51866682703564,
   "end_elevation_m": 417.62904591247724,
   "start_xy": [
    248255.7600024897,
    4775096.55513319
   ],
   "end_xy": [
    248280.74160014416,
    4775097.514184091
   ]
  },
  "max_50m": {
   "gradient_pct": 21.411758777095542,
   "start_distance_m": 135.0,
   "end_distance_m": 185.0,
   "midpoint_distance_m": 160.0,
   "start_elevation_m": 409.62459192736964,
   "end_elevation_m": 420.3304713159174,
   "start_xy": [
    248246.7666273341,
    4775096.209874866
   ],
   "end_xy": [
    248296.729822643,
    4775098.127976668
   ]
  },
  "max_100m": {
   "gradient_pct": 20.502644561731866,
   "start_distance_m": 140.0,
   "end_distance_m": 240.0,
   "midpoint_distance_m": 190.0,
   "start_elevation_m": 410.7043985531125,
   "end_elevation_m": 431.2070431148444,
   "start_xy": [
    248251.76294686497,
    4775096.401685046
   ],
   "end_xy": [
    248351.68933748282,
    4775100.23788865
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.82478160349956,
   "start_distance_m": 17.0,
   "end_distance_m": 22.0,
   "midpoint_distance_m": 19.5,
   "start_elevation_m": 400.64351094718063,
   "end_elevation_m": 400.15227186700565,
   "start_xy": [
    248128.85348640505,
    4775091.683154613
   ],
   "end_xy": [
    248133.84980593593,
    4775091.874964793
   ]
  },
  "min_10m": {
   "gradient_pct": -6.7599987884364054,
   "start_distance_m": 11.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 16.0,
   "start_elevation_m": 400.8809433884255,
   "end_elevation_m": 400.2049435095819,
   "start_xy": [
    248122.85790296798,
    4775091.452982397
   ],
   "end_xy": [
    248132.85054202974,
    4775091.836602758
   ]
  },
  "min_20m": {
   "gradient_pct": -4.850495414305271,
   "start_distance_m": 1.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 11.0,
   "start_elevation_m": 401.17504259244294,
   "end_elevation_m": 400.2049435095819,
   "start_xy": [
    248112.8652639062,
    4775091.069362037
   ],
   "end_xy": [
    248132.85054202974,
    4775091.836602758
   ]
  },
  "min_25m": {
   "gradient_pct": -4.23587709707931,
   "start_distance_m": 1.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 13.5,
   "start_elevation_m": 401.17504259244294,
   "end_elevation_m": 400.1160733181731,
   "start_xy": [
    248112.8652639062,
    4775091.069362037
   ],
   "end_xy": [
    248137.84686156065,
    4775092.028412937
   ]
  },
  "min_50m": {
   "gradient_pct": 3.007197946209544,
   "start_distance_m": 48.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 73.0,
   "start_elevation_m": 403.2301784244212,
   "end_elevation_m": 404.73377739752596,
   "start_xy": [
    248159.83066749657,
    4775092.87237773
   ],
   "end_xy": [
    248209.7938628055,
    4775094.790479532
   ]
  },
  "min_100m": {
   "gradient_pct": 3.659513019407143,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 401.18178470871067,
   "end_elevation_m": 404.8412977281178,
   "start_xy": [
    248111.866,
    4775091.031
   ],
   "end_xy": [
    248211.79239061783,
    4775094.867203604
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 38.70722524377186,
   "start_distance_m": 160.0,
   "end_distance_m": 162.0,
   "midpoint_distance_m": 161.0,
   "start_elevation_m": 414.9787133842292,
   "end_elevation_m": 415.75285788910463,
   "start_xy": [
    248271.74822498855,
    4775097.168925767
   ],
   "end_xy": [
    248273.74675280091,
    4775097.245649839
   ]
  },
  "max_3m": {
   "gradient_pct": 35.840257149510535,
   "start_distance_m": 159.0,
   "end_distance_m": 162.0,
   "midpoint_distance_m": 160.5,
   "start_elevation_m": 414.6776501746193,
   "end_elevation_m": 415.75285788910463,
   "start_xy": [
    248270.74896108237,
    4775097.130563731
   ],
   "end_xy": [
    248273.74675280091,
    4775097.245649839
   ]
  }
 },
 "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": [
   "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_x24y478_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:23:04+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": [
   "x24y478"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.3% over 200 m (Terrain 50), gain 38.1 m over 285 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": "Stoddard",
  "county": "New Hampshire"
 }
}