{
 "ocl_version": "0.1.0",
 "name": "Sentry Hill Lane",
 "slug": "sentry-hill-lane",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.083338756567514,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 242.0,
   "end_distance_m": 244.0,
   "start_elevation_m": 224.0998496766715,
   "end_elevation_m": 224.98151645180286,
   "min_gradient_pct": -8.30406183770691
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.4710016346609,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 242.0,
   "end_distance_m": 245.0,
   "start_elevation_m": 224.0998496766715,
   "end_elevation_m": 225.40397972571134,
   "min_gradient_pct": -7.261761698493767
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 42.031072141759864,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 240.0,
   "end_distance_m": 245.0,
   "start_elevation_m": 223.30242611862334,
   "end_elevation_m": 225.40397972571134,
   "min_gradient_pct": -5.060716180508393
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 40.68108362891394,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 239.0,
   "end_distance_m": 249.0,
   "start_elevation_m": 222.93900571053337,
   "end_elevation_m": 227.00711407342476,
   "min_gradient_pct": -1.619378666113107
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 35.805623688400345,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 233.0,
   "end_distance_m": 253.0,
   "start_elevation_m": 220.95732380956974,
   "end_elevation_m": 228.1184485472498,
   "min_gradient_pct": 2.906092943455434
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 33.18248153618913,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 228.0,
   "end_distance_m": 253.0,
   "start_elevation_m": 219.82282816320253,
   "end_elevation_m": 228.1184485472498,
   "min_gradient_pct": 4.055255144029047
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.292554364435947,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 203.0,
   "end_distance_m": 253.0,
   "start_elevation_m": 216.97217136503184,
   "end_elevation_m": 228.1184485472498,
   "min_gradient_pct": 5.292100533477367
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.58935011648728,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 53.0,
   "end_distance_m": 153.0,
   "start_elevation_m": 199.73677098180588,
   "end_elevation_m": 214.32612109829316,
   "min_gradient_pct": 9.026435834603916
  }
 ],
 "shape": {
  "ascent_concentration": 0.364,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 80.0,
  "shape_class": "sustained"
 },
 "length_m": 253.29943685069946,
 "start_elevation_m": 195.76319016914044,
 "end_elevation_m": 228.22343030878915,
 "endpoint_gain_m": 32.460240139648704,
 "overall_gradient_pct": 12.814967353749594,
 "accumulated_ascent_m": 32.87152944566816,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 42.031072141759864,
   "start_distance_m": 240.0,
   "end_distance_m": 245.0,
   "midpoint_distance_m": 242.5,
   "start_elevation_m": 223.30242611862334,
   "end_elevation_m": 225.40397972571134,
   "start_xy": [
    634277.949650025,
    4615022.017152696
   ],
   "end_xy": [
    634282.7793094005,
    4615023.311135043
   ]
  },
  "max_10m": {
   "gradient_pct": 40.68108362891394,
   "start_distance_m": 239.0,
   "end_distance_m": 249.0,
   "midpoint_distance_m": 244.0,
   "start_elevation_m": 222.93900571053337,
   "end_elevation_m": 227.00711407342476,
   "start_xy": [
    634276.9837181498,
    4615021.758356226
   ],
   "end_xy": [
    634286.6430369009,
    4615024.346320922
   ]
  },
  "max_20m": {
   "gradient_pct": 35.805623688400345,
   "start_distance_m": 233.0,
   "end_distance_m": 253.0,
   "midpoint_distance_m": 243.0,
   "start_elevation_m": 220.95732380956974,
   "end_elevation_m": 228.1184485472498,
   "start_xy": [
    634271.1881268992,
    4615020.205577409
   ],
   "end_xy": [
    634290.5067644013,
    4615025.3815068
   ]
  },
  "max_25m": {
   "gradient_pct": 33.18248153618913,
   "start_distance_m": 228.0,
   "end_distance_m": 253.0,
   "midpoint_distance_m": 240.5,
   "start_elevation_m": 219.82282816320253,
   "end_elevation_m": 228.1184485472498,
   "start_xy": [
    634266.3584675237,
    4615018.9115950605
   ],
   "end_xy": [
    634290.5067644013,
    4615025.3815068
   ]
  },
  "max_50m": {
   "gradient_pct": 22.292554364435947,
   "start_distance_m": 203.0,
   "end_distance_m": 253.0,
   "midpoint_distance_m": 228.0,
   "start_elevation_m": 216.97217136503184,
   "end_elevation_m": 228.1184485472498,
   "start_xy": [
    634242.2101706461,
    4615012.441683322
   ],
   "end_xy": [
    634290.5067644013,
    4615025.3815068
   ]
  },
  "max_100m": {
   "gradient_pct": 14.58935011648728,
   "start_distance_m": 53.0,
   "end_distance_m": 153.0,
   "midpoint_distance_m": 103.0,
   "start_elevation_m": 199.73677098180588,
   "end_elevation_m": 214.32612109829316,
   "start_xy": [
    634097.3203893806,
    4614973.622212888
   ],
   "end_xy": [
    634193.913576891,
    4614999.501859844
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.060716180508393,
   "start_distance_m": 5.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 7.5,
   "start_elevation_m": 195.85428811155455,
   "end_elevation_m": 195.60125230252913,
   "start_xy": [
    634050.9556593755,
    4614961.199982348
   ],
   "end_xy": [
    634055.7853187511,
    4614962.493964696
   ]
  },
  "min_10m": {
   "gradient_pct": -1.619378666113107,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 195.76319016914044,
   "end_elevation_m": 195.60125230252913,
   "start_xy": [
    634046.126,
    4614959.906
   ],
   "end_xy": [
    634055.7853187511,
    4614962.493964696
   ]
  },
  "min_20m": {
   "gradient_pct": 2.906092943455434,
   "start_distance_m": 16.0,
   "end_distance_m": 36.0,
   "midpoint_distance_m": 26.0,
   "start_elevation_m": 197.4021874516013,
   "end_elevation_m": 197.98340604029238,
   "start_xy": [
    634061.5809100018,
    4614964.046743513
   ],
   "end_xy": [
    634080.8995475038,
    4614969.222672905
   ]
  },
  "min_25m": {
   "gradient_pct": 4.055255144029047,
   "start_distance_m": 177.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 189.5,
   "start_elevation_m": 215.86192884964157,
   "end_elevation_m": 216.87574263564883,
   "start_xy": [
    634217.0959418934,
    4615005.712975113
   ],
   "end_xy": [
    634241.244238771,
    4615012.182886852
   ]
  },
  "min_50m": {
   "gradient_pct": 5.292100533477367,
   "start_distance_m": 153.0,
   "end_distance_m": 203.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 214.32612109829316,
   "end_elevation_m": 216.97217136503184,
   "start_xy": [
    634193.913576891,
    4614999.501859844
   ],
   "end_xy": [
    634242.2101706461,
    4615012.441683322
   ]
  },
  "min_100m": {
   "gradient_pct": 9.026435834603916,
   "start_distance_m": 120.0,
   "end_distance_m": 220.0,
   "midpoint_distance_m": 170.0,
   "start_elevation_m": 209.59426665870785,
   "end_elevation_m": 218.62070249331177,
   "start_xy": [
    634162.0378250125,
    4614990.961576348
   ],
   "end_xy": [
    634258.6310125228,
    4615016.841223304
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.083338756567514,
   "start_distance_m": 242.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 243.0,
   "start_elevation_m": 224.0998496766715,
   "end_elevation_m": 224.98151645180286,
   "start_xy": [
    634279.8815137752,
    4615022.5347456345
   ],
   "end_xy": [
    634281.8133775254,
    4615023.052338574
   ]
  },
  "max_3m": {
   "gradient_pct": 43.4710016346609,
   "start_distance_m": 242.0,
   "end_distance_m": 245.0,
   "midpoint_distance_m": 243.5,
   "start_elevation_m": 224.0998496766715,
   "end_elevation_m": 225.40397972571134,
   "start_xy": [
    634279.8815137752,
    4615022.5347456345
   ],
   "end_xy": [
    634282.7793094005,
    4615023.311135043
   ]
  }
 },
 "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": [
   "max10_over_40"
  ],
  "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ct/USGS_1M_18_x63y462_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:51:22+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/connecticut-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ct-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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x63y462"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.3% over 200 m (Terrain 50), gain 32.7 m over 253 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": "New Milford",
  "county": "Connecticut"
 }
}