{
 "ocl_version": "0.1.0",
 "name": "Church Hill Road",
 "slug": "church-hill-road-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 52.573846714538774,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.33904602062321,
   "min_gradient_pct": -0.4691976186819602
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.91188998899705,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.51492578600235,
   "min_gradient_pct": -0.30727841929660826
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.622480631486496,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.51869311790676,
   "min_gradient_pct": -0.16382394210950224
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.571864726020806,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 237.0,
   "end_distance_m": 247.0,
   "start_elevation_m": 161.2939722118863,
   "end_elevation_m": 163.6511586844884,
   "min_gradient_pct": 0.10027196941905459
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.044768722681596,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 230.0,
   "end_distance_m": 250.0,
   "start_elevation_m": 159.86307070751417,
   "end_elevation_m": 164.2720244520505,
   "min_gradient_pct": 0.22109771401915168
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.474041471972214,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 229.0,
   "end_distance_m": 254.0,
   "start_elevation_m": 159.67315610274707,
   "end_elevation_m": 165.04166647074013,
   "min_gradient_pct": 0.2536435856559365
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.495759748723515,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 220.0,
   "end_distance_m": 270.0,
   "start_elevation_m": 158.24172303628225,
   "end_elevation_m": 167.489602910644,
   "min_gradient_pct": 0.5235790831388272
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.60785997577409,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 186.0,
   "end_distance_m": 286.0,
   "start_elevation_m": 154.6794335054733,
   "end_elevation_m": 169.2872934812474,
   "min_gradient_pct": 0.8727505589381792
  }
 ],
 "shape": {
  "ascent_concentration": 0.392,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 104.0,
  "shape_class": "sustained"
 },
 "length_m": 821.6270116914902,
 "start_elevation_m": 136.28756908633244,
 "end_elevation_m": 206.74627176849663,
 "endpoint_gain_m": 70.45870268216419,
 "overall_gradient_pct": 8.575509529209645,
 "accumulated_ascent_m": 70.48367544654207,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.622480631486496,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.51869311790676,
   "start_xy": [
    638796.869,
    4575278.345
   ],
   "end_xy": [
    638792.1774426986,
    4575276.617496292
   ]
  },
  "max_10m": {
   "gradient_pct": 23.571864726020806,
   "start_distance_m": 237.0,
   "end_distance_m": 247.0,
   "midpoint_distance_m": 242.0,
   "start_elevation_m": 161.2939722118863,
   "end_elevation_m": 163.6511586844884,
   "start_xy": [
    638587.2209188164,
    4575180.327059623
   ],
   "end_xy": [
    638577.3079014549,
    4575179.01097194
   ]
  },
  "max_20m": {
   "gradient_pct": 22.044768722681596,
   "start_distance_m": 230.0,
   "end_distance_m": 250.0,
   "midpoint_distance_m": 240.0,
   "start_elevation_m": 159.86307070751417,
   "end_elevation_m": 164.2720244520505,
   "start_xy": [
    638593.9312334794,
    4575181.898469849
   ],
   "end_xy": [
    638574.3339962463,
    4575178.616145635
   ]
  },
  "max_25m": {
   "gradient_pct": 21.474041471972214,
   "start_distance_m": 229.0,
   "end_distance_m": 254.0,
   "midpoint_distance_m": 241.5,
   "start_elevation_m": 159.67315610274707,
   "end_elevation_m": 165.04166647074013,
   "start_xy": [
    638594.7864805452,
    4575182.41669032
   ],
   "end_xy": [
    638570.3687893017,
    4575178.089710562
   ]
  },
  "max_50m": {
   "gradient_pct": 18.495759748723515,
   "start_distance_m": 220.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 245.0,
   "start_elevation_m": 158.24172303628225,
   "end_elevation_m": 167.489602910644,
   "start_xy": [
    638602.4837041368,
    4575187.080674559
   ],
   "end_xy": [
    638554.6057766549,
    4575175.353910918
   ]
  },
  "max_100m": {
   "gradient_pct": 14.60785997577409,
   "start_distance_m": 186.0,
   "end_distance_m": 286.0,
   "midpoint_distance_m": 236.0,
   "start_elevation_m": 154.6794335054733,
   "end_elevation_m": 169.2872934812474,
   "start_xy": [
    638629.5741481172,
    4575204.213605695
   ],
   "end_xy": [
    638539.5510508426,
    4575170.394396201
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.16382394210950224,
   "start_distance_m": 403.0,
   "end_distance_m": 408.0,
   "midpoint_distance_m": 405.5,
   "start_elevation_m": 177.0284028581043,
   "end_elevation_m": 177.02021166099883,
   "start_xy": [
    638433.4488474248,
    4575121.097969354
   ],
   "end_xy": [
    638428.9021562326,
    4575119.017681104
   ]
  },
  "min_10m": {
   "gradient_pct": 0.10027196941905459,
   "start_distance_m": 402.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 407.0,
   "start_elevation_m": 177.02835397669025,
   "end_elevation_m": 177.03838117363216,
   "start_xy": [
    638434.3581856634,
    4575121.514027004
   ],
   "end_xy": [
    638425.2648032788,
    4575117.353450504
   ]
  },
  "min_20m": {
   "gradient_pct": 0.22109771401915168,
   "start_distance_m": 402.0,
   "end_distance_m": 422.0,
   "midpoint_distance_m": 412.0,
   "start_elevation_m": 177.02835397669025,
   "end_elevation_m": 177.07257351949409,
   "start_xy": [
    638434.3581856634,
    4575121.514027004
   ],
   "end_xy": [
    638416.1403359177,
    4575113.261970857
   ]
  },
  "min_25m": {
   "gradient_pct": 0.2536435856559365,
   "start_distance_m": 402.0,
   "end_distance_m": 427.0,
   "midpoint_distance_m": 414.5,
   "start_elevation_m": 177.02835397669025,
   "end_elevation_m": 177.09176487310424,
   "start_xy": [
    638434.3581856634,
    4575121.514027004
   ],
   "end_xy": [
    638411.5675711663,
    4575111.239639893
   ]
  },
  "min_50m": {
   "gradient_pct": 0.5235790831388272,
   "start_distance_m": 400.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 425.0,
   "start_elevation_m": 177.0154465625327,
   "end_elevation_m": 177.27723610410212,
   "start_xy": [
    638436.1768621402,
    4575122.346142304
   ],
   "end_xy": [
    638390.5328533103,
    4575101.936917457
   ]
  },
  "min_100m": {
   "gradient_pct": 0.8727505589381792,
   "start_distance_m": 395.0,
   "end_distance_m": 495.0,
   "midpoint_distance_m": 445.0,
   "start_elevation_m": 176.94178828660907,
   "end_elevation_m": 177.81453884554725,
   "start_xy": [
    638440.7235533325,
    4575124.426430553
   ],
   "end_xy": [
    638349.3779705487,
    4575083.735938778
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 52.573846714538774,
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "midpoint_distance_m": 1.0,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.33904602062321,
   "start_xy": [
    638796.869,
    4575278.345
   ],
   "end_xy": [
    638795.0000142675,
    4575277.633036285
   ]
  },
  "max_3m": {
   "gradient_pct": 40.91188998899705,
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "midpoint_distance_m": 1.5,
   "start_elevation_m": 136.28756908633244,
   "end_elevation_m": 137.51492578600235,
   "start_xy": [
    638796.869,
    4575278.345
   ],
   "end_xy": [
    638794.0655214014,
    4575277.277054426
   ]
  }
 },
 "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": [
   "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_x63y458_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:49:13+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": [
   "x63y458"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.5% over 200 m (Terrain 50), gain 70.0 m over 822 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": "Redding",
  "county": "Connecticut"
 }
}