{
 "ocl_version": "0.1.0",
 "name": "Manhattan Road",
 "slug": "manhattan-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.05144709414384,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 99.0,
   "end_distance_m": 101.0,
   "start_elevation_m": 190.44795088426932,
   "end_elevation_m": 190.8889798261522,
   "min_gradient_pct": -10.35554473436946
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.936878914842357,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 99.0,
   "end_distance_m": 102.0,
   "start_elevation_m": 190.44795088426932,
   "end_elevation_m": 191.1060572517146,
   "min_gradient_pct": -10.309351651301313
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.732352226858325,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 97.0,
   "end_distance_m": 102.0,
   "start_elevation_m": 190.01943964037167,
   "end_elevation_m": 191.1060572517146,
   "min_gradient_pct": -10.272973088389676
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.533130683090178,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 91.0,
   "end_distance_m": 101.0,
   "start_elevation_m": 188.73566675784318,
   "end_elevation_m": 190.8889798261522,
   "min_gradient_pct": -9.9556755387502
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.34165685068737,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 188.73566675784318,
   "end_elevation_m": 193.00399812798065,
   "min_gradient_pct": -9.664270423634918
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.1514733650165,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 88.0,
   "end_distance_m": 113.0,
   "start_elevation_m": 188.12998251029444,
   "end_elevation_m": 193.41785085154856,
   "min_gradient_pct": -9.568510551368263
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.0846367225015,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 63.0,
   "end_distance_m": 113.0,
   "start_elevation_m": 182.87553249029781,
   "end_elevation_m": 193.41785085154856,
   "min_gradient_pct": -8.961472196589341
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.615876935949075,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 35.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 177.7194358985734,
   "end_elevation_m": 197.33531283452248,
   "min_gradient_pct": -3.872096443965887
  }
 ],
 "shape": {
  "ascent_concentration": 0.464,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 207.0,
  "shape_class": "stepped"
 },
 "length_m": 320.92369332834795,
 "start_elevation_m": 174.82854660318094,
 "end_elevation_m": 204.61283070182805,
 "endpoint_gain_m": 29.784284098647106,
 "overall_gradient_pct": 9.28079936689928,
 "accumulated_ascent_m": 35.23314586843634,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.732352226858325,
   "start_distance_m": 97.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 99.5,
   "start_elevation_m": 190.01943964037167,
   "end_elevation_m": 191.1060572517146,
   "start_xy": [
    265094.17877453193,
    4684126.233868806
   ],
   "end_xy": [
    265098.65559139,
    4684128.460550377
   ]
  },
  "max_10m": {
   "gradient_pct": 21.533130683090178,
   "start_distance_m": 91.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 96.0,
   "start_elevation_m": 188.73566675784318,
   "end_elevation_m": 190.8889798261522,
   "start_xy": [
    265088.80659430224,
    4684123.56185092
   ],
   "end_xy": [
    265097.7602280184,
    4684128.015214063
   ]
  },
  "max_20m": {
   "gradient_pct": 21.34165685068737,
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 101.0,
   "start_elevation_m": 188.73566675784318,
   "end_elevation_m": 193.00399812798065,
   "start_xy": [
    265088.80659430224,
    4684123.56185092
   ],
   "end_xy": [
    265106.7138617345,
    4684132.468577205
   ]
  },
  "max_25m": {
   "gradient_pct": 21.1514733650165,
   "start_distance_m": 88.0,
   "end_distance_m": 113.0,
   "midpoint_distance_m": 100.5,
   "start_elevation_m": 188.12998251029444,
   "end_elevation_m": 193.41785085154856,
   "start_xy": [
    265086.12050418736,
    4684122.225841978
   ],
   "end_xy": [
    265108.5045884777,
    4684133.359249834
   ]
  },
  "max_50m": {
   "gradient_pct": 21.0846367225015,
   "start_distance_m": 63.0,
   "end_distance_m": 113.0,
   "midpoint_distance_m": 88.0,
   "start_elevation_m": 182.87553249029781,
   "end_elevation_m": 193.41785085154856,
   "start_xy": [
    265063.73777993256,
    4684111.089802786
   ],
   "end_xy": [
    265108.5045884777,
    4684133.359249834
   ]
  },
  "max_100m": {
   "gradient_pct": 19.615876935949075,
   "start_distance_m": 35.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 85.0,
   "start_elevation_m": 177.7194358985734,
   "end_elevation_m": 197.33531283452248,
   "start_xy": [
    265039.9734693537,
    4684096.354383016
   ],
   "end_xy": [
    265128.86891399085,
    4684141.196122908
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.272973088389676,
   "start_distance_m": 288.0,
   "end_distance_m": 293.0,
   "midpoint_distance_m": 290.5,
   "start_elevation_m": 207.40016004350807,
   "end_elevation_m": 206.88651138908858,
   "start_xy": [
    265278.8775031307,
    4684111.845413067
   ],
   "end_xy": [
    265283.7748116659,
    4684110.837261734
   ]
  },
  "min_10m": {
   "gradient_pct": -9.9556755387502,
   "start_distance_m": 285.0,
   "end_distance_m": 295.0,
   "midpoint_distance_m": 290.0,
   "start_elevation_m": 207.68433680227145,
   "end_elevation_m": 206.68876924839643,
   "start_xy": [
    265275.9391180096,
    4684112.450303867
   ],
   "end_xy": [
    265285.73373507994,
    4684110.4340012
   ]
  },
  "min_20m": {
   "gradient_pct": -9.664270423634918,
   "start_distance_m": 280.0,
   "end_distance_m": 300.0,
   "midpoint_distance_m": 290.0,
   "start_elevation_m": 208.15067231895384,
   "end_elevation_m": 206.21781823422685,
   "start_xy": [
    265271.0418094744,
    4684113.4584552
   ],
   "end_xy": [
    265290.6310436151,
    4684109.425849867
   ]
  },
  "min_25m": {
   "gradient_pct": -9.568510551368263,
   "start_distance_m": 276.0,
   "end_distance_m": 301.0,
   "midpoint_distance_m": 288.5,
   "start_elevation_m": 208.51940093456238,
   "end_elevation_m": 206.12727329672032,
   "start_xy": [
    265267.1239626463,
    4684114.264976268
   ],
   "end_xy": [
    265291.61050532217,
    4684109.2242196
   ]
  },
  "min_50m": {
   "gradient_pct": -8.961472196589341,
   "start_distance_m": 264.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 289.0,
   "start_elevation_m": 209.52877981887013,
   "end_elevation_m": 205.04804372057546,
   "start_xy": [
    265255.3704221618,
    4684116.684539468
   ],
   "end_xy": [
    265304.34350751364,
    4684106.603026133
   ]
  },
  "min_100m": {
   "gradient_pct": -3.872096443965887,
   "start_distance_m": 220.0,
   "end_distance_m": 320.0,
   "midpoint_distance_m": 270.0,
   "start_elevation_m": 208.54903127626613,
   "end_elevation_m": 204.67693483230025,
   "start_xy": [
    265212.27418813045,
    4684125.556665004
   ],
   "end_xy": [
    265310.2202777558,
    4684105.393244533
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.05144709414384,
   "start_distance_m": 99.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 100.0,
   "start_elevation_m": 190.44795088426932,
   "end_elevation_m": 190.8889798261522,
   "start_xy": [
    265095.96950127516,
    4684127.124541434
   ],
   "end_xy": [
    265097.7602280184,
    4684128.015214063
   ]
  },
  "max_3m": {
   "gradient_pct": 21.936878914842357,
   "start_distance_m": 99.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 100.5,
   "start_elevation_m": 190.44795088426932,
   "end_elevation_m": 191.1060572517146,
   "start_xy": [
    265095.96950127516,
    4684127.124541434
   ],
   "end_xy": [
    265098.65559139,
    4684128.460550377
   ]
  }
 },
 "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_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 251.0,
  "trailing_descent_m": 5.3
 },
 "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/ma-east/USGS_1M_19_x26y469_MA_CentralEastern_2021_B21.tif"
  ],
  "calculated_at": "2026-08-24T21:32:07+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-ma-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, MA_CentralEastern_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x26y469"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.8% over 200 m (Terrain 50), gain 29.6 m over 321 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": "Worcester",
  "county": "Massachusetts"
 }
}