{
 "ocl_version": "0.1.0",
 "name": "Ipswich Street",
 "slug": "ipswich-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.595567164593547,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 47.29516462150559,
   "min_gradient_pct": -3.8632457235621587
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.229886501234233,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 112.0,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 47.54014987325075,
   "min_gradient_pct": -3.853684930760911
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.755904876636237,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 48.02104852204553,
   "min_gradient_pct": -3.6007168354362307
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.040697257522936,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 108.0,
   "end_distance_m": 118.0,
   "start_elevation_m": 46.54586506571985,
   "end_elevation_m": 48.949934791472145,
   "min_gradient_pct": -3.191923432239463
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.32125838642316,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 106.0,
   "end_distance_m": 126.0,
   "start_elevation_m": 46.10555515565927,
   "end_elevation_m": 50.7698068329439,
   "min_gradient_pct": -3.0050318900721606
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.73400838017224,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 105.0,
   "end_distance_m": 130.0,
   "start_elevation_m": 45.91226002468478,
   "end_elevation_m": 51.59576211972784,
   "min_gradient_pct": -3.0735576330284857
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.950221608732335,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 154.0,
   "end_distance_m": 204.0,
   "start_elevation_m": 55.05550334575959,
   "end_elevation_m": 65.53061415012576,
   "min_gradient_pct": -2.044796193318234
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.7955080338836,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 105.0,
   "end_distance_m": 205.0,
   "start_elevation_m": 45.91226002468478,
   "end_elevation_m": 65.70776805856838,
   "min_gradient_pct": -0.8917027856578983
  }
 ],
 "shape": {
  "ascent_concentration": 0.44,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 145.0,
  "shape_class": "sustained"
 },
 "length_m": 449.81561712327243,
 "start_elevation_m": 35.805330844881915,
 "end_elevation_m": 84.55392001769641,
 "endpoint_gain_m": 48.7485891728145,
 "overall_gradient_pct": 10.837460354217736,
 "accumulated_ascent_m": 49.94507981579236,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.755904876636237,
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 111.5,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 48.02104852204553,
   "start_xy": [
    294347.9467421128,
    4631186.507572326
   ],
   "end_xy": [
    294352.8911901593,
    4631185.766248682
   ]
  },
  "max_10m": {
   "gradient_pct": 24.040697257522936,
   "start_distance_m": 108.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 113.0,
   "start_elevation_m": 46.54586506571985,
   "end_elevation_m": 48.949934791472145,
   "start_xy": [
    294346.9569806211,
    4631186.650303504
   ],
   "end_xy": [
    294356.8339777114,
    4631185.092137178
   ]
  },
  "max_20m": {
   "gradient_pct": 23.32125838642316,
   "start_distance_m": 106.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 116.0,
   "start_elevation_m": 46.10555515565927,
   "end_elevation_m": 50.7698068329439,
   "start_xy": [
    294344.9774576376,
    4631186.935765862
   ],
   "end_xy": [
    294364.7195528156,
    4631183.743914171
   ]
  },
  "max_25m": {
   "gradient_pct": 22.73400838017224,
   "start_distance_m": 105.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 117.5,
   "start_elevation_m": 45.91226002468478,
   "end_elevation_m": 51.59576211972784,
   "start_xy": [
    294343.9876961459,
    4631187.078497042
   ],
   "end_xy": [
    294368.6623403677,
    4631183.069802668
   ]
  },
  "max_50m": {
   "gradient_pct": 20.950221608732335,
   "start_distance_m": 154.0,
   "end_distance_m": 204.0,
   "midpoint_distance_m": 179.0,
   "start_elevation_m": 55.05550334575959,
   "end_elevation_m": 65.53061415012576,
   "start_xy": [
    294392.26522153604,
    4631178.759566889
   ],
   "end_xy": [
    294440.4615984536,
    4631165.627491893
   ]
  },
  "max_100m": {
   "gradient_pct": 19.7955080338836,
   "start_distance_m": 105.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 155.0,
   "start_elevation_m": 45.91226002468478,
   "end_elevation_m": 65.70776805856838,
   "start_xy": [
    294343.9876961459,
    4631187.078497042
   ],
   "end_xy": [
    294441.43779420096,
    4631165.410600532
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.6007168354362307,
   "start_distance_m": 421.0,
   "end_distance_m": 426.0,
   "midpoint_distance_m": 423.5,
   "start_elevation_m": 85.42531841360909,
   "end_elevation_m": 85.24528257183728,
   "start_xy": [
    294656.19490528904,
    4631178.439640031
   ],
   "end_xy": [
    294661.1935711977,
    4631178.5551352
   ]
  },
  "min_10m": {
   "gradient_pct": -3.191923432239463,
   "start_distance_m": 420.0,
   "end_distance_m": 430.0,
   "midpoint_distance_m": 425.0,
   "start_elevation_m": 85.45164325070598,
   "end_elevation_m": 85.13245090748204,
   "start_xy": [
    294655.19509999856,
    4631178.4270123225
   ],
   "end_xy": [
    294665.19250392454,
    4631178.647531335
   ]
  },
  "min_20m": {
   "gradient_pct": -3.0050318900721606,
   "start_distance_m": 423.0,
   "end_distance_m": 443.0,
   "midpoint_distance_m": 433.0,
   "start_elevation_m": 85.35638885703175,
   "end_elevation_m": 84.75538247901731,
   "start_xy": [
    294658.1943716525,
    4631178.485838098
   ],
   "end_xy": [
    294678.03893749084,
    4631180.106274038
   ]
  },
  "min_25m": {
   "gradient_pct": -3.0735576330284857,
   "start_distance_m": 422.0,
   "end_distance_m": 447.0,
   "midpoint_distance_m": 434.5,
   "start_elevation_m": 85.39473449048333,
   "end_elevation_m": 84.62634508222621,
   "start_xy": [
    294657.19463847077,
    4631178.462739064
   ],
   "end_xy": [
    294681.92936928495,
    4631181.036080714
   ]
  },
  "min_50m": {
   "gradient_pct": -2.044796193318234,
   "start_distance_m": 399.0,
   "end_distance_m": 449.0,
   "midpoint_distance_m": 424.0,
   "start_elevation_m": 85.59450811299217,
   "end_elevation_m": 84.57211001633306,
   "start_xy": [
    294634.1960137496,
    4631178.62291206
   ],
   "end_xy": [
    294683.5300386172,
    4631182.193945999
   ]
  },
  "min_100m": {
   "gradient_pct": -0.8917027856578983,
   "start_distance_m": 349.0,
   "end_distance_m": 449.0,
   "midpoint_distance_m": 399.0,
   "start_elevation_m": 85.46381280199095,
   "end_elevation_m": 84.57211001633306,
   "start_xy": [
    294584.2327458136,
    4631177.296984194
   ],
   "end_xy": [
    294683.5300386172,
    4631182.193945999
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.595567164593547,
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 47.29516462150559,
   "start_xy": [
    294347.9467421128,
    4631186.507572326
   ],
   "end_xy": [
    294349.9262650963,
    4631186.222109968
   ]
  },
  "max_3m": {
   "gradient_pct": 25.229886501234233,
   "start_distance_m": 109.0,
   "end_distance_m": 112.0,
   "midpoint_distance_m": 110.5,
   "start_elevation_m": 46.78325327821372,
   "end_elevation_m": 47.54014987325075,
   "start_xy": [
    294347.9467421128,
    4631186.507572326
   ],
   "end_xy": [
    294350.916026588,
    4631186.079378788
   ]
  }
 },
 "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"
  ]
 },
 "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/ri/USGS_1M_19_x29y464_RI_Statewide_D22.tif"
  ],
  "calculated_at": "2026-08-24T22:23:28+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/rhode-island-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ri-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, RI_Statewide_D22 (collected 2022)",
  "elevation_tile_ids": [
   "x29y464"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.5% over 200 m (Terrain 50), gain 39.6 m over 355 m way. EXTENDED by graph walk: +2 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_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": "Johnston",
  "county": "Rhode Island"
 }
}