{
 "ocl_version": "0.1.0",
 "name": "Florence Street",
 "slug": "florence-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.8538693691668,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 148.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 40.284351963638855,
   "end_elevation_m": 40.74142935102219,
   "min_gradient_pct": -2.884182927122936
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.65398056061419,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 148.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 40.284351963638855,
   "end_elevation_m": 40.96397138045728,
   "min_gradient_pct": -2.6971322876927197
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.644146549043995,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 145.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 39.60922202356999,
   "end_elevation_m": 40.74142935102219,
   "min_gradient_pct": -2.05376052568198
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.52768519703615,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 141.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 38.711202860753666,
   "end_elevation_m": 40.96397138045728,
   "min_gradient_pct": 0.1780498358547078
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.144291294241043,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 135.0,
   "end_distance_m": 155.0,
   "start_elevation_m": 37.41760796672281,
   "end_elevation_m": 41.84646622557102,
   "min_gradient_pct": 1.5151166054707588
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.852656641710436,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 36.99931863771776,
   "end_elevation_m": 42.462482798145366,
   "min_gradient_pct": 2.058089541701264
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.052638945434097,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 114.0,
   "end_distance_m": 164.0,
   "start_elevation_m": 33.55034317440845,
   "end_elevation_m": 43.576662647125495,
   "min_gradient_pct": 2.9932652939133106
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.303820815164997,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 70.0,
   "end_distance_m": 170.0,
   "start_elevation_m": 27.15511500456892,
   "end_elevation_m": 44.45893581973392,
   "min_gradient_pct": 3.3686373586979386
  }
 ],
 "shape": {
  "ascent_concentration": 0.411,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 235.0,
  "shape_class": "sustained"
 },
 "length_m": 394.14933106936166,
 "start_elevation_m": 16.719583732712362,
 "end_elevation_m": 58.3231357183836,
 "endpoint_gain_m": 41.60355198567123,
 "overall_gradient_pct": 10.555276568095941,
 "accumulated_ascent_m": 41.754786796919305,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.644146549043995,
   "start_distance_m": 145.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 147.5,
   "start_elevation_m": 39.60922202356999,
   "end_elevation_m": 40.74142935102219,
   "start_xy": [
    321853.7297993656,
    4620993.405538798
   ],
   "end_xy": [
    321858.334992157,
    4620991.458181781
   ]
  },
  "max_10m": {
   "gradient_pct": 22.52768519703615,
   "start_distance_m": 141.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 146.0,
   "start_elevation_m": 38.711202860753666,
   "end_elevation_m": 40.96397138045728,
   "start_xy": [
    321850.0456451325,
    4620994.9634244125
   ],
   "end_xy": [
    321859.25603071525,
    4620991.0687103765
   ]
  },
  "max_20m": {
   "gradient_pct": 22.144291294241043,
   "start_distance_m": 135.0,
   "end_distance_m": 155.0,
   "midpoint_distance_m": 145.0,
   "start_elevation_m": 37.41760796672281,
   "end_elevation_m": 41.84646622557102,
   "start_xy": [
    321844.51941378287,
    4620997.300252833
   ],
   "end_xy": [
    321862.9401849484,
    4620989.510824762
   ]
  },
  "max_25m": {
   "gradient_pct": 21.852656641710436,
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 145.5,
   "start_elevation_m": 36.99931863771776,
   "end_elevation_m": 42.462482798145366,
   "start_xy": [
    321842.6723927551,
    4620998.0664841505
   ],
   "end_xy": [
    321865.70330062316,
    4620988.342410552
   ]
  },
  "max_50m": {
   "gradient_pct": 20.052638945434097,
   "start_distance_m": 114.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 139.0,
   "start_elevation_m": 33.55034317440845,
   "end_elevation_m": 43.576662647125495,
   "start_xy": [
    321824.77149263007,
    4621004.434982773
   ],
   "end_xy": [
    321871.22953197284,
    4620986.0055821305
   ]
  },
  "max_100m": {
   "gradient_pct": 17.303820815164997,
   "start_distance_m": 70.0,
   "end_distance_m": 170.0,
   "midpoint_distance_m": 120.0,
   "start_elevation_m": 27.15511500456892,
   "end_elevation_m": 44.45893581973392,
   "start_xy": [
    321783.3607102717,
    4621019.303059508
   ],
   "end_xy": [
    321876.75327316957,
    4620983.662885638
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.05376052568198,
   "start_distance_m": 277.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 279.5,
   "start_elevation_m": 54.55542929090251,
   "end_elevation_m": 54.45274126461841,
   "start_xy": [
    321972.5989107115,
    4620936.111479826
   ],
   "end_xy": [
    321977.0380526221,
    4620933.810694222
   ]
  },
  "min_10m": {
   "gradient_pct": 0.1780498358547078,
   "start_distance_m": 275.0,
   "end_distance_m": 285.0,
   "midpoint_distance_m": 280.0,
   "start_elevation_m": 54.5091667599705,
   "end_elevation_m": 54.52697174355597,
   "start_xy": [
    321970.8170760619,
    4620937.019810868
   ],
   "end_xy": [
    321979.69823649735,
    4620932.423819409
   ]
  },
  "min_20m": {
   "gradient_pct": 1.5151166054707588,
   "start_distance_m": 267.0,
   "end_distance_m": 287.0,
   "midpoint_distance_m": 277.0,
   "start_elevation_m": 54.300826108627376,
   "end_elevation_m": 54.60384942972153,
   "start_xy": [
    321963.68973746366,
    4620940.653135035
   ],
   "end_xy": [
    321981.4716924142,
    4620931.499236199
   ]
  },
  "min_25m": {
   "gradient_pct": 2.058089541701264,
   "start_distance_m": 267.0,
   "end_distance_m": 292.0,
   "midpoint_distance_m": 279.5,
   "start_elevation_m": 54.300826108627376,
   "end_elevation_m": 54.81534849405269,
   "start_xy": [
    321963.68973746366,
    4620940.653135035
   ],
   "end_xy": [
    321985.90533220634,
    4620929.187778176
   ]
  },
  "min_50m": {
   "gradient_pct": 2.9932652939133106,
   "start_distance_m": 344.0,
   "end_distance_m": 394.0,
   "midpoint_distance_m": 369.0,
   "start_elevation_m": 56.82538799138004,
   "end_elevation_m": 58.322020638336696,
   "start_xy": [
    322032.01518604445,
    4620905.148614733
   ],
   "end_xy": [
    322076.3515839657,
    4620882.0340345
   ]
  },
  "min_100m": {
   "gradient_pct": 3.3686373586979386,
   "start_distance_m": 268.0,
   "end_distance_m": 368.0,
   "midpoint_distance_m": 318.0,
   "start_elevation_m": 54.3383353340749,
   "end_elevation_m": 57.70697269277284,
   "start_xy": [
    321964.5806547884,
    4620940.198969514
   ],
   "end_xy": [
    322053.29665704665,
    4620894.053616221
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.8538693691668,
   "start_distance_m": 148.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 149.0,
   "start_elevation_m": 40.284351963638855,
   "end_elevation_m": 40.74142935102219,
   "start_xy": [
    321856.4929150404,
    4620992.237124587
   ],
   "end_xy": [
    321858.334992157,
    4620991.458181781
   ]
  },
  "max_3m": {
   "gradient_pct": 22.65398056061419,
   "start_distance_m": 148.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 149.5,
   "start_elevation_m": 40.284351963638855,
   "end_elevation_m": 40.96397138045728,
   "start_xy": [
    321856.4929150404,
    4620992.237124587
   ],
   "end_xy": [
    321859.25603071525,
    4620991.0687103765
   ]
  }
 },
 "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/ma-east/USGS_1M_19_x32y463_MA_CentralEastern_2021_B21.tif"
  ],
  "calculated_at": "2026-08-24T21:43:41+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": [
   "x32y463"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.6% over 200 m (Terrain 50), gain 27.2 m over 168 m way. EXTENDED by graph walk: +0 segment(s) at base, +3 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": "Fall River",
  "county": "Massachusetts"
 }
}