{
 "ocl_version": "0.1.0",
 "name": "Forefield Rise",
 "slug": "forefield-rise",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.906789017385968,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 19.0,
   "end_distance_m": 21.0,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 29.34411215787731,
   "min_gradient_pct": -11.083625015938026
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.66495714853995,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 19.0,
   "end_distance_m": 22.0,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 29.575925091985788,
   "min_gradient_pct": -10.878974141283493
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.589902707096343,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 19.0,
   "end_distance_m": 24.0,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 30.035471512884406,
   "min_gradient_pct": -9.975777177008922
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.740044580886348,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 125.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 50.84722139817046,
   "end_elevation_m": 53.221225856259096,
   "min_gradient_pct": -6.397764909346506
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.017509567347112,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 124.0,
   "end_distance_m": 144.0,
   "start_elevation_m": 50.617350691187774,
   "end_elevation_m": 55.220852604657196,
   "min_gradient_pct": -1.2440432284277136
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.72435096186507,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 146.0,
   "start_elevation_m": 49.98125922526992,
   "end_elevation_m": 55.66234696573619,
   "min_gradient_pct": -0.45138560133227656
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.108932599970785,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 43.30451866273296,
   "end_elevation_m": 54.35898496271835,
   "min_gradient_pct": 0.9376848188242377
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.793000452146188,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 159.0,
   "start_elevation_m": 36.511714266774845,
   "end_elevation_m": 58.30471471892103,
   "min_gradient_pct": 7.3660902006698095
  }
 ],
 "shape": {
  "ascent_concentration": 0.408,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 165.0,
  "shape_class": "sustained"
 },
 "length_m": 323.3971056220111,
 "start_elevation_m": 26.76092975028958,
 "end_elevation_m": 69.85728928969644,
 "endpoint_gain_m": 43.09635953940686,
 "overall_gradient_pct": 13.326142624720395,
 "accumulated_ascent_m": 43.82756917343837,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.589902707096343,
   "start_distance_m": 19.0,
   "end_distance_m": 24.0,
   "midpoint_distance_m": 21.5,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 30.035471512884406,
   "start_xy": [
    375588.60779363045,
    164024.0758799955
   ],
   "end_xy": [
    375584.2862181075,
    164021.56112683014
   ]
  },
  "max_10m": {
   "gradient_pct": 23.740044580886348,
   "start_distance_m": 125.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 130.0,
   "start_elevation_m": 50.84722139817046,
   "end_elevation_m": 53.221225856259096,
   "start_xy": [
    375495.8236660946,
    163972.9128391621
   ],
   "end_xy": [
    375486.81495304574,
    163968.57197738273
   ]
  },
  "max_20m": {
   "gradient_pct": 23.017509567347112,
   "start_distance_m": 124.0,
   "end_distance_m": 144.0,
   "midpoint_distance_m": 134.0,
   "start_elevation_m": 50.617350691187774,
   "end_elevation_m": 55.220852604657196,
   "start_xy": [
    375496.7245953744,
    163973.34680509713
   ],
   "end_xy": [
    375478.70716927666,
    163964.6650815384
   ]
  },
  "max_25m": {
   "gradient_pct": 22.72435096186507,
   "start_distance_m": 121.0,
   "end_distance_m": 146.0,
   "midpoint_distance_m": 133.5,
   "start_elevation_m": 49.98125922526992,
   "end_elevation_m": 55.66234696573619,
   "start_xy": [
    375499.42719480256,
    163974.64909383387
   ],
   "end_xy": [
    375476.9054991284,
    163963.79675873663
   ]
  },
  "max_50m": {
   "gradient_pct": 22.108932599970785,
   "start_distance_m": 90.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 43.30451866273296,
   "end_elevation_m": 54.35898496271835,
   "start_xy": [
    375526.98470932717,
    163988.81583718324
   ],
   "end_xy": [
    375482.31049527717,
    163966.4017563214
   ]
  },
  "max_100m": {
   "gradient_pct": 21.793000452146188,
   "start_distance_m": 59.0,
   "end_distance_m": 159.0,
   "midpoint_distance_m": 109.0,
   "start_elevation_m": 36.511714266774845,
   "end_elevation_m": 58.30471471892103,
   "start_xy": [
    375554.02531547926,
    164003.97517671174
   ],
   "end_xy": [
    375464.2341697003,
    163961.0358838123
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.975777177008922,
   "start_distance_m": 318.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 320.5,
   "start_elevation_m": 70.39058153532991,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375433.96380148164,
    163850.5759640308
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  },
  "min_10m": {
   "gradient_pct": -6.397764909346506,
   "start_distance_m": 313.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 318.0,
   "start_elevation_m": 70.53156916741412,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375430.1095506963,
    163853.6635238606
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  },
  "min_20m": {
   "gradient_pct": -1.2440432284277136,
   "start_distance_m": 303.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 70.14060132216501,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375425.9760327421,
    163862.76879038624
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  },
  "min_25m": {
   "gradient_pct": -0.45138560133227656,
   "start_distance_m": 298.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 310.5,
   "start_elevation_m": 70.00463907681254,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375423.9469159156,
    163867.3385477856
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  },
  "min_50m": {
   "gradient_pct": 0.9376848188242377,
   "start_distance_m": 273.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 298.0,
   "start_elevation_m": 69.42295026706735,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375413.9110334393,
    163890.2214845794
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  },
  "min_100m": {
   "gradient_pct": 7.3660902006698095,
   "start_distance_m": 223.0,
   "end_distance_m": 323.0,
   "midpoint_distance_m": 273.0,
   "start_elevation_m": 62.52570247580966,
   "end_elevation_m": 69.89179267647947,
   "start_xy": [
    375455.01632776775,
    163909.30755640235
   ],
   "end_xy": [
    375438.87091827154,
    163850.52050194028
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.906789017385968,
   "start_distance_m": 19.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 20.0,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 29.34411215787731,
   "start_xy": [
    375588.60779363045,
    164024.0758799955
   ],
   "end_xy": [
    375586.87911282695,
    164023.07006568514
   ]
  },
  "max_3m": {
   "gradient_pct": 25.66495714853995,
   "start_distance_m": 19.0,
   "end_distance_m": 22.0,
   "midpoint_distance_m": 20.5,
   "start_elevation_m": 28.80597637752959,
   "end_elevation_m": 29.575925091985788,
   "start_xy": [
    375588.60779363045,
    164024.0758799955
   ],
   "end_xy": [
    375586.01489890757,
    164022.56694114642
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.043,
   "obstruction_max_height_m": 6.44,
   "flagged_windows_m": []
  },
  "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:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/england/bulk_dtm_1m/ST7560.tif"
  ],
  "calculated_at": "2026-08-19T18:34:27+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
  "elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
  "elevation_tile_ids": [
   "ST7560.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.2% over 200 m (Terrain 50), gain 30.4 m over 167 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 (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Bath",
  "county": "Bath and North East Somerset"
 }
}