{
 "ocl_version": "0.1.0",
 "name": "Hill Terrace",
 "slug": "hill-terrace",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 16.855282199729515,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 206.0,
   "end_distance_m": 208.0,
   "start_elevation_m": 20.734865468780075,
   "end_elevation_m": 21.071971112774666,
   "min_gradient_pct": -4.7755975477073775
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 16.477584586444276,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 44.02142449048542,
   "end_elevation_m": 44.51575202807875,
   "min_gradient_pct": -2.793594855433431
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 15.519694918770739,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 432.0,
   "end_distance_m": 437.0,
   "start_elevation_m": 51.16357707075511,
   "end_elevation_m": 51.93956181669365,
   "min_gradient_pct": -2.388880640216229
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 15.341338141409082,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 388.0,
   "start_elevation_m": 44.02142449048542,
   "end_elevation_m": 45.55555830462633,
   "min_gradient_pct": -1.8758972489882808
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 14.950319242762225,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 368.0,
   "end_distance_m": 388.0,
   "start_elevation_m": 42.565494456073885,
   "end_elevation_m": 45.55555830462633,
   "min_gradient_pct": -1.092675139448822
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 14.983335882761594,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 356.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 40.76991805738835,
   "end_elevation_m": 44.51575202807875,
   "min_gradient_pct": -0.7531171950112991
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 14.801281590781882,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 346.0,
   "end_distance_m": 396.0,
   "start_elevation_m": 39.3362005047402,
   "end_elevation_m": 46.73684130013114,
   "min_gradient_pct": 1.5667776325332383
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.108064623944962,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 306.0,
   "end_distance_m": 406.0,
   "start_elevation_m": 33.92295305613943,
   "end_elevation_m": 48.03101768008439,
   "min_gradient_pct": 3.2444473024849505
  }
 ],
 "shape": {
  "ascent_concentration": 0.351,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 368.0,
  "shape_class": "sustained"
 },
 "length_m": 588.5835006437579,
 "start_elevation_m": 3.268896081979239,
 "end_elevation_m": 60.93139269020115,
 "endpoint_gain_m": 57.662496608221915,
 "overall_gradient_pct": 9.796825182009703,
 "accumulated_ascent_m": 58.14691488115143,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 15.519694918770739,
   "start_distance_m": 432.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 434.5,
   "start_elevation_m": 51.16357707075511,
   "end_elevation_m": 51.93956181669365,
   "start_xy": [
    195960.56263063077,
    237080.16403391116
   ],
   "end_xy": [
    195962.45773270624,
    237075.55471298916
   ]
  },
  "max_10m": {
   "gradient_pct": 15.341338141409082,
   "start_distance_m": 378.0,
   "end_distance_m": 388.0,
   "midpoint_distance_m": 383.0,
   "start_elevation_m": 44.02142449048542,
   "end_elevation_m": 45.55555830462633,
   "start_xy": [
    195971.85208248324,
    237122.38076987694
   ],
   "end_xy": [
    195963.92664987885,
    237116.2829562232
   ]
  },
  "max_20m": {
   "gradient_pct": 14.950319242762225,
   "start_distance_m": 368.0,
   "end_distance_m": 388.0,
   "midpoint_distance_m": 378.0,
   "start_elevation_m": 42.565494456073885,
   "end_elevation_m": 45.55555830462633,
   "start_xy": [
    195979.8759284654,
    237128.34884290383
   ],
   "end_xy": [
    195963.92664987885,
    237116.2829562232
   ]
  },
  "max_25m": {
   "gradient_pct": 14.983335882761594,
   "start_distance_m": 356.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 368.5,
   "start_elevation_m": 40.76991805738835,
   "end_elevation_m": 44.51575202807875,
   "start_xy": [
    195989.504543644,
    237135.51053053612
   ],
   "end_xy": [
    195969.46357633552,
    237120.56576434564
   ]
  },
  "max_50m": {
   "gradient_pct": 14.801281590781882,
   "start_distance_m": 346.0,
   "end_distance_m": 396.0,
   "midpoint_distance_m": 371.0,
   "start_elevation_m": 39.3362005047402,
   "end_elevation_m": 46.73684130013114,
   "start_xy": [
    195997.52991409338,
    237141.47639463368
   ],
   "end_xy": [
    195957.57764587732,
    237111.41577953022
   ]
  },
  "max_100m": {
   "gradient_pct": 14.108064623944962,
   "start_distance_m": 306.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 356.0,
   "start_elevation_m": 33.92295305613943,
   "end_elevation_m": 48.03101768008439,
   "start_xy": [
    196033.46255658756,
    237158.203159571
   ],
   "end_xy": [
    195951.59730916703,
    237103.60179049557
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.388880640216229,
   "start_distance_m": 525.0,
   "end_distance_m": 530.0,
   "midpoint_distance_m": 527.5,
   "start_elevation_m": 57.62926682724249,
   "end_elevation_m": 57.50982279523168,
   "start_xy": [
    195999.90653974397,
    237067.26164146175
   ],
   "end_xy": [
    196004.4579247671,
    237069.33164010211
   ]
  },
  "min_10m": {
   "gradient_pct": -1.8758972489882808,
   "start_distance_m": 520.0,
   "end_distance_m": 530.0,
   "midpoint_distance_m": 525.0,
   "start_elevation_m": 57.697412520130506,
   "end_elevation_m": 57.50982279523168,
   "start_xy": [
    195995.3551547208,
    237065.1916428214
   ],
   "end_xy": [
    196004.4579247671,
    237069.33164010211
   ]
  },
  "min_20m": {
   "gradient_pct": -1.092675139448822,
   "start_distance_m": 511.0,
   "end_distance_m": 531.0,
   "midpoint_distance_m": 521.0,
   "start_elevation_m": 57.69789215082374,
   "end_elevation_m": 57.479357122933976,
   "start_xy": [
    195987.16266167915,
    237061.4656452687
   ],
   "end_xy": [
    196005.36820177172,
    237069.7456398302
   ]
  },
  "min_25m": {
   "gradient_pct": -0.7531171950112991,
   "start_distance_m": 512.0,
   "end_distance_m": 537.0,
   "midpoint_distance_m": 524.5,
   "start_elevation_m": 57.69635311012411,
   "end_elevation_m": 57.50807381137128,
   "start_xy": [
    195988.0729386838,
    237061.87964499678
   ],
   "end_xy": [
    196010.30081560693,
    237070.44757011518
   ]
  },
  "min_50m": {
   "gradient_pct": 1.5667776325332383,
   "start_distance_m": 2.0,
   "end_distance_m": 52.0,
   "midpoint_distance_m": 27.0,
   "start_elevation_m": 3.3008639766208576,
   "end_elevation_m": 4.084252792887477,
   "start_xy": [
    196214.9460230133,
    237189.93964772936
   ],
   "end_xy": [
    196230.3163930132,
    237142.7880350983
   ]
  },
  "min_100m": {
   "gradient_pct": 3.2444473024849505,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 3.268896081979239,
   "end_elevation_m": 6.513343384464189,
   "start_xy": [
    196214.633,
    237191.915
   ],
   "end_xy": [
    196227.28781210686,
    237116.75323801435
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 16.855282199729515,
   "start_distance_m": 206.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 207.0,
   "start_elevation_m": 20.734865468780075,
   "end_elevation_m": 21.071971112774666,
   "start_xy": [
    196130.59152885573,
    237140.8458598873
   ],
   "end_xy": [
    196128.61216277228,
    237140.55931162322
   ]
  },
  "max_3m": {
   "gradient_pct": 16.477584586444276,
   "start_distance_m": 378.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 379.5,
   "start_elevation_m": 44.02142449048542,
   "end_elevation_m": 44.51575202807875,
   "start_xy": [
    195971.85208248324,
    237122.38076987694
   ],
   "end_xy": [
    195969.46357633552,
    237120.56576434564
   ]
  }
 },
 "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": 0.024,
   "obstruction_max_height_m": 6.85,
   "flagged_windows_m": []
  },
  "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:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/wales/dtm_1m/wg_del_29_195237_20220318dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_196237_20220318dtm.tif"
  ],
  "calculated_at": "2026-08-12T23:12:02+00:00",
  "road_source": "trunk-adopted-routes/hill-terrace.geojson",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
   "wg_del_29_195237_20220318dtm.tif",
   "wg_del_29_196237_20220318dtm.tif"
  ],
  "elevation_capture_dates": [
   "18-03-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.0% over 200 m (Terrain 50), gain 36.9 m over 292 m way. EXTENDED by graph walk: +1 segment(s) at base, +3 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all."
 },
 "area": {
  "place": "Carreg yr Eos",
  "county": "Sir Benfro - Pembrokeshire"
 },
 "reported_claims": [],
 "confidence": "A"
}