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 "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": {
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  "extent": [
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 "provenance": {
  "analysis_version": "0.1.0",
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   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.2",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.2",
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   "road_pbf": "no-b03-block-batch-no-b03.osm.pbf",
   "region_key": "norway",
   "crs": "EPSG:25833",
   "elevation_provider_key": "nhm-no",
   "tile_index": "nhm-window",
   "authority": "nvdb",
   "registry_pbf": "norway-2026-10-01.osm.pbf"
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  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
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   50.0,
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  "diagnostic_windows_m": [
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  "scale_correction": "point",
  "scale_correction_crs": "EPSG:25833",
  "elevation_crs": "EPSG:25833",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/no/nhm-no_dtm_E-11500-N6706500_1m.tif",
   "data/cache/no/nhm-no_dtm_E-11500-N6707000_1m.tif",
   "data/cache/no/nhm-no_dtm_E-11500-N6707500_1m.tif",
   "data/cache/no/nhm-no_dtm_E-11000-N6706500_1m.tif",
   "data/cache/no/nhm-no_dtm_E-11000-N6707000_1m.tif",
   "data/cache/no/nhm-no_dtm_E-11000-N6707500_1m.tif"
  ],
  "calculated_at": "2026-10-03T23:37:40+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/no-b03-block-batch-no-b03.osm.pbf",
  "osm_snapshot": "",
  "run_id": "no-b03",
  "elevation_provider": "Kartverket NHM DTM 1 m (laser-covered ground only)",
  "elevation_licence": "CC BY 4.0 \u2014 \u00a9 Kartverket (https://www.kartverket.no/api-og-data/vilkar-for-bruk)",
  "elevation_dataset": "Nasjonal h\u00f8ydemodell (NHM) DTM, 1 m, EPSG:25833, NN2000 (Kartverket), served by the hoydedata.no ImageServer; ground without a laser project is a coarser resampled product and is never measured",
  "elevation_vertical_datum": "NN2000",
  "elevation_tile_ids": [
   "E-11500-N6706500",
   "E-11500-N6707000",
   "E-11500-N6707500",
   "E-11000-N6706500",
   "E-11000-N6707000",
   "E-11000-N6707500"
  ],
  "elevation_blocks": [
   "nhm-dtm-1m"
  ],
  "nhm_laser_projects": [
   {
    "last_flight_date": "2016-10-11",
    "name": "NDH Tysnes-Fusa 2pkt 2016",
    "points_per_m2": 2,
    "resolution_m": 0.5,
    "season": "",
    "year": 2016
   },
   {
    "last_flight_date": "2024-06-24",
    "name": "Samnanger Bj\u00f8rnafjorden del2 10pkt 2024",
    "points_per_m2": 10,
    "resolution_m": 0.25,
    "season": "",
    "year": 2024
   },
   {
    "last_flight_date": "2010-01-01",
    "name": "Sunnhordaland 2010",
    "points_per_m2": 2,
    "resolution_m": 0.5,
    "season": "season-unknown",
    "year": 2010
   }
  ],
  "nhm_last_flight_date": "2024-06-24",
  "nhm_flight_season_unknown": [
   "Sunnhordaland 2010"
  ],
  "nhm_retrieved_at": "2026-10-03T09:55:25Z",
  "nhm_note": "laser projects overlapping the route's cells; the mosaic draws on them by its own priority and which project supplied which pixel is not recorded",
  "climb_origin": "discovered",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "structure_own_ways": 3,
  "tunnel_check": "osm tunnel=* ways on 3 own way(s)",
  "tunnel_ranges_m": [],
  "underground_fraction": 0.0,
  "carriageway": {
   "stations": 58,
   "stations_resolved": 58,
   "width_median_m": 5.0,
   "width_p10_m": 3.92,
   "width_min_m": 2.25,
   "width_max_m": 12.0,
   "bounded_share": 0.362,
   "unbounded_share": 0.638,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.5,
   "window_m": [
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    625.0
   ],
   "width_at_max25_m": 4.5,
   "window_stations": 6,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 58,
    "stations_resolved": 58,
    "width_median_m": 6.25,
    "width_p10_m": 1.25,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.707,
    "unbounded_share": 0.293,
    "confidence_median": 1.0,
    "width_median_bounded_m": 5.5,
    "window_m": [
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     625.0
    ],
    "width_at_max25_m": 2.12,
    "window_stations": 6,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "unmapped_bridge_span_unstable": {
   "start_m": 330.0,
   "end_m": 416.0,
   "span_m": 86.0,
   "floor_at_m": 345.0,
   "depth_m": 8.0,
   "drop_m": 4.3,
   "surface": "raw",
   "window_start_m": 600.0,
   "window_end_m": 625.0,
   "gap_m": 184.0,
   "unstable": true,
   "perturbation_hits": 1,
   "perturbations": [
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    0.3333,
    0.6667
   ],
   "ruling": "the dip is not found at every sampling phase \u2014 reported, never held on (Peter 2026-09-20, suppression-verdict-stability)",
   "note": "A dip of 4 m below the road between 330 m and 416 m is found at some sampling phases and not others (1 of 3). Reported for a person; the page is NOT held on it (suppression-verdict-stability, Peter 2026-09-20)."
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bj\u00f8rnafjorden",
  "county": "Vestland",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}