{
  "product": "OS Terrain 50",
  "version": "2026-07",
  "attribution": "Contains OS data \u00a9 Crown copyright and database right 2026",
  "licence": "Open Government Licence v3.0",
  "width": 1631,
  "height": 2930,
  "crs": "EPSG:4326",
  "pixel_size_crs_units": [
    0.0065,
    0.0038
  ],
  "approx_cell_size_m": [
    415.0,
    420.2
  ],
  "bounds_crs": {
    "west": -8.758998028668795,
    "south": 49.81474887680344,
    "east": 1.8425019713312043,
    "north": 60.94874887680344
  },
  "elevation_min_m": -36.92,
  "elevation_max_m": 1278.7,
  "nodata": {
    "geotiff": -9999.0,
    "meaning": "sea (OS fill -0.9), missing tiles, outside GB incl. Northern Ireland"
  },
  "png16": "row 0 = north; 0 = nodata/sea; 1..65535 linear to elevation_min_m..elevation_max_m",
  "raw": {
    "file": "gb_overview.r16",
    "dtype": "uint16",
    "byte_order": "little-endian",
    "row_order": "north to south",
    "encoding": "0 = nodata/sea; h_m = min_m + (v-1)/65534*(max_m-min_m)"
  },
  "osgb_bounds": {
    "west": 0.0,
    "south": 0.0,
    "east": 660000.0,
    "north": 1230000.0
  },
  "osgb_cell_m": 400,
  "tiles": 2858,
  "method": "8x8 block nanmean of 50 m cells -> 400 m BNG, then bilinear warp to EPSG:4326",
  "notes": "Great Britain only; Northern Ireland is nodata (Terrain 50 does not cover NI).",
  "bounds_wgs84": {
    "west": -8.758998028668795,
    "south": 49.81474887680344,
    "east": 1.8425019713312043,
    "north": 60.94874887680344
  }
}