{
  "publisher": "OpenStreetMap contributors; osmcoastline processing; unofficial osmdata.org mirror",
  "license": "ODbL-1.0",
  "coastline": {
    "url": "https://www.osmdata.org/download/simplified-land-polygons-complete-3857.zip",
    "upstream": "https://osmdata.openstreetmap.de/download/simplified-land-polygons-complete-3857.zip",
    "mirror": "Unofficial North America mirror, linked by OSM community; upstream currently unavailable",
    "lastModified": "Tue, 03 Nov 2026 03:49:03 GMT",
    "etag": "\"6ae959af-17511ec\"",
    "license": "ODbL-1.0",
    "projection": "EPSG:3857",
    "simplification": "Publisher variant for zoom0-9; not original full coastline geometry",
    "sha256": "b1e5cecb7fb7626b8d18125cbd766c9dec7dea3215e057a82873a26f43fa5c67",
    "bytes": 24449516,
    "sourceShape": "simplified-land-polygons-complete-3857/simplified_land_polygons.shp",
    "shapeBytes": 31847416
  },
  "inlandWater": {
    "publisher": "Natural Earth",
    "license": "Public Domain",
    "scale": "1:10 million, not 10 metres",
    "name": "ne_10m_lakes.geojson",
    "url": "https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_10m_lakes.geojson",
    "gitBlob": "e48ec603e0943b62f8c81960fb990bb6bab4a4a8",
    "sha256": "2d036f53dedec578001c5c30c2959ee7d4eebc1306900fa4367c49929ec8f2d9",
    "bytes": 5043554
  },
  "gridCellsPerDegree": 256,
  "gridKmNorthSouthApprox": 0.4344,
  "rasterization": "Global OSM land union minus Natural Earth lake polygons; exact cell-centre parity. No regional or city exceptions. EPSG3857 converted to lon/lat; clipped polar ring closures normalized.",
  "limitations": "Static snapshot, simplified coastline publisher variant for zoom0-9; finite 0.43km N/S raster precision. Sub-grid islets/coasts and unrepresented lakes may be imperfect. Snapshot modification time is not observation time. City distribution remains NASA2012; not real-time power/weather/tides.",
  "builder": "earth-land-builder.swift",
  "builderRepositoryPath": "tool/prototypes/build_earth_land_mask.swift",
  "licenseFile": "EARTH-LAND-LICENSE.txt",
  "derivative": {
    "file": "earth-land-mask.bin",
    "bytes": 5306042,
    "sha256": "3581f646df5875e26f8780f19d36b1b4e23c0e6da4a9921446fc489ad48a016c",
    "gpuTexelBytes": 16890432,
    "header": {
      "atlasChannels": 4,
      "atlasHeight": 1023,
      "atlasLength": 16760832,
      "atlasWidth": 4096,
      "descriptorTexels": 2173696,
      "indexHeight": 180,
      "indexLength": 129600,
      "indexPackedLength": 56340,
      "indexWidth": 360,
      "mixedTiles": 8491,
      "resolution": 256,
      "subTiles": 251626,
      "version": 2
    }
  }
}
