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Spherical mercator and XYZ tile utilities

Project description

Spherical mercator coordinate and tile utilities

The mercantile module provides ul(xtile, ytile, zoom) and bounds(xtile, ytile, zoom) functions that return longitudes and latitudes for XYZ tiles, and a xy(lon, lat) function that returns spherical mercator x and y coordinates.

>>> import mercantile
>>> mercantile.ul(486, 332, 10)
(-9.140625, 53.33087298301705)
>>> mercantile.bounds(486, 332, 10)
(-9.140625, 53.12040528310657, -8.7890625, 53.33087298301705)
>>> mercantile.xy(*mercantile.ul(486, 332, 10))
(-1017529.7205322663, 7044436.526761846)

mercantile.tool

Mercantile includes a script that writes the extent of an XYZ tile out as GeoJSON.

$ python -mmercantile.tool 20,35,6 --pretty
{
  "features": [
    {
      "geometry": {
        "coordinates": [
          [
            [
              -67.5,
              -21.943046
            ],
            [
              -67.5,
              -16.636192
            ],
            [
              -61.875,
              -16.636192
            ],
            [
              -61.875,
              -21.943046
            ],
            [
              -67.5,
              -21.943046
            ]
          ]
        ],
        "type": "Polygon"
      },
      "id": "20,35,6",
      "properties": {
        "title": "XYZ tile 20,35,6"
      },
      "type": "Feature"
    }
  ],
  "type": "FeatureCollection"
}

If you have geojsonio-cli installed, you can shoot this GeoJSON straight to geojson.io for lightning-fast visualization and editing.

$ python -mmercantile.tool 20,35,6 --compact | geojsonio

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