tms_image.py 文件源码

def __init__(self, access_token=os.environ.get("DG_MAPS_API_TOKEN"),
                 url="https://api.mapbox.com/v4/digitalglobe.nal0g75k/{z}/{x}/{y}.png",
                 zoom=22, bounds=None):
        self.zoom_level = zoom
        self._token = access_token
        self._name = "image-{}".format(str(uuid.uuid4()))
        self._url_template = url + "?access_token={token}"

        _first_tile = mercantile.Tile(z=self.zoom_level, x=0, y=0)
        _last_tile = mercantile.Tile(z=self.zoom_level, x=180, y=-85.05)
        g = box(*mercantile.xy_bounds(_first_tile)).union(box(*mercantile.xy_bounds(_last_tile)))

        self._full_bounds = g.bounds

        # TODO: populate rest of fields automatically
        self._tile_size = 256
        self._nbands = 3
        self._dtype = "uint8"
        self.bounds = self._expand_bounds(bounds)
        self._chunks = tuple([self._nbands] + [self._tile_size, self._tile_size])