code: func (b *Bound) String() string {
  	// west, south, west, north, east, north, east, south, west, south
  	return fmt.Sprintf("POLYGON((%g %g, %g %g, %g %g, %g %g, %g %g))", b.sw[0], b.sw[1], b.sw[0], b.ne[1], b.ne[0], b.ne[1], b.ne[0], b.sw[1], b.sw[0], b.sw[1])
  }
docs: // String returns the string respentation of the bound in WKT format.
  // POLYGON(west, south, west, north, east, north, east, south, west, south)