def extent_from_vectorbak(x, y, ew = 5000):
    """Return extents of a map from the centre point. Return coordinates in format of matplotlib 'get_extent'"""
    width = ew / 2
    height = ew / 2 * 210 / 297
    w = x - width
    e = x + width
    s = y - height
    n = y + height
    return(w,e,s,n)