>>> from liblas import srs
  >>> from liblas import point
  >>> from liblas import header
  
  >>> import liblas

  
  >>> from liblas import file
  >>> f = file.File('../test/data/1.2_3.las',mode='r')
  >>> s = f.header.srs
  >>> s.proj4
  ''
  >>> del f


  >>> def new_offset(old_scale, new_scale, old_offset, x):
  ...       return (new_scale*(x - old_offset) - old_scale*x)/(-1.0*old_scale)