code: def is_absolute(self):
          
  
          # FIXME(Ole): It is unfortunate that decision about whether points
          # are absolute or not lies with the georeference object. Ross pointed this out.
          # Moreover, this little function is responsible for a large fraction of the time
          # using in data fitting (something in like 40 - 50%.
          # This was due to the repeated calls to allclose.
          # With the flag method fitting is much faster (18 Mar 2009).
  
          # FIXME(Ole): HACK to be able to reuse data already cached (18 Mar 2009).
          # Remove at some point
          if not hasattr(self, 'absolute'):
              self.absolute = num.allclose([self.xllcorner, self.yllcorner], 0)
  
          # Return absolute flag
          return self.absolute
docs: Return True if xllcorner==yllcorner==0 indicating that points
          in question are absolute.