text: #!/usr/bin/env python
  # ******************************************************************************
  #  $Id$
  #
  #  Name:     gcps2wld
  #  Project:  GDAL Python Interface
  #  Purpose:  Translate the set of GCPs on a file into first order approximation
  #            in world file format.
  #  Author:   Frank Warmerdam, warmerdam@pobox.com
  #
  # ******************************************************************************
  #  Copyright (c) 2002, Frank Warmerdam
  #  Copyright (c) 2009-2010, Even Rouault <even dot rouault at mines-paris dot org>
  #
  #  Permission is hereby granted, free of charge, to any person obtaining a
  #  copy of this software and associated documentation files (the "Software"),
  #  to deal in the Software without restriction, including without limitation
  #  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  #  and/or sell copies of the Software, and to permit persons to whom the
  #  Software is furnished to do so, subject to the following conditions:
  #
  #  The above copyright notice and this permission notice shall be included
  #  in all copies or substantial portions of the Software.
  #
  #  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  #  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  #  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  #  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  #  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  #  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  #  DEALINGS IN THE SOFTWARE.
  # ******************************************************************************
  
  import sys
  
  from osgeo import gdal
  
  if len(sys.argv) < 2:
      print("Usage: gcps2wld.py source_file")
      sys.exit(1)
  
  filename = sys.argv[1]
  dataset = gdal.Open(filename)
  if dataset is None:
      print('Unable to open %s' % filename)
      sys.exit(1)
  
  gcps = dataset.GetGCPs()
  
  if gcps is None or len(gcps) == 0:
      print('No GCPs found on file ' + filename)
      sys.exit(1)
  
  geotransform = gdal.GCPsToGeoTransform(gcps)
  
  if geotransform is None:
      print('Unable to extract a geotransform.')
      sys.exit(1)
  
  print(geotransform[1])
  print(geotransform[4])
  print(geotransform[2])
  print(geotransform[5])
  print(geotransform[0] + 0.5 * geotransform[1] + 0.5 * geotransform[2])
  print(geotransform[3] + 0.5 * geotransform[4] + 0.5 * geotransform[5])
  