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#!/usr/bin/env python
# ******************************************************************************
# $Id: gcps2wld.py 8e263710cb425c4a8b76b1f363b98be41ea0a983 2018-04-30 19:40:20 +1000 Ben Elliston $
#
# 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 not gcps:
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])
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