avoid making the edge/grid sampling arrays large for large images (#5020)

git-svn-id: https://svn.osgeo.org/gdal/branches/1.9@25706 f0d54148-0727-0410-94bb-9a71ac55c965
remove swisstopo example that encourages violating the terms of use (#5022)

git-svn-id: https://svn.osgeo.org/gdal/branches/1.9@25709 f0d54148-0727-0410-94bb-9a71ac55c965