Python problem using GDAL

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I used the instructions at https://pythongisandstuff.wordpress.com/2011/07/07/installing-gdal-and-ogr-for-python-on-windows/

I downloaded the following files:

  • GDAL-1.11.1.win-amd64-py2.7.msi
  • gdal-111-1800-x64-core.msi
Then I followed the above instructions. When I type

from osgeo import gdal

at the Python IDLE command line, everything appears to be OK. Then I type in

ds = gdal.Open( 'C:/testfile.DT1')

and again, it appears to be OK. However, when I type in

gt = ds.GetGeoTransform()

I get the following error message:

Traceback (most recent call last): File "", line 1, in gt = ds.GetGeoTransform()AttributeError: 'NoneType' object has no attribute 'GetGeoTransform'I have checked the DTED file and there is nothing wrong with it. I also tried the above with a tif and got the same result. I can get the GDAL executables to run, but not the GDAL Python scripts. Is there something that I should check regarding my install of GDAL?



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