[gdal-dev] Cannot set simple geotransform

[Jon Morris]

I've just spent most of the afternoon banging my head against the desk because it appears that you cannot set a geotransform of (0, 1, 0, 0, 0, -1). Any other value works fine, but with this particular GT, the change is not saved when you close the ds. Is this a known issue? I'm using GDAL 2.2.0 on Python 3.6.8.

IPython console:

In [269]: ds=gdal.GetDriverByName('GTiff').Create('/tmp/test.tif',5,5,1,gdal.GDT_Byte)

In [270]: ds.GetGeoTransform()
Out[270]: (0.0, 1.0, 0.0, 0.0, 0.0, 1.0)

In [271]: ds.SetGeoTransform((0,1,0,0,0,-1))
Out[271]: 0

In [272]: del ds

In [273]: ds=gdal.OpenEx('/tmp/test.tif',gdal.GA_Update)

In [274]: ds.GetGeoTransform()
Out[274]: (0.0, 1.0, 0.0, 0.0, 0.0, 1.0)

In [275]: ds.SetGeoTransform((0,1,0,0,0,-1.000000001))
Out[275]: 0

In [276]: del ds

In [277]: ds=gdal.OpenEx('/tmp/test.tif',gdal.GA_Update)

In [278]: ds.GetGeoTransform()
Out[278]: (0.0, 1.0, 0.0, 0.0, 0.0, -1.000000001)



Thanks,

Jon

Jon Morris
Software Developer

Skype<sip:jon.morris at jbarisk.com>


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