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This only happens in case an array dimension has only one element or a single row/column/band is requested:

im = GeoArray('/home/gfz-fe/scheffler/temp/Landsat-8__OLI_TIRS__LC81940242014072LGN00_L2B.bsq')
sub = im.get_subset(xslice=slice(0, 1))

OUT:
ValueError                                Traceback (most recent call last)
<ipython-input-133-c683229ddcbd> in <module>()
      1 im = GeoArray('/home/gfz-fe/scheffler/temp/Landsat-8__OLI_TIRS__LC81940242014072LGN00_L2B.bsq')
----> 2 sub = im.get_subset(xslice=slice(0, 1))
      3 sub.shape

~/scheffler/python/geoarray/geoarray/baseclasses.py in get_subset(self, xslice, yslice, zslice, return_GeoArray, reset_bandnames)
   1541 
   1542         sub_gA.gt = sub_gt
-> 1543         sub_gA.metadata = _meta_out
   1544         sub_gA.bandnames = bNs_out
   1545         sub_gA.filePath = self.filePath

~/scheffler/python/geoarray/geoarray/baseclasses.py in metadata(self, meta)
    517             raise ValueError("%s.metadata can only be set with an instance of geoarray.metadata.GDAL_Metadata of "
    518                              "which the band number corresponds to the band number of %s."
--> 519                              % (self.__class__.__name__, self.__class__.__name__))
    520         self._metadata = meta
    521 

ValueError: GeoArray.metadata can only be set with an instance of geoarray.metadata.GDAL_Metadata of which the band number corresponds to the band number of GeoArray.