[QGIS-trac] Re: [Quantum GIS] #2444: Discrepancy between gdalinfo and QGIS raster metadata

[Quantum GIS]

#2444: Discrepancy between gdalinfo and QGIS raster metadata
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        Reporter:  alobo                             |         Owner:  nobody       
            Type:  bug                               |        Status:  new          
        Priority:  major: does not work as expected  |     Milestone:  Version 1.5.0
       Component:  Rasters                           |       Version:  HEAD         
      Resolution:                                    |      Keywords:               
Platform_version:                                    |      Platform:  Debian       
        Must_fix:  No                                |   Status_info:  0            
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Comment (by mmassing):

 Looking at the sample file you provided, I think the issue here is that
 the generated .tif
 is not north-up (i.e. the geotransform contains a non-zero rotational
 component or, in this case, a positive scale factor for the y-axis).

 Such coordinate systems are perfectly valid, but some software may not  be
 prepared to handle
 this general case.

 QGis handles this type of files by reprojecting them on the fly (using the
 gdal VRT
 mechanism). Other applications which do not explicitly support a
 rotated/flipped coordinate
 system may require you to warp the input file into a north-up orientation
 (e.g. by using "gdalwarp test2.tif test2-nu.tif", or by wrapping it in an
 appropriate
 VRT file).

 Manuel

-- 
Ticket URL: <https://trac.osgeo.org/qgis/ticket/2444#comment:1>
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