[Qgis-user] Problem with VRT format

[Patrick Giraudoux]

Le 11/08/2014 14:12, Even Rouault a écrit :
> Selon Patrick Giraudoux <patrick.giraudoux at univ-fcomte.fr>:
>
>> Dear lister,
>>
>> I meet a problem trying to wrap layers 10, 20, 30, 40, 50, 70 of
>> landstat ETM into a VRT format. Everything goes well including writing
>> the VRT file via the raster menu (see the result below), BUT when I load
>> it from QGIS and try to find the layers in the "properties" (mutiple
>> band colors), I can just access to "band1 (grey)"...
>>
>> I am working with QGIS 2.2.0 Valmiera under Windows 7 pro.
>>
>> Any idea about what happens ?
> Patrick,
>
> Yes, you have combined the files with the (default) option that is used to
> create mosaics. Which you do not want since they have the same extent, but you
> would want to make a band with each one of them. I have no QGIS at hand right
> now, but the gdalbuildvrt utility that QGIS likely uses has a -separate option
> to do what you want. Perhaps the QGIS GUI has also a "separate" checkbox for
> that. Otherwise time to go on the command line and try
> http://gdal.org/gdalbuildvrt.html
>
> Even
>

Indeed. Works perfect with the -separate option. My mistake, sorrry.

Anyway, by the way I realise that I can use gdalbuildvrt also for 
mosaics... Which is also what I may need later...

Best,

Patrick