[gdal-dev] gdalbuilvrt and multiband files

[Etienne Tourigny]

The idea looks pretty cool!

just curious: what happens to georeferencing data (projection and GT)
and metadata when converting to (and from) GTA format?  What is the
status of metadata support in the GDAL driver?

Etienne

On Tue, Dec 6, 2011 at 6:08 PM, Martin Lambers <marlam at marlam.de> wrote:
> Hi Jose!
>
> On Tue, 6 Dec 2011 17:52:17 +0000, Jose Gomez-Dans wrote:
>> I'm trying to build a VRT file out of a number of multiband files
>> using gdalbuildvrt. Let's say I have N 7-band files, and I want build
>> 7 N-band files (i.e., I want to stack all the bands in the same
>> dataset). I have accomplished this thus far by having a prior step
>> that creates a VRT for each individual band, and I then stack them
>> using gdalbuildvrt -separate. However, i was wondering whether
>> there's any more direct way of doing this? I guess that one way would
>> be to build the XML file directly, but I was keen in finding some
>> "shell-fu" way!
>
> This might be slightly offtopic, but if you are using the latest GDAL
> from svn, you could try the brand new GTA driver to store your files
> in GTA format. Then you can use the gta tool, which was made for
> exactly this kind of generic array data manipulation:
>
> # loop over 7 bands, called 'components' in GTA
> for j in `seq 0 6`; do
>  # loop over N input files "in*.gta"
>  for i in `seq 1 N`; do
>    # extract the current component into its own file
>    gta component-extract -k $j < in$i.gta > tmp$i.gta
>  done
>  # merge the extracted components into the output file
>  gta component-merge tmp*.gta > out$j.gta
>  rm tmp*.gta
> done
>
> Not a pure GDAL solution, but plenty of shell-fu :)
>
> Martin
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