[GRASS-user] question about gdal

[Daniel Victoria]

Hi Michael,

Are you sure you should use the -mo flag? Because it looks like that
flag is for setting metadata to the output.

Since gdal considers each time step in a NetCDF dataset a band, have
you tried using the -b switch, for selecting the band you are
interested in?

Cheers
Daniel

On Tue, Jun 12, 2012 at 12:37 AM, Michael Barton <michael.barton at asu.edu> wrote:
> This is a question for any gdal experts out there.
>
> I'm working with reading NetCDF files. gdal does an admirable job of this.
> Many of the NetCDF climate data files have many bands and I'd like import
> only some of them. Specifying a particular NetCDF SUBSET will allow gdal to
> read the data for a particular variable.
>
> For example, ...
>
> gdal_translate
> NETCDF:"/Users/cmbarton/Dropbox/NCAR_files/ppt_A1.SRESA1B_EA1-8.CCSM.atmm.2000-01_cat_2099-12.nc":ppt /Users/cmbarton/Dropbox/NCAR_files/out.tif
>
> ...will translate all of the data sets for the ppt (precipitation) variable
>
> AFAICT, the -mo flag in gdal_translates also allows it to operate on a
> subset of data specified by a metadata option. But I can't figure out the
> proper syntax to use it. There are hints in
> <http://www.gdal.org/frmt_netcdf.html>, but the exact way to specify
> relevant metadata still eludes me. It seems like to translate only the bands
> for which the time variable = 730015.5 days after 1-01-01, I need to run...
>
> gdal_translate -mo ppt#NETCDF_DIMENSION_time=730015.5
> NETCDF:"/Users/cmbarton/Dropbox/NCAR_files/ppt_A1.SRESA1B_EA1-8.CCSM.atmm.2000-01_cat_2099-12.nc":ppt
> /Users/cmbarton/Dropbox/NCAR_files/out.tif
>
> But this ignores the -mo specification and simply translates all bands.
>
> So does anyone know how to specify the metadata for time in this case?
>
> Thanks
> Michael
>
> _____________________
> C. Michael Barton
> Visiting Scientist, Integrated Science Program
> National Center for Atmospheric Research &
> University Consortium for Atmospheric Research
> 303-497-2889 (voice)
>
> Director, Center for Social Dynamics & Complexity
> Professor of Anthropology, School of Human Evolution & Social Change
> Arizona State University
> www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu
>
>
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>
>
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