[gdal-dev] [EXTERNAL] /vsicurl/ and gz files

[Eli Adam]

There is also more info on the wiki,
http://trac.osgeo.org/gdal/wiki/UserDocs/ReadInZip

Best Regards, Eli

On Thu, Oct 10, 2013 at 11:56 AM, Smith, Michael ERDC-RDE-CRREL-NH
<Michael.Smith at erdc.dren.mil> wrote:
> Jose,
>
> You can use /vsigzip/ with /vsicurl
>
> Try
>
> gdalinfo
> /vsigzip/vsicurl/http://www.globalbedo.org/GlobAlbedo29/tiles/2004/h17v04/GlobAlbedo.2004001.h17v04.nc.gz
>
> Mike
>
> --
> Michael Smith
> Remote Sensing/GIS Center
> US Army Corps of Engineers
>
> From: Jose Gomez-Dans <jgomezdans at gmail.com>
> Date: Thursday, October 10, 2013 2:33 PM
> To: gdal-dev <gdal-dev at lists.osgeo.org>
> Subject: [EXTERNAL] [gdal-dev] /vsicurl/ and gz files
> Resent-From: Michael Smith <michael.smith at usace.army.mil>
>
> Hi,
>
> I was wondering if it's possible to use /vsitar/ to have a peek in .gz
> files, such as this one:
> http://www.globalbedo.org/GlobAlbedo29/tiles/2004/h17v04/GlobAlbedo.2004001.h17v04.nc.gz
>
> The file is a NetCDF, with 20 different layers. I was hoping to be able to
> read the file in using /vsitar/ (actually, combining /vsicurl/ and
> /vsitar/), but using e.g. /vsitar/GlobAlbedo.2004001.h17v04.nc.gz I get:
>
> $ gdalinfo /vsitar/GlobAlbedo.2004129.h17v04.nc.gz
> ERROR 4: `/vsitar/GlobAlbedo.2004129.h17v04.nc.gz' does not exist in the
> file system,
> and is not recognised as a supported dataset name.
>
> gdalinfo failed - unable to open '/vsitar/GlobAlbedo.2004129.h17v04.nc.gz'.
> GDAL: In GDALDestroy - unloading GDAL shared library.
>
> I also get failures when I try to open remote sample netcdf files using
> /vsicurl/:
>
> $ gdalinfo
> /vsicurl/http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc
> VSICURL:
> GetFileSize(http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc)=2949152
> response_code=200
> VSICURL:
> GetFileList(/vsicurl/http://www.unidata.ucar.edu/software/netcdf/examples)
> VSICURL: Downloading 0-16383
> (http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc)...
> VSICURL: Got reponse_code=206
> GDAL_netCDF:
> =====
> calling nc_open(
> /vsicurl/http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc
> )
> ERROR 1: netcdf error #-33 : NetCDF: Not a valid ID .
> at (netcdfdataset.cpp,~netCDFDataset,1446)
>
> GDAL:
> GDALClose(/vsicurl/http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc,
> this=0x1e2ca40)
> gdalinfo failed - unable to open
> '/vsicurl/http://www.unidata.ucar.edu/software/netcdf/examples/tos_O1_2001-2002.nc'.
> GDAL: In GDALDestroy - unloading GDAL shared library.
>
> Questions:
> 1.- Do gzipped files work with /vsitar/?
> 2.- Are remote/compressed netcdf files useable with GDAL?
> 3.- How do you select a particular layer if the answer to (2) is yes?
>
> Thanks for your time!
> Jose
>
>
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