[gdal-dev] /vsicurl/ and gz files

[Jose Gomez-Dans]

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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