[gdal-dev] Reading a NetCDF file with python (not recognised as a supported dataset name

[Kyle Shannon]

Command line works fine.  I didn't have time to test well though.  I will
try to get on a windows machine and download tamas package and give it
another shot.

kss

On Fri, Jun 8, 2012 at 9:31 AM, Etienne Tourigny <etourigny.dev at gmail.com>wrote:

> with commandline and/or python?
>
> I can do both fine using gdal-1.9.1 from osgeo4w (32bit), haven't
> tried Tamas' build yet
>
> On Fri, Jun 8, 2012 at 12:08 PM, Kyle Shannon <KShannon at gcs-research.com>
> wrote:
> > Etienne, Rutger,
> > I can reproduce on windows with 32 bit 1.9 branch and 1.9.1 from Tamas'
> site.  In fact, I couldn't open any datasets.
> >
> > kss
> >
> > -----Original Message-----
> > From: gdal-dev-bounces at lists.osgeo.org [mailto:
> gdal-dev-bounces at lists.osgeo.org] On Behalf Of Etienne Tourigny
> > Sent: Friday, June 08, 2012 9:10 AM
> > To: Rutger
> > Cc: gdal-dev at lists.osgeo.org
> > Subject: Re: [gdal-dev] Reading a NetCDF file with python (not
> recognised as a supported dataset name
> >
> > Rutger,
> >
> > There should not be any difference when using the python bindings. If
> gdalinfo can read it the python bindings should also.
> >
> > I cannot reproduce your problem using gdal-1.9.1 under linux.  Which
> exact version are you using?
> >
> > By the way, the vrtfile in unnecessary, because GDAL's Open accepts the
> NETCDF:file.nc:variable syntax.
> >
> > Try adding this to your script and send the result back here
> gdal.SetConfigOption( 'CPL_DEBUG', 'ON' )
> >
> > also try gdal_info.exe -stats
> >
> NETCDF:LPRM-TMI_L3_DY_SOILM3_V001-20120411T144114Z_20120102.nc:soil_moisture_x
> > this actually reads the file contents and not just the metadata. If it
> fails then something is wrong.
> >
> > you should see
> >    STATISTICS_MAXIMUM=99
> >    STATISTICS_MEAN=21.746993313128
> >    STATISTICS_MINIMUM=0
> >    STATISTICS_STDDEV=20.100893016522
> >
> >
> > Etienne
> >
> > On Fri, Jun 8, 2012 at 9:00 AM, Rutger <kassies at gmail.com> wrote:
> >> Dear list,
> >>
> >> I am trying to open a NetCDF file with the Python bindings. My GDAL
> >> 1.9 build (Win32 from Tamas) shows the NetCDF driver when i run
> >> "gdalinfo --formats", so it should be possible.
> >>
> >> When using the pre-build command-line utilities all works well. But
> >> when i move to Python i get the message:
> >> /" ... does not exist in the file system, and is not recognised as a
> >> supported dataset name."/ I dont have the slightest clue about what
> >> i'm doing wrong.
> >>
> >> I have simplified the problem to 3 steps:
> >> 1. Use gdal_translate to select a subdataset and output to VRT 2. Read
> >> the VRT in Python with gdal.Open() 3. Use gdal_translate to convert
> >> the VRT to a Geotiff
> >>
> >> Step 1 & 3 work well, but 2 fails. Is there some limitation of the
> >> Python bindings regarding NetCDF? The script runs fine if i replace
> >> the NetCDF with a Geotiff file.
> >>
> >> Any help would be appreciated.
> >>
> >> An example NetCDF i used can be found at:
> >> ftp://hydro1.sci.gsfc.nasa.gov/data/s4pa/WAOB/LPRM_TMI_DY_SOILM3.001/2
> >> 012/05/
> >> ftp://hydro1.sci.gsfc.nasa.gov/data/s4pa/WAOB/LPRM_TMI_DY_SOILM3.001/2
> >> 012/05/
> >>
> >> Below is the Python script i have used for exploring the issue:
> >>
> >> import os
> >> try:
> >>    from osgeo import gdal
> >> except ImportError:
> >>    import gdal
> >>
> >> netcdffile =
> >>
> "NETCDF:LPRM-TMI_L3_DY_SOILM3_V001-20120411T144114Z_20120102.nc:soil_moisture_x"
> >> vrtfile = "LPRM-TMI_L3_DY_SOILM3_V001-20120411T144114Z_20120102.vrt"
> >> tiffile = "LPRM-TMI_L3_DY_SOILM3_V001-20120411T144114Z_20120102.tif"
> >>
> >> # 1: convert the netcdf to vrt externally (works well)
> >> os.system('gdal_translate -of "VRT" ' + netcdffile + ' ' + vrtfile)
> >>
> >> # 2: try to open the vrt in Python (fails at .ReadAsArray) dsin =
> >> gdal.Open(vrtfile)
> >>
> >> if not dsin is None:
> >>  indata = dsin.ReadAsArray(0, 0, dsin.RasterXSize, dsin.RasterYSize)
> >>
> >> # 3: convert the same vrt to a tif externally (works well)
> >> os.system('gdal_translate ' + vrtfile + ' ' + tiffile)
> >>
> >>
> >> Regards,
> >> Rutger
> >>
> >>
> >> --
> >> View this message in context:
> >> http://osgeo-org.1560.n6.nabble.com/Reading-a-NetCDF-file-with-python-
> >> not-recognised-as-a-supported-dataset-name-tp4979943.html
> >> Sent from the GDAL - Dev mailing list archive at Nabble.com.
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