Thank you Ethan,
I ended up trying DODSNetcdfFile because it was the only way I could get the
netcdf library to read from nomads.ncdc.noaa.gov/thredds without a Content
Length error, or Range Access error. I was hoping that there was some header
that I could add to my request that would allow me to query the thredds dods
server with these features. The netcdf version which I am using 4.2.20, seems
to only have static method for dods via open(String location, int buffer_size,
ucar.nc2.util.CancelTask cancelTask, Object iospMessage) which nomads at ncdc
doesn't seem to support.
Can netcdf make a query equivilent to
http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111020/ruc2_130_20111020_1300_000.grb2.asc?Temperature[0][2][100][300]
?
Thank You
Jacob Sheck
________________________________________
From: netcdf-java-bounces@xxxxxxxxxxxxxxxx
[netcdf-java-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ethan Davis
[edavis@xxxxxxxxxxxxxxxx]
Sent: Friday, October 21, 2011 12:02 AM
To: netcdf-java@xxxxxxxxxxxxxxxx
Subject: Re: [netcdf-java] Documentation or Direction on defining dimensions of
variables in DODSNetcdfFile
Hi Jake,
Instead of using DODSNetcdfFile directly, try using the
NetcdfFile.open(...) method.
There are some examples of reading data in the NetCDF-Java tutorial:
http://www.unidata.ucar.edu/software/netcdf-java/tutorial/
In particular, see the NetcdfFile section:
http://www.unidata.ucar.edu/software/netcdf-java/tutorial/NetcdfFile.html
which describes a few ways that subsets of data can be read.
Hope that helps,
Ethan
On 10/20/2011 9:17 PM, Jake Sheck wrote:
>
> UCAR NetCDF mail group,
>
> I am working on acquiring small amounts of GFS, NAM and RUC data
> from nomads.ncdc.noaa.gov. As a test I am trying to collect
>Temperature variable for a particular point. I can easily acquire
> this data via my web browser with this link.
>
http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111018/ruc2_130_20111018_1300_000.grb2.asc?Temperature[0][2][100][300]
>
> I would like to collect this variable via the netcdf java library.
> However I can't seem to find documentation on the correct use of the
> dimensions variables in the readSection or readArrays methods of the
> DODSNetcdfFile. Could anyone please direct me to documentation for
> these? I have found that even when I specifiy dimenions for a variable
> it still downloads the complete grid and takes much longer than the link
> above.
>
> Here is an example of what I am trying to do.
>
> String modelFile =
> "http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111018/ruc2_130_20111018_1300_000.grb2";;
> DODSNetcdfFile ncfile = new DODSNetcdfFile( modelFile );
>
> Dimension time = new Dimension("time", 1);
> Dimension pressure = new Dimension("pressure",1);
> Dimension xd = new Dimension("x", 126);
> Dimension yd = new Dimension("y", 557);
>
> List<Dimension> ds = new ArrayList<Dimension>();
> ds.add(time);
> ds.add(pressure);
> ds.add(xd);
> ds.add(yd);
>
> for(Variable v : ncfile.getVariables()){
> if(v.getName.equals("Temperature_height_above_ground"))
> preloadVariables.add(v);
> }
>
>
> List<Array> arrays = ncfile.readArrays( preloadVariables );
>
> Here I get the variable for temperature, but I get the whole set, and
> not a set limited by the dimensions that I set.
>
> Thanks
> Jacob Sheck
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