Hi Jake:
Look at
http://www.unidata.ucar.edu/software/netcdf-java/tutorial/NetcdfFile.html
http://www.unidata.ucar.edu/software/netcdf-java/tutorial/NetcdfDataset.html
especially the "Reading Data" in the first.
The only difference for opendap is using NetcdfDataset.openFile()
instead of NetcdfFile.open(), eg:
NetcdfDataset.openFile("http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111018/ruc2_130_20111018_1300_000.grb2";,
null);
John
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 the 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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