Hi,
I am a newbie for NetCDF-Java library. I try to use this library in the
Servlet environment to access THREDDS nc aggregation datasets. Here are some
codes I put together:
----------------------------------------------------------------------------
-
Set<Enhance> DATASET_ENHANCEMENTS =EnumSet.of(Enhance.ScaleMissingDefer,
Enhance.CoordSystems);
NetcdfDataset nc=NetcdfDataset.openDataset(
"MY_THREDDS_URL",
DATASET_ENHANCEMENTS,
-1, null,
null
);
List<Variable> l=nc.getVariables();
//close NetcdfDataset before accessing data
nc.close();
Variable vv=null;
for(Variable v:l)
{
if(v.getName().equals("time"))
{
vv=v;
break;
}
}
Array arr;
List<Range> ranges=new ArrayList<Range>();
try {
r = new Range(8759,8759);
ranges.add(r);
arr=vv.read(ranges);
} catch (InvalidRangeException e) {
e.printStackTrace();
}
------------------------------------
Three questions regarding to the codes above:
1. Are the codes above the typical way to access THREDDS data?
2. If yes, it seems OK for reading the data from a variable after
"NetcdfDataset" is closed. Is it valid?
3. If the THREDDS dataset is an archive (static, no update), can I
cache the instance of Variable class as a member variable of the Servlet
class? In other words, are the operations on Variable class thread-safe?
Thanks a lot!
Guan
