[netCDFJava #UMY-837124]: reading data into Array from Variable

Greetings John,

Sorry for the delay. It looks like you are closing the netCDF file before you 
try to read in the variable. If you move

makeLatLonGrid(ncfile);

just beneath the netCDF open command, in the`try` block of main, then it works 
great:

'public static void main(String[] args){
'    String filename = "~/20090513-204500.netcdf.gz";
'    NetcdfFile ncfile = null;
'    try {
'        ncfile = NetcdfFile.open(filename);
'        makeLatLonGrid(ncfile);
'    } catch (IOException ioe) {
'        log("trying to open " + filename, ioe);
'    } finally {
'        if (null != ncfile) try {
'            ncfile.close();
'        } catch (IOException ioe) {
'            log("trying to close " + filename, ioe);
'        }
'    }
'}

Cheers!

Sean

> Hi Sean,
> 
> Here is my code. I modified it quite a bit so that it should compile for
> you. I attached the data file as well, if that helps. It's probably
> something simple I'm doing/failing to do. Thanks for your help!
> -John
> 
> *******************
> package edu.ou.asgbook.segmentation;
> 
> import java.io.*;
> import ucar.nc2.*;
> import ucar.ma2.*;
> 
> public class read_netcdf {
> private static void log(String msg, IOException ioe){
> System.out.println(msg + ioe.getMessage());
> }
> private static void makeLatLonGrid(NetcdfFile netcdf){
> Variable var = netcdf.findVariable("goesnp_ctype_emiss11_high");
> System.out.println(var.getUnitsString());
> Array arr = null;
> try {
> arr = var.read();
> } catch (IOException e) {
> log("trying to read the variable. ",e);
> e.printStackTrace();
> }
> }
> public static void main(String[] args){
> String filename = "~/20090513-204500.netcdf.gz";
> NetcdfFile ncfile = null;
> try {
> ncfile = NetcdfFile.open(filename);
> } catch (IOException ioe) {
> log("trying to open " + filename, ioe);
> } finally {
> if (null != ncfile) try {
> ncfile.close();
> } catch (IOException ioe) {
> log("trying to close " + filename, ioe);
> }
> }
> makeLatLonGrid(ncfile);
> }
> }
> 
> *******************
> 
> address@hidden> wrote:
> 
> > Greetings John,
> >
> > Would you mind sending the code you wrote, at least the part where you
> > begin to open the dataset through the point of error?
> >
> > Thanks!
> >
> > Sean
> >
> > > Hello,
> > >
> > > I have the latest version of Java and the NetCDF Java library version
> > 4.2.
> > > I'm simply trying to read in a variable from a netcdf file. I can make a
> > > Variable just fine and extract info (e.g. var name, data type), but then
> > > when I try to make an Array out of it with read(), (e.g. arr = var.read()
> > > ), I get the runtime error, "BAD: missing spi:" then the variable name. I
> > > can get attributes just fine, and the shape and type of the data are
> > what I
> > > expect. I view the data in ncview, and it looks fine. A co-worker loaded
> > it
> > > up in McIDAS - V and the log message said: "ucar.nc2.NetcdfFile - Using
> > > IOSP ucar.nc2.iosp.netcdf3.N3raf" if that's pertinent at all. I think I'm
> > > importing all of the proper libraries since I'm not getting a compiler
> > > error, but I'm fairly new to Java, so there could be something I'm
> > missing.
> > > Any help is much appreciated! Let me know if you'd like more info.
> > >
> > > Thanks,
> > > John
> > >
> > >
> > > --
> > >
> > ---------------------------------------------------------------------------------------
> > > John Cintineo
> > > Research Meteorologist
> > > SSEC/CIMSS
> > > University of Wisconsin -- Madison
> > > 1225 W. Dayton St.
> > > Madison, WI 53706
> > >
> > > (608) 890-0619
> > > john.cintineo@ <address@hidden>ssec.wisc.edu
> > >
> > > "My opinions are my own and not representative of
> > > CIMSS, SSEC, NOAA or any affiliates"
> > >
> > >
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: UMY-837124
> > Department: Support netCDF Java
> > Priority: High
> > Status: Open
> >
> >
> 
> 
> --
> ---------------------------------------------------------------------------------------
> John Cintineo
> Research Meteorologist
> SSEC/CIMSS
> University of Wisconsin -- Madison
> 1225 W. Dayton St.
> Madison, WI 53706
> 
> (608) 890-0619
> john.cintineo@ <address@hidden>ssec.wisc.edu
> 
> "My opinions are my own and not representative of
> CIMSS, SSEC, NOAA or any affiliates"
> 
> 


Ticket Details
===================
Ticket ID: UMY-837124
Department: Support netCDF Java
Priority: Emergency
Status: Open