Examples of ucar.nc2.dataset.NetcdfDataset

ucar.nc2.dataset.NetcdfDataset
NetcdfDataset extends the netCDF API, adding standard attribute parsing such as scale and offset, and explicit support for Coordinate Systems. A NetcdfDataset wraps a NetcdfFile, or is defined by an NcML document.

Be sure to close the dataset when done, best practice is to enclose in a try/finally block:
```
 NetcdfDataset ncd = null; try { ncd = NetcdfDataset.openDataset(fileName); ... } finally { ncd.close(); } 
```
By default NetcdfDataset is opened with all enhancements turned on. The default "enhance mode" can be set through setDefaultEnhanceMode(). One can also explicitly set the enhancements you want in the dataset factory methods. The enhancements are:
- ScaleMissing : process scale/offset/missing attributes, and automatically convert the data.
- ScaleMissingDefer : process scale/offset/missing attributes, but dont automatically convert the data. You can call VariableEnhanced.convertScaleOffsetMissing() on the data manually.
- CoordSystem : extract CoordinateSystem using the CoordSysBuilder plug-in mechanism
- ConvertEnums : automaticlly convert enum values to their corresponding Strings. If you want to do this manually, you can call Variable.lookupEnumString() manually.
Automatic ScaleMissing processing has some overhead, and if you need maximum performance, but still want to use scale/offset/missing value handling, open the NetcdfDataset with ScaleMissingDefer. The VariableDS data type is not promoted, and the data is not converted on a read, but you can call the convertScaleOffsetMissing() routines which will do the conversion on a point-by-point basis. @author caron @see ucar.nc2.NetcdfFile

    assert v2 != null;


    Array data = v2.read();
    assert data.getElementType() == int.class;


    NetcdfDataset ncd = TestH5.openH5dataset("support/enum.h5");
    v2 = ncd.findVariable("enum");
    assert v2 != null;


    data = v2.read();
    assert data.getElementType() == String.class;
    ncfile.close();

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    assert v2 != null;


    Array data = v2.read();
    assert data.getElementType() == byte.class;


    NetcdfDataset ncd = NetcdfDataset.openDataset("D:/netcdf4/tst_enum_data.nc");
    v2 = ncd.findVariable("primary_cloud");
    assert v2 != null;


    data = v2.read();
    assert data.getElementType() == String.class;
    ncfile.close();

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        "In which case, you deserve what you get.",
        "  --  Professor Cheng Man-ch'ing"};
    String c_name = "Hello!";


    //H5header.setDebugFlags(new ucar.nc2.util.DebugFlagsImpl("H5header/header"));
    NetcdfDataset ncfile = NetcdfDataset.openDataset(TestH5.testDir + "complex/compound_complex.h5");


    Variable dset = null;
    assert (null != (dset = ncfile.findVariable("CompoundComplex")));
    assert (dset.getDataType() == DataType.STRUCTURE);
    assert (dset.getRank() == 1);
    assert (dset.getSize() == 6);


    Dimension d = dset.getDimension(0);
    assert (d.getLength() == 6);


    Structure s = (Structure) dset;


    // read all with the iterator
    StructureDataIterator iter = s.getStructureIterator();
    while (iter.hasNext()) {
      StructureData sd = (StructureData) iter.next();
      assert sd.getScalarInt("a_name") == a_name;
      a_name++;
      assert sd.getScalarString("c_name").equals(c_name);
      String[] results = sd.getJavaArrayString(sd.findMember("b_name"));
      assert results.length == b_name.length;
      int count = 0;
      for (String r : results)
        assert r.equals(b_name[count++]);


      Iterator viter = sd.getMembers().iterator();
      while (viter.hasNext()) {
        StructureMembers.Member m = (StructureMembers.Member) viter.next();
        Array data = sd.getArray(m);
        NCdump.printArray(data, m.getName(), out, null);
      }
    }


    ncfile.close();
    System.out.println("*** testH5StructureDS ok");


  }

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  }


  public static NetcdfDataset openH5dataset( String filename) {
    try {
      System.out.println("**** Open "+ testDir+filename);
      NetcdfDataset ncfile = NetcdfDataset.openDataset( testDir+filename);
      if (TestH5.dumpFile) System.out.println("open H5 "+ncfile);
      return ncfile;


    } catch (java.io.IOException e) {
      System.out.println(" fail = "+e);

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      measureSize(g.getName(), g, null, false);
  }


  static void testNcd() throws IOException {
    String filename = "C:/data/test2.nc";
    NetcdfDataset ncfile = NetcdfDataset.openDataset(filename);
    measureSize("C:/data/test2.nc", ncfile, null, true);


    NetcdfDatasetInfo info = new NetcdfDatasetInfo(filename);
    measureSize("info", info, null, true);
    String pifo = info.getParseInfo();
    System.out.println("info= " + pifo);
    ncfile.close();
  }

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    ncfile.close();
  }


  static void testNcml() throws IOException {
    String filename = "C:/dev/tds/thredds/cdm/src/test/data/ncml/aggUnionSimple.xml";
    NetcdfDataset ncfile = NetcdfDataset.openDataset(filename, false, null);
    measureSize("aggUnionSimple", ncfile, null, true);
    ncfile.close();
  }

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      }


      byte[] mbytes = scan.getMessageBytesFromLast(m);


      NetcdfFile ncfile = NetcdfFile.openInMemory("test", mbytes);
      NetcdfDataset ncd = new NetcdfDataset(ncfile);


      writeMessage(m, ncd);
      count++;
    }
    raf.close();

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    System.out.println(" testNcmlDatasetWcoords.closed ");
  }


  public void testNcmlDatasetNoCoords() throws IOException, InvalidRangeException {
    String filename = "file:./"+TestNcML.topDir + "aggExistingNoCoords.xml";
    NetcdfDataset ncd = null;


    try {
      ncd = NetcdfDataset.openDataset( filename, true, null);
    } catch (Exception e) {
      //e.printStackTrace();
      assert true;
      return;
    } finally {
      if (ncd != null) ncd.close();
    }
    assert false;
    /*System.out.println(" TestNcmlAggExisting.open "+ filename);


    testDimensions(ncfile);

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  public static void rewrite(String fileIn, String fileOut) throws IOException {
    long start = System.currentTimeMillis();


    // do it in memory for speed
    NetcdfFile ncfile = NetcdfFile.openInMemory(fileIn);
    NetcdfDataset ncd = new NetcdfDataset( ncfile);


    StringBuilder errlog = new StringBuilder();
    StationObsDataset sobs = (StationObsDataset) TypedDatasetFactory.open(FeatureType.STATION, ncd, null, errlog);


    List<ucar.unidata.geoloc.Station> stns = sobs.getStations();

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    <scan location="file:src/test/data/ncml/nc/" suffix="mean.nc"/>
  </aggregation>
  */
  public void testScan() throws IOException {
    String filename = "file:./" + TestNcML.topDir + "aggUnionScan.xml";
    NetcdfDataset scanFile = NetcdfDataset.openDataset(filename, false, null);
    CompareNetcdf.compareFiles(ncfile, scanFile, true, true, false);
    scanFile.close();
  }

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