Examples of ucar.nc2.dataset.NetcdfDataset$VariableComparator

ucar.nc2.units.DateType
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

public final class NetCDFCRSUtilitiesTest extends Assert {
    @Test
    public void testBuildVerticalCRS() throws IOException {
        final String url = TestData.url(this, "O3-NO2.nc").toExternalForm();


        NetcdfDataset dataset = null;
        try {
            dataset = NetcdfDataset.openDataset(url);
            assertNotNull(dataset);
            final List<CoordinateAxis> cvs = dataset.getCoordinateAxes();
            assertNotNull(cvs);
            assertSame(4, cvs.size());


            CoordinateAxis timeAxis = cvs.get(0);
            assertNotNull(timeAxis);
            assertEquals(AxisType.Time, timeAxis.getAxisType());


            final TemporalCRS temporalCrs = NetCDFCRSUtilities.buildTemporalCrs(timeAxis);
            assertNotNull(temporalCrs);
            assertTrue(temporalCrs instanceof DefaultTemporalCRS);


            CoordinateAxis verticalAxis = cvs.get(1);
            assertNotNull(verticalAxis);
            assertEquals(AxisType.Height, verticalAxis.getAxisType());


            final VerticalCRS verticalCrs = NetCDFCRSUtilities.buildVerticalCrs(verticalAxis);
            assertNotNull(verticalCrs);
            assertTrue(verticalCrs instanceof DefaultVerticalCRS);
        } finally {
            if (dataset != null) {
                dataset.close();
            }
        }
    }

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        // TODO: Add URL & String support.
        if (wrappee != null)
            reset();
        try {
          //open up a dataset and check that it actually is an hdf4
          final NetcdfDataset dataset = NetCDFUtilities.getDataset(input);
          
          // is it open? is it an hdf4?
          if(dataset!=null){
            if(!(dataset.getIosp() instanceof H4iosp))
              throw new IllegalArgumentException("Provided dataset is not an HDF4 file");
          }
          else
            throw new IllegalArgumentException("Provided dataset is not an HDF4 file");

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            input = ((FileImageInputStreamExtImpl) input).getFile();
        }
        // check if this is an 
        if (input instanceof File) {
          // open up as a netcdf dataset
            final NetcdfDataset dataset = NetCDFUtilities.getDataset(input);            
            if (dataset != null) {
              
              // first of all is it an HDF4??
              // TODO change this when we will be allowed to use >= 4.0.46
              if(!(dataset.getIosp() instanceof H4iosp))
                return false;
              
              // now, check if we can read it
              try{
                found = isValidDataset(dataset);
              }
              finally {
                try{
                  dataset.close();
                }
                catch (Throwable e) {
            if(LOGGER.isLoggable(Level.FINE))
              LOGGER.log(Level.FINE,e.getLocalizedMessage(),e);
          }

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        assertEquals("application/x-netcdf", response.getContentType());
        byte[] netcdfOut = getBinary(response);
        File file = File.createTempFile("netcdf", "out.nc", new File("./target"));
        FileUtils.writeByteArrayToFile(file, netcdfOut);
        
        NetcdfDataset dataset = NetcdfDataset.openDataset(file.getAbsolutePath());
        assertNotNull(dataset);
        dataset.close();
    }

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    try
    {
      File dir = new File( getDiskCache().getRootDirectory() );
      File ncFile = File.createTempFile( "WCS", ".nc", dir );


      NetcdfCFWriter writer = new NetcdfCFWriter();
      writer.makeFile( ncFile.getPath(), dataset,
                       Collections.singletonList( identifier ), null, null,
  //                     Collections.singletonList( req.getCoverage() ),
  //                     req.getBoundingBox(), dateRange,
                       true, 1, 1, 1 );
      return ncFile;

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    raf.seek(pos);


    // gini header process
    byte[] buf = new byte[FY_AWX_PIB_LEN];
    int count = raf.read(buf);
    EndianByteBuffer byteBuffer = null;
    if (count == FY_AWX_PIB_LEN) {
      byteBuffer = new EndianByteBuffer(buf);


      this.firstHeader.fillHeader(byteBuffer);


      // if big endian bytes, fill the head with BIG_ENDIAN instead;
      if (this.firstHeader.byteOrder != EndianByteBuffer.LITTLE_ENDIAN) {
        byteBuffer = new EndianByteBuffer(buf, EndianByteBuffer.BIG_ENDIAN);
      }


    } else {
      return false;
    }


    if (!((this.firstHeader.fileName.endsWith(".AWX") || this.firstHeader.fileName.endsWith(".awx"))
            && this.firstHeader.firstHeaderLength == FY_AWX_PIB_LEN)) {
      return false;
    }


    // skip the fills of the first record
    //  raf.seek(FY_AWX_PIB_LEN + this.firstHeader.fillSectionLength);
    buf = new byte[this.firstHeader.secondHeaderLength];
    raf.read(buf);
    byteBuffer = new EndianByteBuffer(buf, this.firstHeader.byteOrder);
    switch (this.firstHeader.typeOfProduct) {
      case AwxFileFirstHeader.AWX_PRODUCT_TYPE_UNDEFINED:
        throw new UnsupportedDatasetException();
      case AwxFileFirstHeader.AWX_PRODUCT_TYPE_GEOSAT_IMAGE:
        secondHeader = new AwxFileGeoSatelliteSecondHeader();

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    taxis.addAttribute( new Attribute(_Coordinate.AxisType, AxisType.Time.toString()));
    double [] tdata = new double[1];
    tdata[0] = cal.getTimeInMillis();
    Array dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[] {1}, tdata);
    taxis.setCachedData( dataA, false);
    DateFormatter formatter = new DateFormatter();
    taxis.addAttribute( new Attribute("units", "msecs since "+formatter.toDateTimeStringISO(new Date(0))));
    ncfile.addVariable(null, taxis);


    //att = new Attribute( "Time", dstring);
    //this.ncfile.addAttribute(null, att);
    this.ncfile.addAttribute(null, new Attribute("time_coverage_start", dstring));

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        taxis.addAttribute(new Attribute(_Coordinate.AxisType, AxisType.Time.toString()));
        double[] tdata = new double[1];
        tdata[0] = cal.getTimeInMillis();
        Array dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{1}, tdata);
        taxis.setCachedData(dataA, false);
        DateFormatter formatter = new DateFormatter();
        taxis.addAttribute(new Attribute("units", "msecs since " + formatter.toDateTimeStringISO(new Date(0))));
        ncfile.addVariable(null, taxis);
        //  Get dimensions
        Integer ni = new Integer(geoSatelliteSecondHeader.widthOfImage);
        att = new Attribute("NX", ni);
        this.ncfile.addAttribute(null, att);


        ni = new Integer(geoSatelliteSecondHeader.heightOfImage);
        att = new Attribute("NY", ni);
        this.ncfile.addAttribute(null, att);


        vname = getGeoSatelliteProductName(geoSatelliteSecondHeader.channel);
        if (vname == null)
          throw new UnsupportedDatasetException("Unsupported GeoSatellite Procuct Dataset");




        // set projection attribute
        // ? which projection
        ProjectionImpl projection = null;
        double dxKm = 0.0, dyKm = 0.0;
        short nv = geoSatelliteSecondHeader.flagOfProjection;
        att = new Attribute("ProjIndex", nv);
        this.ncfile.addAttribute(null, att);
        int proj = nv;
        if (proj == 2) {
          att = new Attribute("ProjName", "MERCATOR");
          double lat0 = geoSatelliteSecondHeader.centerLatitudeOfProjection;
          double lon0 = geoSatelliteSecondHeader.centerLongitudeOfProjection;
          double par = geoSatelliteSecondHeader.standardLatitude1;
          dxKm = geoSatelliteSecondHeader.horizontalResolution;
          dyKm = geoSatelliteSecondHeader.verticalResolution;
          projection = new Mercator(lon0, par);
        } else if (proj == 1) {
          att = new Attribute("ProjName", "LAMBERT_CONFORNAL");
          double lat0 = geoSatelliteSecondHeader.centerLatitudeOfProjection;
          double lon0 = geoSatelliteSecondHeader.centerLongitudeOfProjection;
          double par1 = geoSatelliteSecondHeader.standardLatitude1;
          double par2 = geoSatelliteSecondHeader.standardLatitude2;
          dxKm = geoSatelliteSecondHeader.horizontalResolution / 100;
          dyKm = geoSatelliteSecondHeader.verticalResolution / 100;
          projection = new LambertConformal(lat0, lon0, par1, par2);
        } else if (proj == 3) {
          att = new Attribute("ProjName", "POLARSTEREOGRAPHIC");
          double latt = geoSatelliteSecondHeader.centerLatitudeOfProjection;
          double lont = geoSatelliteSecondHeader.centerLongitudeOfProjection;
          double scale = (1. + Math.sin(DEG_TO_RAD * latt)) / 2.;
          dxKm = geoSatelliteSecondHeader.horizontalResolution;
          dyKm = geoSatelliteSecondHeader.verticalResolution;
          projection = new Stereographic(90.0, lont, scale);
        } else if (proj == 4) {
          att = new Attribute("ProjName", "LatLonProjection");
          projection = new LatLonProjection();
        }
        this.ncfile.addAttribute(null, att);


        // coordinate transform variable
        if (proj != 4) {


        }
        //double dxKm = 0.0, dyKm = 0.0, latin, lonProjectionOrigin ;


        // deal with projection




        this.ncfile.addAttribute(null, new Attribute("channel", geoSatelliteSecondHeader.channel));


        this.ncfile.addAttribute(null, new Attribute("geospatial_lat_min", new Float(geoSatelliteSecondHeader.latitudeOfSouth)));
        this.ncfile.addAttribute(null, new Attribute("geospatial_lat_max", new Float(geoSatelliteSecondHeader.latitudeOfNorth)));
        this.ncfile.addAttribute(null, new Attribute("geospatial_lon_min", new Float(geoSatelliteSecondHeader.longitudeOfWest)));
        this.ncfile.addAttribute(null, new Attribute("geospatial_lon_max", new Float(geoSatelliteSecondHeader.longitudeOfEast)));
        this.ncfile.addAttribute(null, new Attribute("geospatial_vertical_min", new Float(0.0)));
        this.ncfile.addAttribute(null, new Attribute("geospatial_vertical_max", new Float(0.0)));




        this.ncfile.addAttribute(null, new Attribute("sample_ratio", geoSatelliteSecondHeader.sampleRatio));




        att = new Attribute("horizontal_resolution", geoSatelliteSecondHeader.horizontalResolution);
        this.ncfile.addAttribute(null, att);
        att = new Attribute("vertical_resolution", geoSatelliteSecondHeader.verticalResolution);
        this.ncfile.addAttribute(null, att);




        // only one data variable per awx file


        //  set vname and units according to grid feature


        Variable var = new Variable(ncfile, ncfile.getRootGroup(), null, vname);


        var.addAttribute(new Attribute("long_name", vname));


        // get dimensions
        int velems;
        boolean isRecord = false;




        int nx = geoSatelliteSecondHeader.widthOfImage;
        int ny = geoSatelliteSecondHeader.heightOfImage;




        Dimension dimX;
        Dimension dimY;


        if (proj != 4) {
          dimX = new Dimension("x", nx, true, false, false);
          dimY = new Dimension("y", ny, true, false, false);
        } else {
          dimX = new Dimension("lon", nx, true, false, false);
          dimY = new Dimension("lat", ny, true, false, false);
        }


        ncfile.addDimension(null, dimY);
        ncfile.addDimension(null, dimX);


        int byteAmountofData = 1;
        velems = dimX.getLength() * dimY.getLength() * byteAmountofData;
        ArrayList dims = new ArrayList();
        dims.add(dimT);
        dims.add(dimY);
        dims.add(dimX);




        var.setDimensions(dims);


        // data type
        Class dataType = null;
        switch (byteAmountofData) {
          case 1:
            var.setDataType(DataType.BYTE);
            dataType = DataType.BYTE.getPrimitiveClassType();
            break;
          case 2:
            var.setDataType(DataType.SHORT);
            dataType = DataType.SHORT.getPrimitiveClassType();
            break;
          case 4:
            var.setDataType(DataType.INT);
            dataType = DataType.INT.getPrimitiveClassType();
            break;
          default:
            System.out.println("Unsupported Grid Procuct Dataset!");
            throw new UnsupportedDatasetException("Unsupported Grid Procuct Dataset");


        }


        var.addAttribute(new Attribute("coordinates", "Lon Lat"));


        var.addAttribute(new Attribute("_unsigned", "true"));
        var.addAttribute(new Attribute("units", "percent"));
        // if(var.getDataType() == DataType.BYTE) {
        //     var.addAttribute(new Attribute("_missing_value", new Byte((byte)-1)));
        //     var.addAttribute( new Attribute("scale_factor", new Byte((byte)(1))));
        //     var.addAttribute( new Attribute("add_offset", new Byte((byte)(0))));
        //  } else {
        var.addAttribute(new Attribute("_missing_value", new Short((short) -1)));
        var.addAttribute(new Attribute("scale_factor", new Short((short) (1))));
        var.addAttribute(new Attribute("add_offset", new Short((short) (0))));
        //  }


        // size and beginning data position in file
        int vsize = velems;
        long begin = this.firstHeader.recordsOfHeader * this.firstHeader.recoderLength;
        if (debug)
          log.warn(" name= " + vname + " vsize=" + vsize + " velems=" + velems + " begin= " + begin + " isRecord=" + isRecord + "\n");
        var.setSPobject(new Vinfo(vsize, begin, isRecord, nx, ny, dataType, this.firstHeader.byteOrder));
        String coordinates;
        if (proj != 4) {
          coordinates = "x y time";
        } else {
          coordinates = "Lon Lat time";
        }


        var.addAttribute(new Attribute(_Coordinate.Axes, coordinates));


        ncfile.addVariable(ncfile.getRootGroup(), var);




//          if (debug) System.out.println("start at proj coord "+start);


        LatLonPointImpl startPnt = new LatLonPointImpl(geoSatelliteSecondHeader.latitudeOfNorth, geoSatelliteSecondHeader.longitudeOfWest);
        LatLonPointImpl endPnt = new LatLonPointImpl(geoSatelliteSecondHeader.latitudeOfSouth, geoSatelliteSecondHeader.longitudeOfEast);
        if (debug) System.out.println("start at geo coord :" + startPnt);


        if (proj != 4) {
          // we have to project in order to find the origin
          ProjectionPointImpl start = (ProjectionPointImpl) projection.latLonToProj(
                  new LatLonPointImpl(geoSatelliteSecondHeader.latitudeOfSouth,
                          geoSatelliteSecondHeader.longitudeOfWest));
          double startx = start.getX();
          double starty = start.getY();


          Variable xaxis = new Variable(ncfile, null, null, "x");
          xaxis.setDataType(DataType.DOUBLE);
          xaxis.setDimensions("x");
          xaxis.addAttribute(new Attribute("long_name", "projection x coordinate"));
          xaxis.addAttribute(new Attribute("units", "km"));
          xaxis.addAttribute(new Attribute(_Coordinate.AxisType, "GeoX"));
          double[] data = new double[nx];
          if (proj == 2) {
            double lon_1 = geoSatelliteSecondHeader.longitudeOfEast;
            double lon_2 = geoSatelliteSecondHeader.longitudeOfWest;
            if (lon_1 < 0) lon_1 += 360.0;
            if (lon_2 < 0) lon_2 += 360.0;
            double dx = (lon_1 - lon_2) / (nx - 1);


            for (int i = 0; i < data.length; i++) {
              double ln = lon_2 + i * dx;
              ProjectionPointImpl pt = (ProjectionPointImpl) projection.latLonToProj(
                      new LatLonPointImpl(geoSatelliteSecondHeader.latitudeOfSouth, ln));
              data[i] = pt.getX();  // startx + i*dx;
            }
          } else {
            for (int i = 0; i < data.length; i++)
              data[i] = startx + i * dxKm;
          }


          dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{nx}, data);
          xaxis.setCachedData(dataA, false);
          ncfile.addVariable(null, xaxis);


          Variable yaxis = new Variable(ncfile, null, null, "y");
          yaxis.setDataType(DataType.DOUBLE);
          yaxis.setDimensions("y");
          yaxis.addAttribute(new Attribute("long_name", "projection y coordinate"));
          yaxis.addAttribute(new Attribute("units", "km"));
          yaxis.addAttribute(new Attribute(_Coordinate.AxisType, "GeoY"));
          data = new double[ny];
          double endy = starty + dyKm * (data.length - 1); // apparently lat1,lon1 is always the lower ledt, but data is upper left
          double lat2 = geoSatelliteSecondHeader.latitudeOfNorth;
          double lat1 = geoSatelliteSecondHeader.latitudeOfSouth;
          if (proj == 2) {
            double dy = (lat2 - lat1) / (ny - 1);
            for (int i = 0; i < data.length; i++) {
              double la = lat2 - i * dy;
              ProjectionPointImpl pt = (ProjectionPointImpl) projection.latLonToProj(
                      new LatLonPointImpl(la, geoSatelliteSecondHeader.longitudeOfWest));
              data[i] = pt.getY();  //endyy - i*dy;
            }
          } else {
            for (int i = 0; i < data.length; i++)
              data[i] = endy - i * dyKm;
          }
          dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{ny}, data);
          yaxis.setCachedData(dataA, false);
          ncfile.addVariable(null, yaxis);


          // coordinate transform variable
          Variable ct = new Variable(ncfile, null, null, projection.getClassName());
          ct.setDataType(DataType.CHAR);
          ct.setDimensions("");
          List params = projection.getProjectionParameters();
          for (int i = 0; i < params.size(); i++) {
            Parameter p = (Parameter) params.get(i);
            ct.addAttribute(new Attribute(p));
          }
          ct.addAttribute(new Attribute(_Coordinate.TransformType, "Projection"));
          ct.addAttribute(new Attribute(_Coordinate.Axes, "x, y"));
          // fake data
          dataA = Array.factory(DataType.CHAR.getPrimitiveClassType(), new int[]{});
          dataA.setChar(dataA.getIndex(), ' ');
          ct.setCachedData(dataA, false);


          ncfile.addVariable(null, ct);
          ncfile.addAttribute(null, new Attribute("Conventions", _Coordinate.Convention));
        } else {
          Variable yaxis = new Variable(ncfile, null, null, "lat");
          yaxis.setDataType(DataType.DOUBLE);
          yaxis.setDimensions("lat");
          yaxis.addAttribute(new Attribute("long_name", "latitude"));
          yaxis.addAttribute(new Attribute("units", "degree"));
          yaxis.addAttribute(new Attribute(_Coordinate.AxisType, "Lat"));
          double[] data = new double[ny];


          double dy = (endPnt.getLatitude() - startPnt.getLatitude()) / (ny - 1);
          for (int i = 0; i < data.length; i++) {
            data[i] = startPnt.getLatitude() + i * dy; // starty + i*dy;
          }


          dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{ny}, data);
          yaxis.setCachedData(dataA, false);
          ncfile.addVariable(null, yaxis);




          // create coordinate variables
          Variable xaxis = new Variable(ncfile, null, null, "lon");
          xaxis.setDataType(DataType.DOUBLE);
          xaxis.setDimensions("lon");
          xaxis.addAttribute(new Attribute("long_name", "longitude"));
          xaxis.addAttribute(new Attribute("units", "degree"));
          xaxis.addAttribute(new Attribute(_Coordinate.AxisType, "Lon"));
          data = new double[nx];


          double dx = (endPnt.getLongitude() - startPnt.getLongitude()) / (nx - 1);
          for (int i = 0; i < data.length; i++) {
            data[i] = startPnt.getLongitude() + i * dx; // startx + i*dx;


          }


          dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{nx}, data);
          xaxis.setCachedData(dataA, false);
          ncfile.addVariable(null, xaxis);
        }
        break;
      }
      case AwxFileFirstHeader.AWX_PRODUCT_TYPE_POLARSAT_IMAGE:
        throw new UnsupportedDatasetException();


      case AwxFileFirstHeader.AWX_PRODUCT_TYPE_GRID: {
        AwxFileGridProductSecondHeader gridprocuctSecondHeader = (AwxFileGridProductSecondHeader) this.secondHeader;




        att = new Attribute("satellite_name", gridprocuctSecondHeader.satelliteName);
        this.ncfile.addAttribute(null, att);


        att = new Attribute("grid_feature", gridprocuctSecondHeader.gridFeature);
        this.ncfile.addAttribute(null, att);


        att = new Attribute("byte_amount_of_data", gridprocuctSecondHeader.byteAmountofData);
        this.ncfile.addAttribute(null, att);


        att = new Attribute("data_scale", gridprocuctSecondHeader.dataScale);
        this.ncfile.addAttribute(null, att);


        //        this.ncfile.addAttribute(null, new Attribute("cdm_data_type", thredds.catalog.DataType.GRID.toString()));


        DateFormat dformat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
        dformat.setTimeZone(java.util.TimeZone.getTimeZone("GMT"));
        Calendar cal = Calendar.getInstance();
        cal.set(gridprocuctSecondHeader.startYear,
                gridprocuctSecondHeader.startMonth - 1,
                gridprocuctSecondHeader.startDay,
                gridprocuctSecondHeader.startHour,
                gridprocuctSecondHeader.startMinute, 0);
        cal.setTimeZone(java.util.TimeZone.getTimeZone("GMT"));
        String dstring = dformat.format(cal.getTime());
        this.ncfile.addAttribute(null, new Attribute("time_coverage_start", dstring));
        int nz = 1;
        Dimension dimT = new Dimension("time", nz, true, false, false);
        ncfile.addDimension(null, dimT);


        // set time variable with time_coverage_start
        String timeCoordName = "time";
        Variable taxis = new Variable(ncfile, null, null, timeCoordName);
        taxis.setDataType(DataType.DOUBLE);
        taxis.setDimensions("time");
        taxis.addAttribute(new Attribute("long_name", "time since base date"));
        taxis.addAttribute(new Attribute(_Coordinate.AxisType, AxisType.Time.toString()));
        double[] tdata = new double[1];
        tdata[0] = cal.getTimeInMillis();
        Array dataA = Array.factory(DataType.DOUBLE.getPrimitiveClassType(), new int[]{1}, tdata);
        taxis.setCachedData(dataA, false);
        DateFormatter formatter = new DateFormatter();
        taxis.addAttribute(new Attribute("units", "msecs since " + formatter.toDateTimeStringISO(new Date(0))));
        ncfile.addVariable(null, taxis);




        cal.set(gridprocuctSecondHeader.endYear,
                gridprocuctSecondHeader.endMonth - 1,

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  }


  public void augmentDataset(NetcdfDataset ds, CancelTask cancelTask) throws IOException {
    String start_date = ds.findAttValueIgnoreCase(null, "start_date", null);
    SimpleDateFormat df = new SimpleDateFormat("yyyy.DDD.HH.mm.ss");   // "2006.105.00.00.00"
    DateFormatter dfo = new DateFormatter();


    Date start = null;
    try {
      start = df.parse(start_date);
    } catch (ParseException e) {
      throw new RuntimeException("Cant read start_date="+start_date);
    }


    Variable v = ds.findVariable("time_offset");
    v.addAttribute(new Attribute( "units", "seconds since "+dfo.toDateTimeString(start)));


    Group root = ds.getRootGroup();
    root.addAttribute(new Attribute( "Convention", "Suomi-Station-CDM"));    
    ds.finish();
  }

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    Attribute versionAtt = startElement.getAttributeByName( CatalogElementNames.CatalogElement_Version );
    String versionString = versionAtt != null ? versionAtt.getValue() : null;
    Attribute expiresAtt = startElement.getAttributeByName( CatalogElementNames.CatalogElement_Expires );
    String expiresString = expiresAtt != null ? expiresAtt.getValue() : null;
    DateType expires = null;
    try {
      expires = expiresString != null ? new DateType( expiresString, null, null ) : null;
    }
    catch ( ParseException e )
    {
      String msg = "Failed to parse catalog expires date [" + expiresString + "].";
      ThreddsXmlParserIssue issue = StaxThreddsXmlParserUtils.createIssueForException( msg, this.reader, e );
      log.warn( "parseStartElement(): " + issue.getMessage(), e );
      // ToDo Gather issues rather than throw exception.
      throw new ThreddsXmlParserException( issue );
    }
    Attribute lastModifiedAtt = startElement.getAttributeByName( CatalogElementNames.CatalogElement_LastModified );
    String lastModifiedString = lastModifiedAtt != null ? lastModifiedAtt.getValue() : null;
    DateType lastModified = null;
    try {
      lastModified = lastModifiedString != null ? new DateType( lastModifiedString, null, null ) : null;
    }
    catch ( ParseException e )
    {
      String msg = "Failed to parse catalog lastModified date [" + lastModifiedString + "].";
      ThreddsXmlParserIssue issue = StaxThreddsXmlParserUtils.createIssueForException( msg, this.reader, e );

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