/**
   * Write a ucar.nc2.ft.PointFeatureCollection in CF point format.
   *
   * @param pfDataset find the first PointFeatureCollection, and write all data from it
   * @param fileOut write to this netcdf-3 file
   * @return number of records written
   * @throws IOException on read/write error, or if no PointFeatureCollection in pfDataset
   */
  public static int writePointFeatureCollection(FeatureDatasetPoint pfDataset, String fileOut)
      throws IOException {
    // extract the PointFeatureCollection
    PointFeatureCollection pointFeatureCollection = null;
    List<FeatureCollection> featureCollectionList = pfDataset.getPointFeatureCollectionList();
    for (FeatureCollection featureCollection : featureCollectionList) {
      if (featureCollection instanceof PointFeatureCollection)
        pointFeatureCollection = (PointFeatureCollection) featureCollection;
    }
    if (null == pointFeatureCollection)
      throw new IOException("There is no PointFeatureCollection in  " + pfDataset.getLocation());

    long start = System.currentTimeMillis();

    FileOutputStream fos = new FileOutputStream(fileOut);
    DataOutputStream out = new DataOutputStream(new BufferedOutputStream(fos, 10000));
    WriterCFPointDataset writer = null;

    /* LOOK BAD
    List<VariableSimpleIF> dataVars = new ArrayList<VariableSimpleIF>();
    ucar.nc2.NetcdfFile ncfile = pfDataset.getNetcdfFile();
    if ((ncfile == null) || !(ncfile instanceof NetcdfDataset))  {
      dataVars.addAll(pfDataset.getDataVariables());
    } else {
      NetcdfDataset ncd = (NetcdfDataset) ncfile;
      for (VariableSimpleIF vs : pfDataset.getDataVariables()) {
        if (ncd.findCoordinateAxis(vs.getName()) == null)
          dataVars.add(vs);
      }
    } */

    int count = 0;
    pointFeatureCollection.resetIteration();
    while (pointFeatureCollection.hasNext()) {
      PointFeature pointFeature = (PointFeature) pointFeatureCollection.next();
      StructureData data = pointFeature.getData();
      if (count == 0) {
        EarthLocation loc =
            pointFeature.getLocation(); // LOOK we dont know this until we see the obs
        String altUnits =
            Double.isNaN(loc.getAltitude()) ? null : "meters"; // LOOK units may be wrong
        writer = new WriterCFPointDataset(out, pfDataset.getGlobalAttributes(), altUnits);
        writer.writeHeader(pfDataset.getDataVariables(), -1);
      }
      writer.writeRecord(pointFeature, data);
      count++;
    }

    writer.finish();
    out.flush();
    out.close();

    long took = System.currentTimeMillis() - start;
    System.out.printf(
        "Write %d records from %s to %s took %d msecs %n",
        count, pfDataset.getLocation(), fileOut, took);
    return count;
  }
  /**
   * Constructor
   *
   * @param stream write to this stream
   * @param globalAtts optional list of global attributes (may be null)
   * @param altUnits optional altitude units (set to null if no altitude variable)
   * @param dataVars the set of data variables: first the double values, then the String values
   * @throws IOException if write error
   */
  public CFPointObWriter(
      DataOutputStream stream,
      List<Attribute> globalAtts,
      String altUnits,
      List<PointObVar> dataVars,
      int numrec)
      throws IOException {
    ncWriter = new WriterCFPointDataset(stream, globalAtts, altUnits);

    List<VariableSimpleIF> vars = new ArrayList<VariableSimpleIF>(dataVars.size());
    for (PointObVar pvar : dataVars) vars.add(new PointObVarAdapter(pvar));

    ncWriter.writeHeader(vars, numrec);
  }
 /**
  * Call this when all done, output is flushed
  *
  * @throws IOException if write error
  */
 public void finish() throws IOException {
   ncWriter.finish();
 }
 /**
  * Add one data point to the file
  *
  * @param lat latitude value in units of degrees_north
  * @param lon longitude value in units of degrees_east
  * @param alt altitude value in units of altUnits (may be NaN)
  * @param time time value as a date
  * @param vals list of data values, matching dataVars in the constructor
  * @param svals list of String values, matching dataVars in the constructor
  * @throws IOException if write error
  */
 public void addPoint(double lat, double lon, double alt, Date time, double[] vals, String[] svals)
     throws IOException {
   ncWriter.writeRecord(lat, lon, alt, time, vals, svals);
 }