public void writeRecord(String stnName, Date obsDate, StructureData sdata) throws IOException {
    StationTracker stnTracker = stationMap.get(stnName);
    ProfileTracker proTracker = stnTracker.profileMap.get(obsDate);

    if (proTracker == null) {
      proTracker = new ProfileTracker(profileIndex);
      stnTracker.profileMap.put(obsDate, proTracker);

      stnTracker.link.add(profileIndex);
      stnTracker.lastChild = profileIndex;
      stnTracker.numChildren++;

      try {
        originTime[0] = profileIndex; // 2d index
        timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
        parentArray.set(0, stnTracker.parent_index);
        ncfile.writeStringData(timeName, originTime, timeArray);
        ncfile.write(parentStationIndex, originTime, parentArray);
      } catch (InvalidRangeException e) {
        e.printStackTrace();
        throw new IllegalStateException(e);
      }

      profileIndex++;
    }

    // needs to be wrapped as an ArrayStructure, even though we are only writing one at a time.
    ArrayStructureW sArray = new ArrayStructureW(sdata.getStructureMembers(), new int[] {1});
    sArray.setStructureData(sdata, 0);

    // track the min and max date
    if ((minDate == null) || minDate.after(obsDate)) minDate = obsDate;
    if ((maxDate == null) || maxDate.before(obsDate)) maxDate = obsDate;

    timeArray.set(0, dateFormatter.toDateTimeStringISO(obsDate));
    parentArray.set(0, proTracker.parent_index);

    proTracker.link.add(recno);
    proTracker.lastChild = recno; // not currently used
    proTracker.numChildren++;

    // write the recno record
    origin[0] = recno; // 1d index
    originTime[0] = recno; // 2d index
    try {
      ncfile.write("record", origin, sArray);
      ncfile.write(parentProfileIndex, originTime, parentArray);
    } catch (InvalidRangeException e) {
      e.printStackTrace();
      throw new IllegalStateException(e);
    }

    recno++;
  }
  /**
   * Getting dataset for a single radar station.
   *
   * @param stnName radar station name
   * @param absTime is absolute time
   * @return RadialDatasetSweep object
   * @throws IOException java io exception
   */
  public RadialDatasetSweep getRadarDataset(String stnName, Date absTime) throws IOException {
    // absTime is a member of  datasetsDateURI
    InvDataset invdata = queryRadarStation(stnName, absTime);

    if (invdata == null) {
      throw new IOException("Invalid time selected: " + absTime.toString() + "\n");
    }

    ThreddsDataFactory tdFactory = new ThreddsDataFactory();
    ThreddsDataFactory.Result result;

    result = tdFactory.openFeatureDataset(invdata, null);

    return (RadialDatasetSweep) result.featureDataset;
  }
  /**
   * Getting URI for a single radar station.
   *
   * @param stnName radar station name
   * @param absTime is absolute time
   * @return URI
   * @throws IOException java io exception
   */
  public URI getRadarDatasetURI(String stnName, Date absTime) throws IOException {
    // absTime is a member of  datasetsDateURI
    InvDataset invdata = queryRadarStation(stnName, absTime);
    /*  List dsets = idata.getDatasets();
    int siz = dsets.size();
    if(siz != 1)
        return null;

    InvDataset invdata = (InvDataset)dsets.get(0);     */
    List acess = invdata.getAccess();
    InvAccess ia = (InvAccess) acess.get(0);
    URI ui = ia.getStandardUri();

    if (ui == null) {
      throw new IOException("Invalid time selected: " + absTime.toString() + "\n");
    }

    return ui;
  }