private void setObs(Message m) {

    java.util.List<ObsBean> beanList = new ArrayList<ObsBean>();
    try {
      NetcdfDataset ncd = getBufrMessageAsDataset(m);
      Variable v = ncd.findVariable(BufrIosp.obsRecord);
      if ((v != null) && (v instanceof Structure)) {
        Structure obs = (Structure) v;
        StructureDataIterator iter = obs.getStructureIterator();
        while (iter.hasNext()) {
          beanList.add(new ObsBean(obs, iter.next()));
        }
      }
    } catch (Exception ex) {
      JOptionPane.showMessageDialog(BufrMessageViewer.this, ex.getMessage());
      ex.printStackTrace();
    }
    obsTable.setBeans(beanList);
  }
    // create from a dataset
    public ObsBean(Structure obs, StructureData sdata) {
      // first choice
      for (Variable v : obs.getVariables()) {
        Attribute att = v.findAttribute("BUFR:TableB_descriptor");
        if (att == null) continue;
        String val = att.getStringValue();
        if (val.equals("0-5-1") && Double.isNaN(lat)) {
          lat = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-6-1") && Double.isNaN(lon)) {
          lon = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-7-30") && Double.isNaN(alt)) {

          alt = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-4-1") && (year < 0)) {
          year = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-4-2") && (month < 0)) {
          month = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-4-3") && (day < 0)) {
          day = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-4-4") && (hour < 0)) {
          hour = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-4-5") && (minute < 0)) {
          minute = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-4-6") && (sec < 0)) {
          sec = sdata.convertScalarInt(v.getShortName());

        } else if (val.equals("0-1-1") && (wmo_block < 0)) {
          wmo_block = sdata.convertScalarInt(v.getShortName());
        } else if (val.equals("0-1-2") && (wmo_id < 0)) {
          wmo_id = sdata.convertScalarInt(v.getShortName());

        } else if ((stn == null)
            && (val.equals("0-1-7")
                || val.equals("0-1-194")
                || val.equals("0-1-11")
                || val.equals("0-1-18"))) {
          if (v.getDataType().isString()) stn = sdata.getScalarString(v.getShortName());
          else stn = Integer.toString(sdata.convertScalarInt(v.getShortName()));
        }
      }

      // second choice
      for (Variable v : obs.getVariables()) {
        Attribute att = v.findAttribute("BUFR:TableB_descriptor");
        if (att == null) continue;
        String val = att.getStringValue();
        if (val.equals("0-5-2") && Double.isNaN(lat)) {
          lat = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-6-2") && Double.isNaN(lon)) {
          lon = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-7-1") && Double.isNaN(alt)) {
          alt = sdata.convertScalarDouble(v.getShortName());
        } else if ((val.equals("0-4-7")) && (sec < 0)) {
          sec = sdata.convertScalarInt(v.getShortName());
        }
      }

      // third choice
      for (Variable v : obs.getVariables()) {
        Attribute att = v.findAttribute("BUFR:TableB_descriptor");
        if (att == null) continue;
        String val = att.getStringValue();
        if (val.equals("0-7-10") && Double.isNaN(alt)) {
          alt = sdata.convertScalarDouble(v.getShortName());
        } else if (val.equals("0-7-2") && Double.isNaN(alt)) {
          alt = sdata.convertScalarDouble(v.getShortName());
        }
      }
    }