private void determineProductDimensions(final MetadataElement absRoot) throws IOException {
    int totalWidth = 0, maxHeight = 0, k = 0;
    String pol = null;
    for (Map.Entry<String, ImageIOFile> stringImageIOFileEntry : bandImageFileMap.entrySet()) {
      final ImageIOFile img = stringImageIOFileEntry.getValue();
      final String imgName = img.getName().toLowerCase();
      final String bandMetadataName = imgBandMetadataMap.get(imgName);
      if (bandMetadataName == null) {
        throw new IOException("Metadata for measurement dataset " + imgName + " not found");
      }

      if (k == 0) {
        pol = bandMetadataName.substring(bandMetadataName.lastIndexOf("_") + 1);
      } else if (!bandMetadataName.substring(bandMetadataName.lastIndexOf("_") + 1).equals(pol)) {
        continue;
      }
      k++;

      final MetadataElement bandMetadata = absRoot.getElement(bandMetadataName);
      int width = bandMetadata.getAttributeInt(AbstractMetadata.num_samples_per_line);
      int height = bandMetadata.getAttributeInt(AbstractMetadata.num_output_lines);
      totalWidth += width;
      if (height > maxHeight) {
        maxHeight = height;
      }
    }

    if (isSLC() && isTOPSAR()) { // approximate does not account for overlap
      absRoot.setAttributeInt(AbstractMetadata.num_samples_per_line, totalWidth);
      absRoot.setAttributeInt(AbstractMetadata.num_output_lines, maxHeight);
    }
  }
  @Override
  public Product createProduct() throws IOException {

    final MetadataElement newRoot = addMetaData();
    findImages();

    final MetadataElement absRoot = newRoot.getElement(AbstractMetadata.ABSTRACT_METADATA_ROOT);
    determineProductDimensions(absRoot);

    final int sceneWidth = absRoot.getAttributeInt(AbstractMetadata.num_samples_per_line);
    final int sceneHeight = absRoot.getAttributeInt(AbstractMetadata.num_output_lines);

    final Product product =
        new Product(getProductName(), getProductType(), sceneWidth, sceneHeight);
    updateProduct(product, newRoot);

    addBands(product);
    addGeoCoding(product);

    product.setName(getProductName());
    // product.setProductType(getProductType());
    product.setDescription(getProductDescription());

    ReaderUtils.addMetadataProductSize(product);

    return product;
  }
  private void addBandAbstractedMetadata(
      final MetadataElement absRoot, final MetadataElement origProdRoot) throws IOException {

    MetadataElement annotationElement = origProdRoot.getElement("annotation");
    if (annotationElement == null) {
      annotationElement = new MetadataElement("annotation");
      origProdRoot.addElement(annotationElement);
    }

    // collect range and azimuth spacing
    double rangeSpacingTotal = 0;
    double azimuthSpacingTotal = 0;
    boolean commonMetadataRetrieved = false;

    double heightSum = 0.0;

    int numBands = 0;
    final String annotFolder = getRootFolder() + "annotation";
    final String[] filenames = listFiles(annotFolder);
    if (filenames != null) {
      for (String metadataFile : filenames) {

        final Document xmlDoc =
            XMLSupport.LoadXML(getInputStream(annotFolder + '/' + metadataFile));
        final Element rootElement = xmlDoc.getRootElement();
        final MetadataElement nameElem = new MetadataElement(metadataFile);
        annotationElement.addElement(nameElem);
        AbstractMetadataIO.AddXMLMetadata(rootElement, nameElem);

        final MetadataElement prodElem = nameElem.getElement("product");
        final MetadataElement adsHeader = prodElem.getElement("adsHeader");

        final String swath = adsHeader.getAttributeString("swath");
        final String pol = adsHeader.getAttributeString("polarisation");

        final ProductData.UTC startTime = getTime(adsHeader, "startTime");
        final ProductData.UTC stopTime = getTime(adsHeader, "stopTime");

        final String bandRootName = AbstractMetadata.BAND_PREFIX + swath + '_' + pol;
        final MetadataElement bandAbsRoot =
            AbstractMetadata.addBandAbstractedMetadata(absRoot, bandRootName);
        final String imgName = FileUtils.exchangeExtension(metadataFile, ".tiff");
        imgBandMetadataMap.put(imgName, bandRootName);

        AbstractMetadata.setAttribute(bandAbsRoot, AbstractMetadata.SWATH, swath);
        AbstractMetadata.setAttribute(bandAbsRoot, AbstractMetadata.polarization, pol);
        AbstractMetadata.setAttribute(bandAbsRoot, AbstractMetadata.annotation, metadataFile);
        AbstractMetadata.setAttribute(bandAbsRoot, AbstractMetadata.first_line_time, startTime);
        AbstractMetadata.setAttribute(bandAbsRoot, AbstractMetadata.last_line_time, stopTime);

        if (AbstractMetadata.isNoData(absRoot, AbstractMetadata.mds1_tx_rx_polar)) {
          AbstractMetadata.setAttribute(absRoot, AbstractMetadata.mds1_tx_rx_polar, pol);
        } else {
          AbstractMetadata.setAttribute(absRoot, AbstractMetadata.mds2_tx_rx_polar, pol);
        }

        final MetadataElement imageAnnotation = prodElem.getElement("imageAnnotation");
        final MetadataElement imageInformation = imageAnnotation.getElement("imageInformation");

        AbstractMetadata.setAttribute(
            absRoot,
            AbstractMetadata.data_take_id,
            Integer.parseInt(adsHeader.getAttributeString("missionDataTakeId")));
        AbstractMetadata.setAttribute(
            absRoot,
            AbstractMetadata.slice_num,
            Integer.parseInt(imageInformation.getAttributeString("sliceNumber")));

        rangeSpacingTotal += imageInformation.getAttributeDouble("rangePixelSpacing");
        azimuthSpacingTotal += imageInformation.getAttributeDouble("azimuthPixelSpacing");

        AbstractMetadata.setAttribute(
            bandAbsRoot,
            AbstractMetadata.line_time_interval,
            imageInformation.getAttributeDouble("azimuthTimeInterval"));
        AbstractMetadata.setAttribute(
            bandAbsRoot,
            AbstractMetadata.num_samples_per_line,
            imageInformation.getAttributeInt("numberOfSamples"));
        AbstractMetadata.setAttribute(
            bandAbsRoot,
            AbstractMetadata.num_output_lines,
            imageInformation.getAttributeInt("numberOfLines"));
        AbstractMetadata.setAttribute(
            bandAbsRoot,
            AbstractMetadata.sample_type,
            imageInformation.getAttributeString("pixelValue").toUpperCase());

        heightSum += getBandTerrainHeight(prodElem);

        if (!commonMetadataRetrieved) {
          // these should be the same for all swaths
          // set to absRoot

          final MetadataElement generalAnnotation = prodElem.getElement("generalAnnotation");
          final MetadataElement productInformation =
              generalAnnotation.getElement("productInformation");
          final MetadataElement processingInformation =
              imageAnnotation.getElement("processingInformation");
          final MetadataElement swathProcParamsList =
              processingInformation.getElement("swathProcParamsList");
          final MetadataElement swathProcParams = swathProcParamsList.getElement("swathProcParams");
          final MetadataElement rangeProcessing = swathProcParams.getElement("rangeProcessing");
          final MetadataElement azimuthProcessing = swathProcParams.getElement("azimuthProcessing");

          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.range_sampling_rate,
              productInformation.getAttributeDouble("rangeSamplingRate") / Constants.oneMillion);
          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.radar_frequency,
              productInformation.getAttributeDouble("radarFrequency") / Constants.oneMillion);
          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.line_time_interval,
              imageInformation.getAttributeDouble("azimuthTimeInterval"));

          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.slant_range_to_first_pixel,
              imageInformation.getAttributeDouble("slantRangeTime") * Constants.halfLightSpeed);

          final MetadataElement downlinkInformationList =
              generalAnnotation.getElement("downlinkInformationList");
          final MetadataElement downlinkInformation =
              downlinkInformationList.getElement("downlinkInformation");

          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.pulse_repetition_frequency,
              downlinkInformation.getAttributeDouble("prf"));

          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.range_bandwidth,
              rangeProcessing.getAttributeDouble("processingBandwidth") / Constants.oneMillion);
          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.azimuth_bandwidth,
              azimuthProcessing.getAttributeDouble("processingBandwidth"));

          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.range_looks,
              rangeProcessing.getAttributeDouble("numberOfLooks"));
          AbstractMetadata.setAttribute(
              absRoot,
              AbstractMetadata.azimuth_looks,
              azimuthProcessing.getAttributeDouble("numberOfLooks"));

          if (!isTOPSAR() || !isSLC()) {
            AbstractMetadata.setAttribute(
                absRoot,
                AbstractMetadata.num_output_lines,
                imageInformation.getAttributeInt("numberOfLines"));
            AbstractMetadata.setAttribute(
                absRoot,
                AbstractMetadata.num_samples_per_line,
                imageInformation.getAttributeInt("numberOfSamples"));
          }

          addOrbitStateVectors(absRoot, generalAnnotation.getElement("orbitList"));
          addSRGRCoefficients(absRoot, prodElem.getElement("coordinateConversion"));
          addDopplerCentroidCoefficients(absRoot, prodElem.getElement("dopplerCentroid"));

          commonMetadataRetrieved = true;
        }

        ++numBands;
      }
    }

    // set average to absRoot
    AbstractMetadata.setAttribute(
        absRoot, AbstractMetadata.range_spacing, rangeSpacingTotal / (double) numBands);
    AbstractMetadata.setAttribute(
        absRoot, AbstractMetadata.azimuth_spacing, azimuthSpacingTotal / (double) numBands);

    AbstractMetadata.setAttribute(
        absRoot, AbstractMetadata.avg_scene_height, heightSum / filenames.length);
  }
  static void addManifestMetadata(
      final String productName,
      final MetadataElement absRoot,
      final MetadataElement origProdRoot,
      boolean isOCN) {
    final String defStr = AbstractMetadata.NO_METADATA_STRING;
    final int defInt = AbstractMetadata.NO_METADATA;

    final MetadataElement XFDU = origProdRoot.getElement("XFDU");
    final MetadataElement informationPackageMap = XFDU.getElement("informationPackageMap");
    final MetadataElement contentUnit = informationPackageMap.getElement("contentUnit");

    AbstractMetadata.setAttribute(absRoot, AbstractMetadata.PRODUCT, productName);
    final String descriptor = contentUnit.getAttributeString("textInfo", defStr);
    AbstractMetadata.setAttribute(absRoot, AbstractMetadata.SPH_DESCRIPTOR, descriptor);
    AbstractMetadata.setAttribute(absRoot, AbstractMetadata.antenna_pointing, "right");

    final MetadataElement metadataSection = XFDU.getElement("metadataSection");
    final MetadataElement[] metadataObjectList = metadataSection.getElements();

    for (MetadataElement metadataObject : metadataObjectList) {
      final String id = metadataObject.getAttributeString("ID", defStr);
      if (id.endsWith("Annotation") || id.endsWith("Schema")) {
        // continue;
      } else if (id.equals("processing")) {
        final MetadataElement processing = findElement(metadataObject, "processing");
        final MetadataElement facility = processing.getElement("facility");
        final MetadataElement software = facility.getElement("software");
        final String org = facility.getAttributeString("organisation");
        final String name = software.getAttributeString("name");
        final String version = software.getAttributeString("version");
        AbstractMetadata.setAttribute(
            absRoot, AbstractMetadata.ProcessingSystemIdentifier, org + ' ' + name + ' ' + version);

        final ProductData.UTC start = getTime(processing, "start");
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.PROC_TIME, start);
      } else if (id.equals("acquisitionPeriod")) {
        final MetadataElement acquisitionPeriod = findElement(metadataObject, "acquisitionPeriod");
        final ProductData.UTC startTime = getTime(acquisitionPeriod, "startTime");
        final ProductData.UTC stopTime = getTime(acquisitionPeriod, "stopTime");
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.first_line_time, startTime);
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.last_line_time, stopTime);

      } else if (id.equals("platform")) {
        final MetadataElement platform = findElement(metadataObject, "platform");
        String missionName = platform.getAttributeString("familyName", "Sentinel-1");
        final String number = platform.getAttributeString("number", defStr);
        if (!missionName.equals("ENVISAT")) missionName += number;
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.MISSION, missionName);

        final MetadataElement instrument = platform.getElement("instrument");
        AbstractMetadata.setAttribute(
            absRoot, AbstractMetadata.SWATH, instrument.getAttributeString("swath", defStr));
        String acqMode = instrument.getAttributeString("mode", defStr);
        if (acqMode == null || acqMode.equals(defStr)) {
          final MetadataElement extensionElem = instrument.getElement("extension");
          if (extensionElem != null) {
            final MetadataElement instrumentModeElem = extensionElem.getElement("instrumentMode");
            if (instrumentModeElem != null)
              acqMode = instrumentModeElem.getAttributeString("mode", defStr);
          }
        }
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.ACQUISITION_MODE, acqMode);
      } else if (id.equals("measurementOrbitReference")) {
        final MetadataElement orbitReference = findElement(metadataObject, "orbitReference");
        final MetadataElement orbitNumber =
            findElementContaining(orbitReference, "OrbitNumber", "type", "start");
        final MetadataElement relativeOrbitNumber =
            findElementContaining(orbitReference, "relativeOrbitNumber", "type", "start");
        AbstractMetadata.setAttribute(
            absRoot,
            AbstractMetadata.ABS_ORBIT,
            orbitNumber.getAttributeInt("orbitNumber", defInt));
        AbstractMetadata.setAttribute(
            absRoot,
            AbstractMetadata.REL_ORBIT,
            relativeOrbitNumber.getAttributeInt("relativeOrbitNumber", defInt));
        AbstractMetadata.setAttribute(
            absRoot, AbstractMetadata.CYCLE, orbitReference.getAttributeInt("cycleNumber", defInt));

        String pass = orbitReference.getAttributeString("pass", defStr);
        if (pass.equals(defStr)) {
          final MetadataElement extension = orbitReference.getElement("extension");
          final MetadataElement orbitProperties = extension.getElement("orbitProperties");
          pass = orbitProperties.getAttributeString("pass", defStr);
        }
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.PASS, pass);
      } else if (id.equals("measurementFrameSet")) {

      } else if (id.equals("generalProductInformation")) {
        MetadataElement generalProductInformation =
            findElement(metadataObject, "generalProductInformation");
        if (generalProductInformation == null)
          generalProductInformation = findElement(metadataObject, "standAloneProductInformation");

        String productType = "unknown";
        if (isOCN) {
          productType = "OCN";
        } else {
          if (generalProductInformation != null)
            productType = generalProductInformation.getAttributeString("productType", defStr);
        }
        AbstractMetadata.setAttribute(absRoot, AbstractMetadata.PRODUCT_TYPE, productType);
        if (productType.contains("SLC")) {
          AbstractMetadata.setAttribute(absRoot, AbstractMetadata.SAMPLE_TYPE, "COMPLEX");
        } else {
          AbstractMetadata.setAttribute(absRoot, AbstractMetadata.SAMPLE_TYPE, "DETECTED");
          AbstractMetadata.setAttribute(absRoot, AbstractMetadata.srgr_flag, 1);
        }
      }
    }
  }
  @Override
  protected void addBands(final Product product) {

    String bandName;
    boolean real = true;
    Band lastRealBand = null;
    String unit;

    final MetadataElement absRoot = AbstractMetadata.getAbstractedMetadata(product);
    for (Map.Entry<String, ImageIOFile> stringImageIOFileEntry : bandImageFileMap.entrySet()) {
      final ImageIOFile img = stringImageIOFileEntry.getValue();
      final String imgName = img.getName().toLowerCase();
      final MetadataElement bandMetadata = absRoot.getElement(imgBandMetadataMap.get(imgName));
      final String swath = bandMetadata.getAttributeString(AbstractMetadata.swath);
      final String pol = bandMetadata.getAttributeString(AbstractMetadata.polarization);
      final int width = bandMetadata.getAttributeInt(AbstractMetadata.num_samples_per_line);
      final int height = bandMetadata.getAttributeInt(AbstractMetadata.num_output_lines);

      String tpgPrefix = "";
      String suffix = pol;
      if (isSLC() && isTOPSAR()) {
        suffix = swath + '_' + pol;
        tpgPrefix = swath;
      }

      int numImages = img.getNumImages();
      if (isSLC()) {
        numImages *= 2; // real + imaginary
      }
      for (int i = 0; i < numImages; ++i) {

        if (isSLC()) {
          for (int b = 0; b < img.getNumBands(); ++b) {
            if (real) {
              bandName = "i" + '_' + suffix;
              unit = Unit.REAL;
            } else {
              bandName = "q" + '_' + suffix;
              unit = Unit.IMAGINARY;
            }

            final Band band = new Band(bandName, ProductData.TYPE_INT16, width, height);
            band.setUnit(unit);

            product.addBand(band);
            bandMap.put(band, new ImageIOFile.BandInfo(band, img, i, b));
            AbstractMetadata.addBandToBandMap(bandMetadata, bandName);

            if (real) {
              lastRealBand = band;
            } else {
              ReaderUtils.createVirtualIntensityBand(product, lastRealBand, band, '_' + suffix);
            }
            real = !real;

            // add tiepointgrids and geocoding for band
            addTiePointGrids(band, imgName, tpgPrefix);

            // reset to null so it doesn't adopt a geocoding from the bands
            product.setGeoCoding(null);
          }
        } else {
          for (int b = 0; b < img.getNumBands(); ++b) {
            bandName = "Amplitude" + '_' + suffix;
            final Band band = new Band(bandName, ProductData.TYPE_INT32, width, height);
            band.setUnit(Unit.AMPLITUDE);

            product.addBand(band);
            bandMap.put(band, new ImageIOFile.BandInfo(band, img, i, b));
            AbstractMetadata.addBandToBandMap(bandMetadata, bandName);

            SARReader.createVirtualIntensityBand(product, band, '_' + suffix);

            // add tiepointgrids and geocoding for band
            addTiePointGrids(band, imgName, tpgPrefix);
          }
        }
      }
    }
  }