public int countImagesInSector(Sector sector, int levelNumber) {
    if (sector == null) {
      String msg = Logging.getMessage("nullValue.SectorIsNull");
      Logging.logger().severe(msg);
      throw new IllegalArgumentException(msg);
    }

    Level targetLevel = this.levels.getLastLevel();
    if (levelNumber >= 0) {
      for (int i = levelNumber; i < this.getLevels().getLastLevel().getLevelNumber(); i++) {
        if (this.levels.isLevelEmpty(i)) continue;

        targetLevel = this.levels.getLevel(i);
        break;
      }
    }

    // Collect all the tiles intersecting the input sector.
    LatLon delta = targetLevel.getTileDelta();
    Angle latOrigin = this.levels.getTileOrigin().getLatitude();
    Angle lonOrigin = this.levels.getTileOrigin().getLongitude();
    final int nwRow = Tile.computeRow(delta.getLatitude(), sector.getMaxLatitude(), latOrigin);
    final int nwCol = Tile.computeColumn(delta.getLongitude(), sector.getMinLongitude(), lonOrigin);
    final int seRow = Tile.computeRow(delta.getLatitude(), sector.getMinLatitude(), latOrigin);
    final int seCol = Tile.computeColumn(delta.getLongitude(), sector.getMaxLongitude(), lonOrigin);

    int numRows = nwRow - seRow + 1;
    int numCols = seCol - nwCol + 1;

    return numRows * numCols;
  }
  private MercatorTextureTile[][] getTilesInSector(Sector sector, int levelNumber) {
    if (sector == null) {
      String msg = Logging.getMessage("nullValue.SectorIsNull");
      Logging.logger().severe(msg);
      throw new IllegalArgumentException(msg);
    }

    Level targetLevel = this.levels.getLastLevel();
    if (levelNumber >= 0) {
      for (int i = levelNumber; i < this.getLevels().getLastLevel().getLevelNumber(); i++) {
        if (this.levels.isLevelEmpty(i)) continue;

        targetLevel = this.levels.getLevel(i);
        break;
      }
    }

    // Collect all the tiles intersecting the input sector.
    LatLon delta = targetLevel.getTileDelta();
    Angle latOrigin = this.levels.getTileOrigin().getLatitude();
    Angle lonOrigin = this.levels.getTileOrigin().getLongitude();
    final int nwRow = Tile.computeRow(delta.getLatitude(), sector.getMaxLatitude(), latOrigin);
    final int nwCol = Tile.computeColumn(delta.getLongitude(), sector.getMinLongitude(), lonOrigin);
    final int seRow = Tile.computeRow(delta.getLatitude(), sector.getMinLatitude(), latOrigin);
    final int seCol = Tile.computeColumn(delta.getLongitude(), sector.getMaxLongitude(), lonOrigin);

    int numRows = nwRow - seRow + 1;
    int numCols = seCol - nwCol + 1;
    MercatorTextureTile[][] sectorTiles = new MercatorTextureTile[numRows][numCols];

    for (int row = nwRow; row >= seRow; row--) {
      for (int col = nwCol; col <= seCol; col++) {
        TileKey key =
            new TileKey(targetLevel.getLevelNumber(), row, col, targetLevel.getCacheName());
        Sector tileSector = this.levels.computeSectorForKey(key);
        MercatorSector mSector = MercatorSector.fromSector(tileSector); // TODO: check
        sectorTiles[nwRow - row][col - nwCol] =
            new MercatorTextureTile(mSector, targetLevel, row, col);
      }
    }

    return sectorTiles;
  }
    public URL getURL(Tile tile, String altImageFormat) throws MalformedURLException {
      StringBuffer sb;
      if (this.URLTemplate == null) {
        sb = new StringBuffer(WWXML.fixGetMapString(tile.getLevel().getService()));

        if (!sb.toString().toLowerCase().contains("service=wms")) sb.append("service=WMS");
        sb.append("&request=GetMap");
        sb.append("&version=").append(this.wmsVersion);
        sb.append(this.crs);
        sb.append("&layers=").append(this.layerNames);
        sb.append("&styles=").append(this.styleNames != null ? this.styleNames : "");
        sb.append("&transparent=TRUE");
        if (this.backgroundColor != null) sb.append("&bgcolor=").append(this.backgroundColor);

        this.URLTemplate = sb.toString();
      } else {
        sb = new StringBuffer(this.URLTemplate);
      }

      String format = (altImageFormat != null) ? altImageFormat : this.imageFormat;
      if (null != format) sb.append("&format=").append(format);

      sb.append("&width=").append(tile.getWidth());
      sb.append("&height=").append(tile.getHeight());

      Sector s = tile.getSector();
      sb.append("&bbox=");
      sb.append(s.getMinLongitude().getDegrees());
      sb.append(",");
      sb.append(s.getMinLatitude().getDegrees());
      sb.append(",");
      sb.append(s.getMaxLongitude().getDegrees());
      sb.append(",");
      sb.append(s.getMaxLatitude().getDegrees());
      //            sb.append("&"); // terminate the query string

      return new java.net.URL(sb.toString().replace(" ", "%20"));
    }