visad/src/main/java/ucar/nc2/iosp/grid/GridServiceProvider.java
@Override
  public void open(RandomAccessFile raf, NetcdfFile ncfile, CancelTask cancelTask) throws IOException {
    super.open(raf, ncfile, cancelTask);
  }
@Override
  public void open(RandomAccessFile raf, NetcdfFile ncfile, CancelTask cancelTask) throws IOException {
    super.open(raf, ncfile, cancelTask);
  }
Open the service provider for reading.

@param raf        file to read from
@param ncfile     netCDF file we are writing to (memory)
@param cancelTask task for cancelling
@throws IOException problem reading file