visad/src/main/java/ucar/nc2/iosp/gempak/GempakGridReader.java
public static GempakGridReader getInstance(RandomAccessFile raf, boolean fullCheck) throws IOException {
    GempakGridReader ggr = new GempakGridReader(raf.getLocation());
    ggr.init(raf, fullCheck);
    return ggr;
  }
public static GempakGridReader getInstance(RandomAccessFile raf, boolean fullCheck) throws IOException {
    GempakGridReader ggr = new GempakGridReader(raf.getLocation());
    ggr.init(raf, fullCheck);
    return ggr;
  }
Initialize the file, read in all the metadata (ala DM_OPEN)

@param raf       RandomAccessFile to read.
@param fullCheck if true, check entire structure
@return A GempakGridReader
@throws IOException problem reading file