visad/src/main/java/ucar/nc2/iosp/mcidas/McIDASGridServiceProvider.java
public boolean isValidFile(RandomAccessFile raf) throws IOException {
    mcGridReader = new McIDASGridReader();
    return mcGridReader.init(raf, false);
  }
public boolean isValidFile(RandomAccessFile raf) throws IOException {
    mcGridReader = new McIDASGridReader();
    return mcGridReader.init(raf, false);
  }
Is this a valid file?

@param raf RandomAccessFile to check
@return true if a valid McIDAS grid file
@throws IOException problem reading file