public int open(String path) {
		
		if(path == null)
		{
			LOG.error("Open null path");
			return -1;
		}
		try {
			nc = NetcdfFile.open(path);
			if( nc == null ){
				LOG.error("OPEN FILE FAILURE");
				return -1;
			}
		} catch (IOException e) {
		
			e.printStackTrace();
		}
		return 0;
	}