private String getTypeStr(PointCloud2 cloud) {
		String typeStr = new String("TYPE");
		for(PointField field: cloud.fields){
			switch(field.datatype){
			case(1):
			case(3):
			case(5):
				typeStr = typeStr + " I";
				break;
			case(2):
			case(4):
			case(6):
				typeStr = typeStr + " U";
				break;
			case(7):
			case(8):
				typeStr = typeStr + " F";
				break;
			}
		}
		return typeStr;
	}