bool FrontEndFlow::SaveTrajectory() {
static std::ofstream ground_truth, laser_odom;
static bool is_file_created = false;
if (!is_file_created) {
if (!FileManager::CreateDirectory(WORK_SPACE_PATH +
"/slam_data/trajectory"))
return false;
if (!FileManager::CreateFile(ground_truth, WORK_SPACE_PATH +
"/slam_data/trajectory/ground_truth.txt"))
return false;