运行FAST_LIO2：
步骤1:
cd /home/slam/FAST_LIO
source devel/setup.bash
roslaunch ./src/FAST_LIO/launch/mapping_velodyne.launch
步骤2:
cd /home/slam/datasets
rosbag play kitti_2011_09_30_drive_0016_synced.bag
TUM格式的轨迹保存在：/home/slam/FAST_LIO/tum_path.txt
运行FAST-LIVO：
步骤1:
cd /home/slam/FAST_LIO
source devel/setup.bash
roslaunch fast_livo mapping_avia.launch
步骤2:
cd /home/slam/datasets
rosbag play hku1.bag