$ source devel/setup.bash
$ roslaunch gem_launch gem_init.launch world_name:="track1.world"
$ source devel/setup.bash
$ roslaunch gem_launch gem_sensor_info.launch
$ source devel/setup.bash
$ rosrun gem_pure_pursuit_sim pure_pursuit_sim.py
$ source devel/setup.bash
$ rosrun gem_stanley_sim stanley_sim.py
$ source devel/setup.bash
$ roslaunch gem_launch gem_init.launch world_name:="track2.world" y:=-98.5
$ source devel/setup.bash
$ roslaunch gem_launch gem_init.launch
$ source devel/setup.bash
$ roslaunch gem_launch gem_init.launch world_name:="highbay_track.world" x:=-1.5 y:=-21 yaw:=3.1416