$ roslaunch turtle_gazebo turtle_world.launch
$ roslaunch turtle_navigation nav_stack.launch
- Front
- Back
- Left 30 deg
- Left 50 deg
- Right 30 deg
- Right 50 deg
- cliff_mark_threshold - Threshold for IR ranges above which to be considered as cliffs.
- cliff_mark_distance - Range that should be published if a cliff is detected.