1. build VLP-16 lib

in the "catkin_ws/src"
download 'loam_velodyne', 'velodyne', 'velodyne_puck' using github search
in the "catkin_ws"
catkin_make

2. VLP-16 View

in the "catkin_ws"
roslaunch loam_velodyne loam_velodyne.launch
roslaunch velodyne_pointcloud VLP16_points.launch