Load KITTI velodyne data, play in ROS.
$ roslaunch kitti_velodyne_ros kitti_velodyne_ros.launch
If you want to save the point cloud as a csv file, simply activate in kitti_velodyne_ros.launch :
<param name="save_to_csv" type="bool" value="true"/>
In case you want to play with LOAM:
$ roslaunch kitti_velodyne_ros kitti_velodyne_ros_loam.launch