capture only 360º from velodyne HDL32E [closed]

edit

I've followed the tutorial [Getting Started with the Velodyne HDL-32E] and I can get a video in real time from velodyne doing:

1. sudo ifconfig eth0 192.168.3.100 <-- IP for my PC
2. sudo route add 192.168.18.108 eth0 <-- velodyne IP
3. roslaunch velodyne_pointcloud 32e_points.launch calibration:=/home/vic/32db.yaml
4. rosrun rviz rviz -f velodyne > configure as the tutorial said.

It works fine, but I need to process the data from a static 360º scene, not from the video. So I need a program which do:

1. capture a 360º from velodyne
2. process the data
3. again capture a new 360º scene

Which ROS command should I use? Thanks in advance.