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Hi, I am hoping that you have followed the link http://www.ros.org/wiki/turtlebot/Tutorials/Looking%20at%20Camera%20Data to do this. I guess the problem faced here is due to the communication between the turtlebot(netbook) and workstation.

If teleop tutorial worked for you earlier to this then the communication may be fine. This could be an issue as you are trying to transfer all the cloud (640x480) over wireless lan.

You may confirm where the problem is by directly visualizing the same on the turtlebot(netbook) itself having taken it out of the turtlebot rack and openning the closed lid of the laptop. If you are able to see the cloud in the rviz there. Then its for sure the rate of pointclouds being published from the netbook to the workstation.

If you are not able to visualize the cloud in the netbook please try to echo the topic of the cloud. It may have to do with the configuration of the laptop you are using on the turtlebot as well.

I see the above possibilities for this error.

Hope this helps, Karthik