How to use pointclouds from Kinect?

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I think that your best start would be to look into the openni_launch package this will help you to get the raw data from the kinect. The next thing I would recommend is to look into the Point Cloud Library. They are very heavily tied to ROS and provide a very robust library for handling RGB-D data.

Finally PCL offers many tutorials that discuss the topics you want to look into check out the following:

• ICP
• Localization (map building)
• As for robot_pose_ekf I do not know what this is but there is a ROS page here that seems to cover the concept and the use of the ROS node pretty well so please check that out.

Hope this helps. BadRobot