How to synchronize the map in Rviz and Stage

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Hi to All,

I am new to ROS. I am doing the navigation simulation based on the package of "navigation_stage". I replace the default map with mine and generate the .world file. But when I run the simulation, the maps in Rviz and that in Stage are not synchronous (they are not in the same coordinate). I notice the size, orientation can be adjusted in the .world file. But I do not know how to set the values for them.

Is any one know about this? Thanks in advance.

Fangwen