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The MapMetaData message type used for the "/map_metadata" topic provides information about the transform and scaling of the grid map with regards to the (metric) map frame (Essentially allowing to convert between grid and metric coordinates). Note it contains no information about a robot´s location whatsoever. If you have setup everything correctly (which appears to be the case if your Turtlebot is mapping the environment), you can use tf to obtain the robot´s pose estimate. Have a look at this tutorial and this Q/A.