I want to use the localization part of [hector_mapping](http://wiki.ros.org/hector_mapping), so I want to test the accuracy of the localization. I am going to set a straight physical track for the robot, so the path of the robot is a very straight line. Then I want to get the `hector_mapping` localization trajectory(a track containing all the localization points), and then compare the actual trajectory with the `hector_mapping` locating trajectory. How can I get the the above track measured by `hector_mapping`? Or is there a better way to test the localization accuracy of `hector_mapping`?
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