amcl in the map which is SLAM out by another robot [closed]

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Hi,guys, I'm now trying to localize the robot in the map SLAMed out by another robot at the same time using hector mapping. But the result showed as if the robot just stayed at the origin of the map. I set the param "first_map_only" true, the result seemed right; but I need the map keep on freshing. It seemed that once the topic subscribes a new map, the pose of the robot will be set to the initial pose. How can i fix that?