ros bag dataset to map [closed]

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hi,

I'm new to ROS so maybe my question is silly but...

i've followed the ROS tutorial to get the map and the occupancy matrix starting from the bag file provided in the example.

Where can i find other bag file to play with ?

I've searched on the web but seems that all the laserscan dataset are provided in other format, like carmen log file or others. Maybe there's a way to use these different file format logs to produce maps and occupancy matrix ?