Merge multi-robot's maps

edit

Thanks a lot, if i want to merge maps using gmapping, do you have any suggestion? For example, a framework to realize it or some related work? It seems that Gmapping does not have this function itself.

can you please click on the little checkmark next to this answer, then.

There's a package called multirobot_map_merge can merges maps.

I have some problem with /start_trajectory, like it will say topic [scan] is already used.can you speak more specific about it,Thanks in advance.

This is cartographer specific, yes? I am not an expert on that. I would suggest opening a new question and clearly describe the problem you have with cartographer.

OK, Thank you~.