so first mapping then i save the map with map server
then i relaunch the just modifying the same launch file with localization set to true ? is that true ?
In the example, the map is automatically saved under `~/.ros/rtabmap.db`. When relaunching in localization mode, rtabmap reloads `~/.ros/rtabmap.db` and starts localizing in it. There is no map_server or AMCL involved in that example.