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  1. Open launch file named rtabmap.launch
  2. change <arg name="namespace" default="rtabmap1"/> <arg name="database_path" default="~/.ros/rtabmap1.db"/>
  3. now copy rtabmap.launch file in the same path and rename it as rtabmap2.launch and agin edit it
  4. change <arg name="namespace" default="rtabmap2"/> <arg name="database_path" default="~/.ros/rtabmap2.db"/>
  5. now launch 2 different launch file or

add namespace:=rtabmap2 and databse_path:= ~/.ros/rtabmap2.db at the end of launch command