To get a map, you must go through a basic site to download Commands. ( https://emanual.robotis.com/docs/en/platform/turtlebot3/quick-start/ ) And copy the commands from him and start a new terminal.
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Choose your current version such as noetic in the link above and copy Commands.
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Go to Simulation for this link( https://emanual.robotis.com/docs/en/platform/turtlebot3/simulation/ )
And copy these Commands
$ cd ~/catkin_ws/src/
$ git clone -b noetic-devel https://github.com/ROBOTIS-GIT/turtlebot3_simulations.git
$ cd ~/catkin_ws && catkin_make
Then when finished, choose waffle with this command
$ export TURTLEBOT3_MODEL=waffle
$ roslaunch turtlebot3_gazebo turtlebot3_world.launch
Finally,
$ roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
- Go to the last SLAM Simulation commands ( https://emanual.robotis.com/docs/en/platform/turtlebot3/slam_simulation/)
Open a new terminal
$ export TURTLEBOT3_MODEL=waffle
$ roslaunch turtlebot3_gazebo turtlebot3_world.launch
-Run SLAM Node
$ export TURTLEBOT3_MODEL=waffle
$ roslaunch turtlebot3_slam turtlebot3_slam.launch slam_methods
-Run Teleoperation Node
$ export TURTLEBOT3_MODEL=waffle
$ roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
To view map
$ rosrun map_server map_saver -f ~/map
