Need help to get coordinates from rviz running rplidar
Hello everyone, I am running ROS Melodic on raspberry pi 4 (Debian). I have installed rplidar as well as Hector_Slam and both are running fine. I can view track my sensor as well as view the map in rviz now. The point is that I want to extract the coordinates of the points that are shown in rviz and use that to create my own map. I have tried using rosbag record to record the bag file. I run the roscore and open rviz and then play the bag file using rosbag play but the rviz does not show anything. I do not know if my bag file contains the data I need. I do not know how pointcloud, laserscan or pointcloud2 works in rviz. Could you please help me with this? I am stuck in this step for far too long. Thank you for your time. Much appreciate!
What command did you use to record data to rosbag?
I used $ rosbag record -a to record everything. I tried using $ rosbag record /scan as well. Both didnt work.
Can you play your rosbag alone in one terminal and in a new terminal, enter
$ rostopic listand see which topics have shown up?This is what I see in the terminal while a bag file is playing: pi@raspberrypi:~ $ rostopic list /clock /initialpose /map /map_metadata /move_base_simple/goal /poseupdate /rosout /rosout_agg /scan /slam_cloud /slam_out_pose /tf /tf_static pi@raspberrypi:~ $
Is any data showing up when you do
$ rostopic echo /scanother than 'NAN' or '0'? Also, how is your RPi being powered up?A lot of data shows up while i use that code. Also, I am using 5v adapter to power my raspberry pi.
Can you share your ROS bag?
Deepak, sorry for the late reply. Here is the bag file. https://drive.google.com/file/d/1xHQU...
Please help me extract coordinates of the points for each revolution.