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Hi

I have a question.

I have created a map using slam_gmapping package, then I save that map as map.yaml using rosrun map_server map_saver -f map.

Is it possible to use a laser and the map I have created with amcl for localization?

I appreciate your answer :)


Originally posted by acp on ROS Answers with karma: 556 on 2013-04-12

Post score: 0

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1 Answer 1

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Short answer: yes.

Longer answer: Yes, it is possible. Use the map_server to publish your saved map, start amcl and use rviz to estimate the inital pose. Then move your robot around and see, if the localization is working. :)


Originally posted by Ben_S with karma: 2510 on 2013-04-12

This answer was ACCEPTED on the original site

Post score: 1


Original comments

Comment by acp on 2013-04-12:
well, I do the following: I use rosrun map_server map_server map.yaml then in another console I use rosrun amcl amcl scan. Then the only topic I see in rviz under Pose is /move_base_simple/goal. I supposed to see amcl_pose topic under Pose, right?

Comment by Ben_S on 2013-04-12:
According to the docs, amcl publishes the pose as geometry_msgs/PoseWithCovarianceStamped. But you can also add displays for the particlecloud (geometry_msgs/PoseArray) and tf. Through tf, amcl should publish the most likely transform between your map and odom.

Comment by acp on 2013-04-12:
well, i have 2 issues, 1.-how i can set the initial pose 2--why my map gets rotated after I have published it and visualized in rviz?

Comment by Ben_S on 2013-04-12:\

  1. In rviz you should have a "2d pose estimate" button. 2) Depending on your fixed frame, the visualized map can rotate if the best guess by amcl changes. Try setting the fixed frame to /map in rviz.

Comment by acp on 2013-04-14:
Well, it seems to be as it everything is working, the only issue now is how to see the estimated poses produced by amcl in rviz? in other words, how can I see that amcl is working?

Comment by Ben_S on 2013-04-14:
Add a display of type PoseArray to rviz, set the topic to /particlecloud and then drive around a little bit. You then should see all the pose-guesses of amcl as small arrows in rviz.

Comment by acp on 2013-04-15:
Well, it seems to be as PoseAarray is working under rviz, however, from the beginning the amcl algorithm spreads particles even outside the map. Is that normal? or is there a way to fix it?

Comment by acp on 2013-04-15:
Since amcl publishes the pose as geometry_msgs/PoseWithCovarianceStamped, how can I see the poses with covariance under rviz?

Comment by Ben_S on 2013-04-15:
Thats normal. You can use the "2d pose estimate" in rviz to give it a hint, where to start. (Click the button and drag the arrow on the map.) Regarding the visualization of PoseWithCovarianceStamped: I dont know if that is possible. (rviz does not seem to have a builtin display for that...)

Comment by acp on 2013-04-18:
Well, it seems to be as if the navigation is working properly. Just one issue 1.-when I set the '2d pose estimate' and then '2d nav goal' the robot goes to the goal with a lot of rotations, is there any way to make the robot goes a straight line?

Comment by FuerteNewbie on 2013-11-21:
I guess visualizing PoseWithCovarianceStamped is not available in rviz currently but you can 'rostopic echo amcl_pose' to see the message that feedback to you every time the filter update.

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