[Bug] Map not displayed in Rviz2

[chenlu.han]

This is an error report.

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Screenshot of the error

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Error details

Exercise 2.3: I tried to configure the map display according to the screenshot in course notebook, but it still says "No map received" If I do: ros2 topic echo /map I do get something back, and the header looks correct.

[saxosun]

Hello did you have choosen correctly reliability and durability policy?

[chenlu.han]

This is the reliability and durability policy I have, I tried to use the same as shown in course notebook.

[roalgoal]

Ok, since you have the correct QoS settings, what you can do is:

1. Confirm that the map_server ran correctly and provided the map (I assume it did because you metion you are able to echo /map)
2. Uncheck/check the actual “Map” element in rviz2. Since the map server only publishes once, sometimes rviz2 might not catch it.
3. Restart the map server with rviz2 launched

[chenlu.han]

Thanks a lot for the hints!
Starting rviz before map_server solved the problem.