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Using the markers as @Falko and @Medhi said is not the correct way to do this. Markers are intended for visualization only. ar_track_alvar broadcasts a tf frame for each ar tag. You can find the distance by using tf to lookup the transform from whatever robot frame you're interested in (e.g. base_link) to the tag's frame.

See:

• ar_track_alvar provided tf transforms

• tf (C++, Python)

Using the markers as @Falko and @Medhi @Medhi. said is not the correct way to do this. Markers are intended for visualization only. ar_track_alvar broadcasts a tf frame for each ar tag. You can find the distance by using tf to lookup the transform from whatever robot frame you're interested in (e.g. base_link) to the tag's frame.

See:

• ar_track_alvar provided tf transforms

• tf (C++, Python)

Using the markers as @Falko and @Medhi. @Mehdi. said is not the correct way to do this. Markers are intended for visualization only. ar_track_alvar broadcasts a tf frame for each ar tag. You can find the distance by using tf to lookup the transform from whatever robot frame you're interested in (e.g. base_link) to the tag's frame.

See:

• ar_track_alvar provided tf transforms

• tf (C++, Python)