Michal, Is this a message you see once at startup, or is your listener spewing lots of these messages? A good tool to debug this problem is the tf_monitor: "rosrun tf tf_monitor map base_link" Wim On Thu, Jun 24, 2010 at 2:53 AM, wrote: > > > Hi all, > > I'm trying to follow the tutorial on transform listener: > > http://www.ros.org/wiki/tf/Tutorials/Writing%20a%20tf%20listener%20(C%2B%2B) > > I'm trying to use it with simulated pr2 and gmapping to determine location > of the robot relative to the map. What I'm getting is following message: > > [ERROR] 4546.007000467: Could not find a connection between '/map' and > '/base_footprint' because they are not part of the same tree.Tf has two or > more unconnected trees. When trying to transform between /map and > /base_footprint. > > although, rviz shows the transforms and connections just fine, tf_echo > outputs the transforms as well and tf_view prints out just one tree > (attached). > > Any hints on what might be the problem would be very appreciated. > > Michal > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users > > -- -- Wim Meeussen Willow Garage Inc.