For any who find this thread in the future, it was asked and solved on ROS Answers: http://answers.ros.org/question/906/tf-spits-a-lookup-exception - Eric On Mon, May 16, 2011 at 12:11 AM, Tully Foote wrote: > Hi Dimitar, > > I expect that this error comes from improper usage of the library in your > code. I suggest that you isolate it down to as small a test case as you can > reproduce and ask it on answers.ros.org. If it is determined to be a bug > then a ticket can be filed to fix it. > > Tully > > On Tue, May 10, 2011 at 6:26 AM, Dimitar Simeonov < > simeonov.dimitar@gmail.com> wrote: > >> Hello, >> I'm not sure whether this is better asked at answers.ros.org, but since >> it looks like a bug I'm sending it here >> >> I'm using the tf package and specifically the tf.TransformerROS class in >> Python. >> If I try calling its methods transformPose or transformPointCloud it >> returns a LookupException >> >> tf.LookupException: Frame id /map does not exist! When trying to >> transform between /base_link and /map. >> >> However if I try running the tf_monitor right after that I see that tf has >> knowledge of the frame >> >> ~>rosrun tf tf_monitor base_link map >> Waiting for transform chain to become available between /base_link and >> /map >> >> RESULTS: for /base_link to /map >> Chain is: /base_link -> /base_footprint -> /odom_combined -> /map >> Net delay avg = 0.00684423: max = 0.054 >> >> Frames: >> Frame: /base_footprint published by /robot_pose_ekf Average Delay: >> 0.0185 Max Delay: 0.026 >> Frame: /base_link published by /robot_state_publisher Average Delay: >> 0.0075 Max Delay: 0.008 >> Frame: /odom_combined published by /slam_gmapping Average Delay: 0 Max >> Delay: 0 >> >> All Broadcasters: >> Node: /robot_pose_ekf 33.5196 Hz, Average Delay: 0.0185 Max Delay: >> 0.026 >> Node: /robot_state_publisher 55.5556 Hz, Average Delay: 0.0075 Max >> Delay: 0.008 >> Node: /slam_gmapping 25 Hz, Average Delay: 0 Max Delay: 0 >> >> I'm running gazebo simulation and have ROBOT=sim set. >> >> Best, >> Dimitar >> _______________________________________________ >> ros-users mailing list >> ros-users@code.ros.org >> https://code.ros.org/mailman/listinfo/ros-users >> >> > > > -- > Tully Foote > Systems Engineer > Willow Garage, Inc. > tfoote@willowgarage.com > (650) 475-2827 > > _______________________________________________ > ros-users mailing list > ros-users@code.ros.org > https://code.ros.org/mailman/listinfo/ros-users > >