5.3.2 ROS command line tools

Course subject(s) Module 5. Robot Vision

In this lecture, we will continue on the previous lecture of why we may get an error message with tf_echo. Therefore we will learn about TF and query timing.

Query timing

  • Transform information is continuously updated.
  • Transform information publishes on the /tf topic.
  • No guarantee that the query and publication time is the same!
      • Query for a transform in a future will result in:
        “Particular source or target frame is not yet available”
      • Errors go away once the desired frames are refreshed or become available.
Creative Commons License
Hello (Real) World with ROS - Robot Operating System by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://online-learning.tudelft.nl/courses/hello-real-world-with-ros-robot-operating-systems//.
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