# \#tf **URL:** https://get-help.theconstruct.ai/tag/tf/78.md [Latest](https://get-help.theconstruct.ai/latest.md) · [Categories](https://get-help.theconstruct.ai/categories.md) · [Tags](https://get-help.theconstruct.ai/tags.md) --- ## [Tengo todos los datos de el cuestionario de tf](https://get-help.theconstruct.ai/t/tengo-todos-los-datos-de-el-cuestionario-de-tf/33407)
**Author:** [@roboticsUAM](https://get-help.theconstruct.ai/u/roboticsUAM)\ **Replies:** 1\ **Last updated:** [November 11, 2024, 10:01am UTC](https://get-help.theconstruct.ai/t/tengo-todos-los-datos-de-el-cuestionario-de-tf/33407 "2024-11-11T10:01:59Z")
tengo el paquete tf\_exercises\_pkg con carpetas launch, urdf y config config/pi\_robot\_control.yaml urdf/pi\_robot\_v2.urdf launch/pi\_robot\_control\_alljoints.launch y cuando envio el cuestionario tengo esto y mi calificaci… --- ## [Rviz2 no tf data](https://get-help.theconstruct.ai/t/rviz2-no-tf-data/25691)
**Author:** [@NoN33d](https://get-help.theconstruct.ai/u/NoN33d)\ **Replies:** 0\ **Last updated:** [August 5, 2023, 10:26am UTC](https://get-help.theconstruct.ai/t/rviz2-no-tf-data/25691 "2023-08-05T10:26:00Z")
Hello guys, I have installed ROS2 Foxy on a VM (Oracle VirtualBox) running on Ubuntu 20.04 and I am trying to run a very simple navigation with my Turtlebot3 Burger robot but I can’t make it work. The thing is that I h… --- ## [Unknown reason for transform failure](https://get-help.theconstruct.ai/t/unknown-reason-for-transform-failure/15604)
**Author:** [@BYR2022](https://get-help.theconstruct.ai/u/BYR2022)\ **Replies:** 2\ **Last updated:** [February 21, 2022, 1:15pm UTC](https://get-help.theconstruct.ai/t/unknown-reason-for-transform-failure/15604 "2022-02-21T13:15:46Z")
Hello, I am using RPlidar for gmapping, I have laser\_scan\_matcher to improve odom but when run the file the map registirs the first scan and then a transform error occurs. Transform \[sender=unknown\_publisher\] Unknown… --- ## [Explanation on math in navigation of robots in TF ROS 101](https://get-help.theconstruct.ai/t/explanation-on-math-in-navigation-of-robots-in-tf-ros-101/12940)
**Author:** [@Joseph1001](https://get-help.theconstruct.ai/u/Joseph1001)\ **Replies:** 10\ **Last updated:** [February 4, 2022, 8:51am UTC](https://get-help.theconstruct.ai/t/explanation-on-math-in-navigation-of-robots-in-tf-ros-101/12940 "2022-02-04T08:51:52Z")
In the course TF ROS 101, we are trying to get one robot to follow another based on the TF readings. 1.Can someone explain these two-line of math that is used to calculate the path and why we multiply the angle we der… --- ## [Turtle1 not visible in Gazebo (TF BASICS)](https://get-help.theconstruct.ai/t/turtle1-not-visible-in-gazebo-tf-basics/13463)
**Author:** [@Joseph1001](https://get-help.theconstruct.ai/u/Joseph1001)\ **Replies:** 2\ **Last updated:** [November 4, 2021, 4:48pm UTC](https://get-help.theconstruct.ai/t/turtle1-not-visible-in-gazebo-tf-basics/13463 "2021-11-04T16:48:06Z")
Hi, in the course TF, chapter 2-TF BASICS, the turtle1 is not visible in gazebo. When I click on the approximate area that the turtle1 would be, I get a square wireframe, showing its presents, but not visible. Can you sh… --- ## [Difference between subscribing to the /odom and create a tf.TransformListener()](https://get-help.theconstruct.ai/t/difference-between-subscribing-to-the-odom-and-create-a-tf-transformlistener/9348)
**Author:** [@m.haghbeigi](https://get-help.theconstruct.ai/u/m.haghbeigi)\ **Replies:** 3\ **Last updated:** [April 12, 2021, 8:11pm UTC](https://get-help.theconstruct.ai/t/difference-between-subscribing-to-the-odom-and-create-a-tf-transformlistener/9348 "2021-04-12T20:11:12Z")
In order to get robots position and orientation, I’ve learned two methods: listening to /odom topic. creating a tf.TransformListener() between ‘odom’ and ‘base\_footprint’ or ‘base\_link’. what is the difference b… --- ## [Problem in Live class 67 Rosject (multiple robots exploration)](https://get-help.theconstruct.ai/t/problem-in-live-class-67-rosject-multiple-robots-exploration/8720)
**Author:** [@Saqibmehmood736](https://get-help.theconstruct.ai/u/Saqibmehmood736)\ **Replies:** 3\ **Last updated:** [March 15, 2021, 2:39pm UTC](https://get-help.theconstruct.ai/t/problem-in-live-class-67-rosject-multiple-robots-exploration/8720 "2021-03-15T14:39:31Z")
Hello Everyone,i am trying to implement rosject of live class 67 (Multiple Robot Exploration). Most of the rosject is working fine but there is problem with “odom” topic and frame. Kobukis robots are not publishing any “… --- ## [Multiple Robot Exploration](https://get-help.theconstruct.ai/t/multiple-robot-exploration/8525)
**Author:** [@Saqibmehmood736](https://get-help.theconstruct.ai/u/Saqibmehmood736)\ **Replies:** 1\ **Last updated:** [February 27, 2021, 7:50am UTC](https://get-help.theconstruct.ai/t/multiple-robot-exploration/8525 "2021-02-27T07:50:00Z")
Hello Everyone, I hope you will be in good health. Currently I am working on multiple robot exploration on KUKA youBot mobile manipulator, when i launch multiple youBots i cant see laser scan data in rviz for any of the…