> For the complete documentation index, see [llms.txt](https://campus-rover.gitbook.io/lab-notebook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://campus-rover.gitbook.io/lab-notebook/fiiva/advanced-visualization.md). # How do I visualize the contents of a bag I have spent many hours tracking down a tricky tf tool and in doing that came across some new techniques for troubleshooting. In this FAQ I introduce using rosbag with Webviz ## Rosbag This CLI from ROS monitors all topic publications and records their data in a timestamped file called a bag or rosbag. This bag can be used for many purposes. For example the recording can be "played back" which allows you to test the effects that a certain run of the robot would have had. You can select which topics to collect. One other use is to analyze the rosbag moment to moment. ## Webiz Is an online tool (). You need to understand topics and messages to use it and the UI is a little bit obscure. But it's easy enough. You supply your bag file (drag and drop) and then arrange a series of panes to visualize all of them in very fancy ways. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://campus-rover.gitbook.io/lab-notebook/fiiva/advanced-visualization.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.