Guided beta caseProbeginnerTF buffer
The transform is too old
Restore scan projection without increasing the TF cache arbitrarily.
Pairs with Time and TF in ROS 2 Systems Debugging. Read the concept first, then diagnose it here.
Unlock this lab with ProOperator report
The TF tree is connected, but projection fails with extrapolation into the past.
Ubuntu 24.04, ROS 2 Jazzy, Python and C++ nodes, browser telemetry workspace
System boundary
Trace only the relevant path.
/scan stampTF buffer windowcostmap projection
How this lab works
You diagnose it — no command list.
Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you — finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.
Verification
Your repair must pass more than the visible symptom.
- Scan transforms at its stamp
- Buffer remains 10 seconds
- Hidden regression behavior
- Root cause explanation