NXT robot calibration [closed]

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Hi, I have a robot that I'm using NXT_ROS to run and I'm trying to figure out how to calibrate it's odometry. The robot is running on tank tracks(similiar to the "shooter bot" that comes with the kit) which complicates matters as the only settings I can find are wheel_radius and wheel_basis. How do I set these values for tank tracks or is there another way to calibrate the odometry? Thanks!