1. Complete the previous two exercises.
2. In the Field Selector window, make sure the DVN (Base Reflectivity Tilt 1) dataset is selected in the Data Sources panel and the Image Sequence field is selected in the Fields panel. In the Displays panel, select Data Probe/Time Series, and then click the Create Display button.
3. In the main view window, you will see a small red probe in the middle. Move the probe around over the echoes and notice the value changing in the Data Probe control window. Can't find probe?
4. Set the time animation to the first timestep.
5. Move the probe to the leading edge of the bow echo and turn on the time animation. Note that the value readout in the Probe control changes to show the value at that position for each time step.
6. Stop the animation and return to the first timestep.
7. Use the Displays→Special→Range and Bearing menu to add in the range and bearing tool. Position the left end point of the probe on the radar grid at 100km and 180 degrees.
8. Animate through the time sequence one step at a time, keeping track of where the cell that was under the left end point of the probe has moved to. Stop on the last timestep.
9. Position the right end of the range and bearing probe at the point where the cell has moved to. How fast did the storm move?
10. Remove all displays.

Unidata IDV Workshop for version 6.2u2 > Accessing and Displaying Data > Displaying Satellite and Level III Radar Imagery