Which type of target information is not displayed by the PPI?

The PPI, or Plan Position Indicator, is a specific type of radar display used primarily in aviation and maritime contexts. It is designed to represent data in a two-dimensional format, typically displaying targets plotted in relation to the radar antenna's position.

Distance, speed, and direction can all be derived from the information presented on a PPI. Distance is indicated through the range rings that radiate from the center of the display, allowing users to see how far away a target is. Speed can be inferred from tracking the movement of targets over time, as the PPI provides a real-time view of their location. Direction is indicated by the angular position of the target in relation to the radar antenna, typically represented as a compass heading on the display.

Height, however, is not directly presented on a standard PPI. While some advanced radar systems may incorporate altitude information, traditional PPIs focus on planar representations where vertical metrics like height are not available. Thus, the PPI does not typically include information about the height of targets, making it distinct from other parameters such as distance, speed, and direction.