Which of the following is not considered an element of surveillance radar data?

The National Airspace System (NAS) information is not typically considered an element of surveillance radar data. Surveillance radar data primarily focuses on tracking aircraft and their positions, ensuring safe air traffic operations. Among the elements of surveillance radar data, primary radar returns are essential as they provide raw data on the positions and movements of aircraft. Weather information can be crucial for understanding conditions that could impact aircraft, while real-time quality control (RTQC) ensures the accuracy and reliability of the radar data being utilized.

NAS information, on the other hand, encompasses a broader context that includes regulatory, airspace structure, and traffic flow management elements not specifically part of the surveillance radar's data set. Therefore, it is distinct from the fundamental aspects associated with surveillance radar.