What is the radius around an obstacle that must be considered when determining minimum altitude over a built-up area?

When determining minimum altitude over a built-up area, a radius of 2000 feet around an obstacle must be considered. This requirement is in place to ensure a safe vertical clearance above any structures and to enhance safety for both the aircraft and individuals on the ground. The 2000-foot buffer provides a margin that takes into account not only the height of the obstacle but also potential issues such as turbulence and wake vortices that can be generated by the structure. The regulation helps in defining a safe operational ceiling above populated areas, thus reducing the risk associated with flying in proximity to obstacles while maintaining a suitable distance that protects the aircraft from the dangers they may pose.