CITIGEN

You often need city shots for your films and animation. Using a good quality drone is a good option, as long as you are an expert in aerial cinematography equipped with the necessary licenses and permits from local authorities--not to mention property releases of buildings that might be captured too close in your drone camera.
Another option is exploring the use of CGI.
Now with CITIGEN - an "add-on", or "plug-in" for "Blender" (A powerful, open-source, 3D graphic suite. Think of it as Linux in 3D industry, but officially endorsed by AMD, Apple, Intel, Nvidia, Ubisoft, and etc.) - You might get a decent, if not stunning, aerial shots of cities that look like that of real things.