Satellite images are based on?

The question is difficult, because the time frame is not specified. If all of history is included, then the correct answer is D. In the earliest days of spy satellites, the exposed film was jettisoned from the orbiting satellite and recovered on earth and then developed and processed in the usual manner. However, electronic digital pictures soon usurped this primitive technology. Digital photography is one of the many technologies that has come directly from the Space Program.