In spelling out the requirements for real time display for airborne and space vehicles, it is normally necessary to employ recorded data obtained previously in flight. This may take the form of aerial photographs, radar photographs, IR photographs, moving pictures or video tapes taken by airborne systems. Generation of real time imagery for use in simulators is a complex and costly process. Further, the use of recorded data results in greater flexibility in variations of the data processing and display sub-system. The immediate drawback of such a method is the lack of flexibility in varying sensor characteristics.
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