Data Considerations for Planetary Space Science Photography

Analog and digital data processes are discussed for interplanetary photoscience. Particular reference is made to the Mariner Mars flyby photo mission. A planetary flyby picture taking sequence produces a relatively fast accumulation of video data bits. This data is stored on magnetic tape. As the telemetry data rate at planetary range is extremely slow, days must elapse for continuous transmission of the stored picture information. A study of the analog and digital resolution criteria indicates that for the low contrast scenes viewed, a high SNR at the camera is desired. When the spacecraft is so limited in power, weight, and transmission capability, a ground based computer usefully enhances contrast and resolution.