The Mars Pathfinder mission required new capabilities and adaptation of existing capabilities in order to support science analysis and flight operations requirements imposed by the in situ nature of the mission. The Science Data Processing Systems Section of the Jet Propulsion Laboratory was responsible for the design, development, and application of the system required to perform telemetry processing, distribution, and archiving of data from the four primary science instruments, and support of flight operations through production of automatically generated stereo and color mosaics, terrain visualizations, and animations. The system developed for Mars Pathfinder incorporated new capabilities in producing computer-generated color mosaics, for cataloging and distribution of science data, and utilized new display technology to support science analysis and flight operations requirements. This paper describes the data processing performed to support the science and operations payload on the Pathfinder lander and Sojourner rover. ¿ 1999 American Geophysical Union