Images acquired at lower than full-resolution were summed onboard the spacecraft. For example, an image with intrinsic resolution of 1.5 meters per pixel that has been summed 4 times will have an actual resolution of 6.0 meters per pixel. For narrow angle images, the crosstrack and downtrack summing are always the same. For wide angle images, the crosstrack and downtrack summing can be commanded to be different from each other. Compression type MOC images can be compressed before being transmitted to Earth.
Numbers following compression type indicate lossless, lossy, and compression factors used.
Please consult PDS data product for additional information. Gain mode Exposure of the MOC is limited by the line-time. See the PDS products for details on the meaning of gain values stated here. See PDS products for details on the meaning of offset values stated here. This is the approximate longitude location of the image center on the planet, Mars.