This study used the bundle adjustment technology to optimize the original orbit measurement data by treating Mars as a unified adjustment network, reducing the position deviation between individual MoRIC images to under 1 pixel, and achieving pixel-level “seamless” global image mosaicking.

Brightness and color consistency of the global images was ensured through color correction and global color uniformity. The true colors of the Martian surface were measured using the MMS onboard the Tianwen-1 orbiter, and a true-color reference for the Martian surface was established for true color restoration.

Through this study, a global color image dataset and map of Mars (Tianwen-1 Mars Global Color Orthomosaic 76 m v1), with a resolution of 76 m and a horizontal accuracy of 68 m was produced and released.