College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China

Using the MATLAB programming language and DEM data with a resolution of 118 meters, the root mean square elevation and root mean square deviation distribution map of Mare lmbrium is obtained, and a variety of roughness parameters are calculated for the 18 profiles selected in the local study area. The results show that the areas with greater roughness in the Mare lmbrium are mainly distributed in craters and impact craters, while the areas filled with lava flows show smaller value of roughness. Therefore, it can be concluded that the craters and impact craters on the scale of 100 meters are important factors affecting the roughness of Mare lmbrium. For a single impact crater, the roughness of the wall is the highest, followed by the crater margin, and the flat bottom of crater is with the smallest roughness. For the large impact crater with roughness increasing at the base, there might be a central peak.