基于粗糙度的雨海地形及撞击坑特征分析

Analysis of Mare lmbrium topography and crater based on roughness

以月球雨海地区为研究区,利用Matlab编程语言,结合分辨率为118 m的DEM数据,得出了该地区的均方根高程及均方根偏差分布图,并在研究区内选取18条剖面线,对其进行多种粗糙度参数计算。结果表明雨海地区粗糙度较大的区域主要分布在环形山和撞击坑等区域,粗糙度较小值则主要分布在被火山熔岩流填充的平原等区域,可以确定在百米尺度上环形山和撞击坑是影响雨海地形粗糙度的重要因素。对单个撞击坑而言,坑壁粗糙度最大,坑缘次之,坑底较为平坦,粗糙度最小。坑底粗糙度增大的现象可初步推断该撞击坑存在中央峰。

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