“嫦娥三号”降落区溅射物空间分布关系

Spatial Distribution of Ejecta in Landing Area of Chang’E-3

针对“嫦娥三号”着陆区溅射物与撞击坑间缺乏多尺度耦合关系解译的问题,提出了基于大小、频率和方向的空间分布关系量化表达方法。以“嫦娥三号”降落相机影像为基础,采用人工识别的方式,提取出直径大于0.1 m的撞击坑2564个,以及尺寸大于0.1 m的石块2363个。划分不同直径石块和撞击坑所在区域避免分辨率不均的影响,并通过方位角分区研究溅射物与方向的关系。结果表明,石块、撞击坑的数量随直径的增大而减小;“紫微”撞击坑的溅射是有方向性的;着陆点恰好位于2个溅射区之间,着陆区域主要分布直径0.5 m以下的石块和撞击坑,相比于着陆区周边,该区的地形较为平坦。

To solve the problem of the interpretation of the multi-scale coupling relationship between the ejecta and impact craters in the Chang’E-3 landing area,a quantitative expression method is proposed based on the spatial distribution relationship of size,frequency and direction.Based on the images of the Chang’E-3 descent camera,2564 impact craters with a diameter greater than 0.1 m and 2363 boulders with size greater than 0.1 m are manually extracted.The mosaicked images are divided to several areas according the ground resolution of the descent camera images to avoid the uneven resolution problem,and the direction of the ejecta is studied by azimuth zoning.The results show that:the number of boulders and impact craters decreases with increasing diameter;the ejecta of the“Zi Wei”impact crater is directional;the landing point is located between the two ejecta areas,and in the landing area,the boulder and impact crater diameter distribution is mainly less than 0.5 m and the topography compared to the surrounding areas is relatively flat.