月球正面撞击坑的空间分布特征分析

通过IAU最新公布的撞击坑名录、“嫦娥一号”影像与DEM数据,本文使用数理统计和空间分析的方法研究了月球正面撞击坑分布的空间不均衡性.主要体现在:(1)月球正面直径较大的撞击坑主要分布在月陆区域,且集中趋势明显,而月海区域直径较大的撞击坑分布较少,周围有大量直径较小的撞击坑;(2)直径较大的撞击坑在月表具有一定随机性,...

Analysis on the Spatial Distribution Characteristics of Lunar Near Side Impact Craters

The mathematical statistics and spatial analyses for lunar near side impact craters are used to un ravel potential spatial heterogeneity based on the crater nomenclature released by International Astronomi- cal Union （IAU） and topography and imagery data from Chang＇E- 1 （CE- 1）. The spatial heterogeneity is mainly embodied in the following aspects： （1）the craters with larger diameters dominantly distribute in the highland and show obvious concentration tendency, however, the male have much fewer larger cra- ters, accompanying by munificent smaller craters; （2） larger craters have the characteristics of random- ness and the smaller crater are concentrated in local areas; （3） density differences： the regions closer to e- quator have higher crater frequencies than the regions to the pole; the trailing hemisphere is cratered at a higter rate than the leading hemisphere; the most densely cratered region is located in the south-central part of the lunar nearside; （4） depth-diameter ratios differences- the craters with depth larger than 2.5 km almost are found in the highland, and there is a marked concentration of points around the central meridian where it cuts through the southern continent; between 57~N and 24~S, the ratio is at a high lev- el; the maximum value occurs near 14~N, and the average value fluctuates at 0. 14; approaching the poles, the ratios are becoming smaller, and the minimum value occurs at the south pole region; and （5） gradient differences： the average of crater＇s maximum gradient in highland is far greater than the value of craters in mare; the average of crater＇s maximum gradient shows apparent pattern： from lunar equator to the poles, the average of crater maximum gradient increases gradually. The spatial pattern of lunar craters shows marked regional differentiation characteristics, and the relationship between the pattern and the crater forming theory remains much work to be done before the ultimate goal can be reached.