一种基于等高线的小型撞击坑识别方法  

Automatic Small Crater Recognition Using Digital Elevation Model from Chang'E-2 by Contour Line

作　　者：刘宇轩[1,2,3] 李春来 刘建军[1,3] Liu Yuxuan;Li Chunlai;Liu Jianjun(National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Lniversity of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Lunar and Deep Space Exploration,Chinese Academy of Sciences,Beijing 100101,China)

机构地区：[1]中国科学院国家天文台,北京100101 [2]中国科学院大学,北京100049 [3]中国科学院月球与深空探测重点实验室,北京100101

出　　处：《天文研究与技术》2018年第4期479-486,共8页Astronomical Research & Technology

基　　金：国家自然科学基金(41401509;41671458)资助

摘　　要：撞击坑自动识别是行星探测任务中重要的研究热点之一。由于数据精度和算法局限性等问题,以往的方法往往针对识别尺度较大的撞击坑。基于目前国际上精度最高、覆盖最全的嫦娥二号数字高程模型数据,提出一种基于等高线自动识别小型撞击坑的方法。首先,分析小型撞击坑模型的等高线特征,确定特征参数,建立指标体系;其次,提取实验区等高线信息,筛选出符合特征参数的等高线;最后,利用霍夫变换拟合撞击坑边界,提取撞击坑位置和大小信息。通过对实验区域的小型撞击坑识别结果分析表明,该方法可针对不同尺度的小型撞击坑设置不同的参数,分批次识别提取,综合识别正确率达90%以上,说明该方法对于自动识别小型撞击坑是有效的。该方法弥补现有自动识别方法针对尺度较大撞击坑的缺陷,识别结果补充月球撞击坑数据库中的小尺度撞击坑,为今后建立全月球撞击坑数据库打下基础。Crater detection is a significant research focus in planetary mission. Most of algorithm focus on big crater because the data resolution is not precise enough. So this article proposes a method about small craters automatic recognition from digital elevation model of chang＇e-2 data, which is the most precise lunar global data so far. Firstly, we analyze the feature of little crater model to get the parameter and establish index system. Secondly, we get the contour of test data and extract the candidate. Thirdly, we use the Hough- Transform to get the craters information, including the coordinate and diameter. According to the resuh of test district, we can conclude that the method is useful. The accuracy of the detection is over 85%, and we can set different parameter for different range of craters. The method and the resuh are good supplement to recent crater detection research, especially to the little size craters. It is the foundation of global carter database in the future work.

关 键 词：撞击坑识别 嫦娥二号数字高程模型 地形分析 等高线 

分 类 号：P391.9[天文地球—地球物理学]