基于邻域高程比对算法的月表撞击坑自动提取研究  

Automatic Extraction of Lunar Craters Based on Neighborhood Elevation Comparison Algorithm

作　　者：赵昊[1,2] 周毅[1,2] 陈旻[3] 刘丹阳[3] ZHAO Hao;ZHOU Yi;CHEN Min;LIU Dan-yang(School of Geography and Tourism ,Shaanxi Normal University ,Xican 710062;National Demonstration Center for Experimental Geography Education, Shaanxi Normal University ,Xican 710062;Key Laboratory of Virtual Geographic Environment,Ministry of Education, Nanjing Normal University,Nanjing210023,China)

机构地区：[1]陕西师范大学地理科学与旅游学院,陕西西安710062 [2]地理学国家级实验教学示范中心(陕西师范大学),陕西西安710062 [3]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210023

出　　处：《地理与地理信息科学》2017年第4期69-73,共5页Geography and Geo-Information Science

基　　金：国家自然科学基金面上项目(41371424);中央高校基本科研业务费项目(GK201703042);国家自然科学青年基金项目(41201464)

摘　　要：月表撞击坑的精准自动提取是月球地貌特征研究的基础。该文基于坑缘部位相对突起的形态特征,利用月球勘测轨道器相机(LROC)提供的100m分辨率数字高程模型(DEM)数据,采用邻域高程比对算法对撞击坑进行自动识别。该方法首先确定坑缘轮廓位置,继而采用数学形态学方法进行噪声过滤、细化连接和自动识别坑缘处栅格。在月海和月陆地区提取实验结果表明:该方法对简单型撞击坑和复杂型撞击坑的提取率在64.7%以上,对边缘退化型撞击坑的提取率为63.6%;对比目视解译结果,提取准确率在74.5%以上;所提取撞击坑与自然形态吻合较好,偏移距离在400m以内的坑缘栅格数占81.5%以上。Accurate extraction of craters is of great significance for thestudy on the getilogical evolution of the moon.Therefore,this paper designs neighborhood elevation combination algorithm for detecting the convex shape of crater edge by using the100meters resolution DEM data derived from the Lunar Reconnaissance Orbiter Camera(LROC).There are three steps for auto-matic lunar crater detecting:1)Smoothing whole study area by using a3@3mean operator.Combination between the original DEM and the smoothing one were made for filtering out the potential raster of the crater edge.2)Reclassification method was then used for detection of potential lunar crater raster.The reclassification thresholds are0.91meters in highland area and0.76meters in mare area separately.3)Mathematical morphology algorithms were used to filter and connect the lunar crater raster derived by the last step.Results of accuracy analysis show that this method has great performance in the extraction tests for simple impact crater,connecting crater and some edge degradation craters.Comparing with the artificial visual interpretation re-sults,the extraction accuracy rates are74.6%in lunar highland area and74.5%in mare area respectively.Also,the offset dis-tance between extraction results and manual interpretations were calculated.The rates of raster that with the offsets distance lower400meters are81.5%in lunar highland area as well as97.7%in mare area.

关 键 词：DEM 月表撞击坑 自动提取 邻域高程比对 

分 类 号：P184.5[天文地球—天文学]