不同源DEM数据在高山区重力中区地形改正中的适用性  

The applicability of different sources DEM data in median region terrain correction of gravity in high mountain areas

作　　者：刘生荣[1,2,3] 高鹏 耿涛[1,2] 郭伟立 杜辉[1,2] LIU Sheng-Rong;GAO Peng;GENG Tao;GUO Wei-Li;DU Hui(Xi'an Center of China Geological Survey,Xi'an 710054,China;Northwest Geological Science and Technology Innovation Center,Xi'an 710054,China;Centre for Orogenic BeltGeology,CGS,Xi an 710054,China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]西北地质科技创新中心,陕西西安710054 [3]中国地质调查局造山带地质研究中心,陕西西安710054

出　　处：《物探与化探》2019年第5期1111-1118,共8页Geophysical and Geochemical Exploration

基　　金：国家重点研发计划“典型覆盖区航空地球物理技术示范与处理解释软件平台开发”所属课题“北秦岭华阳川地区隐伏铀矿空—地—井协同勘查技术示范研究”(2017YFC0602205);中国地质调查局“东天山喀拉塔格—雅满苏一带戈壁荒漠浅覆盖区地质填图”项目(DD20179607)

摘　　要：以青海省夏日哈木矿区作为高山试验区,利用航摄高精度1∶2000DEM数据对1∶5万DEM数据、AsterDEM数据和PleiadesDEM数据进行垂直精度比较分析,并对这3种数据在高山区复杂地形条件下重力中区地形改正中的适用性进行研究。结果表明在高山区这种复杂地形条件下,3种DEM数据的精度从高到低依次为PleiadesDEM、1∶5万DEM和AsterDEM;PleiadesDEM数据在1∶5万或更小比例尺重力中区地形改正中具有较好的适用性,1∶5万DEM数据在1∶20万或更小比例尺重力中区地形改正中具有较好的适用性,而AsterDEM不能满足1∶20万或更大比例尺重力中区地形改正的精度要求。Taking the Xiarihamu mining area in Qinghai Province as an alpine experimental area,the authors used the high-precision1 ∶2,000 DEM data to make a comparative analysis of the vertical accuracy of1 ∶50,000 DEM data,Aster DEM data and Pleiades DEM data as well as the applicability of these data in median region terrain correction of gravity under the complex terrain conditions such as high mountain areas.The results show that the accuracy of Pleiades DEM is the highest,that of1 ∶50,000 DEM possesses the second place, and hat of Aster DEM is the lowest under the complex terrain conditions of high mountainous area.The Pleiades DEM data have good applicability in median region terrain correction of gravity scale of1 ∶50,000 or less,and the1 ∶50,000 DEM data have good applicability at a scale of1 ∶200,000 or less,but the Aster DEM cannot meet the accuracy requirements at a scale of1 ∶200,000 or more.

关 键 词：高山区 DEM 重力 中区地形改正 

分 类 号：P631[天文地球—地质矿产勘探]