【摘要】 1/25万区域地震构造图是城市活断层探测工作的成果图件之一。目前各城市的1/25万区域地震构造图多是在已有的1/20万地质图的基础上编绘出来的,由于目前可收集到的纸制1/20万地质图均是北京54坐标系统下的图件,而《中国地震活动断层探测技术系统技术规程》要求的1/25万区域地震构造图是西安80坐标系下的图件。文中介绍了用ArcGIS软件实现利用1/20万地质图编绘1/25万区域地震构造图的方法。更多还原

【Abstract】 1 ∶250,000 regional seismotectonic map is one of graphic documents achieved in the urban active fault survey project.At present,the 1 ∶250,000 regional seismotectonic maps of various cities are drawn mostly basing on the existing 1 ∶200,000 geological maps.The available paper-made 1 ∶200,000 geological maps are the graphic documents under Beijing 54 Coordinates Systems.However,according to Stipulation on Technical System for China Earthquake Active Fault Surveying issued by China Earthquake Administration,the 1 ∶250,000 regional seismotectonic maps are the graphic documents under Xi’an 80 Coordinate Systems.This article introduces the basic concepts of coordinates systems and the map projection and proposes explicitly that when scanning and digitizing paper geological map,the coordinate’s projection parameters indicated in the paper geological map shall be taken for setting up projection information.The conversion of screen coordinates to map coordinates is realized through space coordinate registration,and by projection conversion,the Beijing 54 Coordinates System is converted to Xi’an 80 Coordinates System.Finally,with the aid of ArcGIS software,the 1 ∶250,000 regional seismotectonic maps are compiled based on 1 ∶200,000 geologic maps.更多还原