关键词: ArcGIS, 坐标系统, 投影, 区域地震构造图

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.

Key words: ArcGIS, coordinate system, projection, regional seismotectonic map