Digital Mapping Technology of Geological and Structural Maps of Xizang, Qiangtang Area Based on MAPGIS

Geographic information system (GIS) and computer techniques will be introduced in the next national land and resources surveying. GIS software will provide modernization techniques with digital mapping of geological maps. MAPGIS, recommended as the first chosen platform of GIS made in China, has a lot of powerful functions of computer aided mapping. Its application has resulted in considerable progress since it was introduced in regional geological surveying. This paper describs the digital mapping technique with MAPGIS by an example of Qiangtang, Xizang (Tibet), which has complex geological structures and plentiful geological contents, using 1∶500 000 geological map and 1∶1 000 000 structural map of the area. It has given a special account of the data preparing, process design, raster to vector, coordinate grid, error rectification, map junction, topological area creation, line parameter editing, color collocation and copying technology.