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Three-Dimensional Geological Mapping Methods with DEM: A Case Study in Hainan Island in 1∶ 500 000 Scale

Ding Wei-cui1,Li Ting-dong1,2,Fan Ben-xian1,Ding Xiao-zhong1,Geng Shu-fang1, Yang Qiang3,Wang Zhen-yang1,Lu Yong-guang1 1.Institute of Geology,Chinese Academy of Geological Science,Beijing 100037,China 2.College of Earth Sciences,Jilin University,Changchun 130061,China 3.Center for Hydrogeology and Environmental Geology of CGS,Baoding 071051,Hebei,China  
The research took Hainan Island as the example,shows how to carry out 1∶ 500 000 3D hillsha-ding geological mapping based on DEM and by jointly using the Global Mapper,ArcGIS and MapGIS softwares.Firstly,make automatic registration between SRTM DEM data and 1∶ 500 000 vector geographic data under different map parameters;secondly,overlapped the geological elements with the DEM;third,rectified the geolo-gical dividing line of Quaternary System,realized the production of the 1∶ 500 000 Hainan Island 3D geological mapping.The present research also summarizes the methods about data conversation between different ellipsoid bodies and coordinate system,about filling up the black area of the DEM data and production the 3D geological map and so on.The DEM data used in the research satisfy 1∶ 500 000 geological mapping requirement,and the 3D geological map has enhanced the stereoscopic effect and readability of the map,improved the accuracy and information of geological maps,and made the map more clear in three-dimensional geological structure when compared with the traditional geological map.It can provide a new method and way for Chinese geological mapping and for other 3D maps production.
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