我国地质制图的SRTM DEM数据应用研究

Research on and Application of SRTM DEM Data for Geological Mapping in China

为了满足目前地质图件在立体制图方面的需求,采用SRTM DEM为数据源,通过SRTM DEM地质制图应用与要素分析制图等处理,进行了等高线与坡度、坡向的快速提取,并以湖南省与安徽省的地质图为例,做了Map-GIS平台下的地质图可视化分析。证明将SRTM DEM作为地质图的一个图层要素加以显示,增强图件的立体感的可行性,同时通过DEM与现有的地理数据、地质数据的相互结合分析,进一步说明使用DEM可以提高地质图件要素的精度。

In order to meet the current needs of geological maps in three-dimensional mapping,we chose SRTM DEM as the three-dimensional data source.Through the process of geological mapping application analysis and factor analysis,we conducted the operation of the data accuracy analysis,the rapid extraction of contour,slope and aspect,to improve the water system accuracy combined with the DEM and so on.Then we made the geological map visual analysis with the geological map of Hunan and Anhui provinces as the example on the MapGIS platform.It proved that DEM can display the geological map as a map layer and enhance the map stereo performance.Meantime,combined the DEM with existing geographical data and geological data,through the comparative analysis,it proved that DEM can improve the precision of geological elements expression.