三维GIS中矢量数据的高效精确渲染方法  

Precisely and Efficiently Vector Data Rendering Method in 3D GIS

作　　者：李尚林[1] 胡夏[1] 刘晓平[1] 

机构地区：[1]合肥工业大学计算机与信息学院,合肥230009

出　　处：《系统仿真学报》2017年第5期965-972,共8页Journal of System Simulation

基　　金：国家自然科学基金(61370167;61305093);国家科技支撑计划项目(2012BAJ08B01)

摘　　要：在地理信息系统(GIS,Geographic Information System)中,矢量数据在空间位置定位和空间分析等方面有着许多重要的应用,精确高效的将二维矢量数据叠加绘制到三维地形上是必需的。提出了一种动态矢量纹理金字塔叠加绘制方法。根据当前视点位置实时生成对应金字塔级别的矢量纹理块,矢量纹理分块与地形分块一一对应,统一调度渲染,并使用无约束各向异性滤波的纹理反走样方法来减轻纹理走样问题。该方法独立于底层地形几何体,因此能够跟大部分多分辨率地形绘制方法很好的进行结合。在数字地球系统中使用多层矢量数据的实验结果表明,所提算法绘制效率较高,绘制效果良好。In the geographic information system （GIS）, vector data has many important applications in such aspects as orientation space location and spatial analysis. It is essential to make 2D vector data overlay mapping to the 3d terrain accurately and efficiently in 3D GIS. A method based on dynamic vector texture pyramid was proposed to render vector data. The real-time generated vector texture block corresponding with the level of the pyramid according to the current view position. Vector data texture block and terrain block are one-to-one correspondence, then they are unified rendering. Unconstrained anisotropic texture filtering methods was used to reduce the texture aliasing problem. Because this method is independent of the underlying terrain geometry, so that it can combine with most multi-resolution terrain rendering methods. Experiments using multi-vector data in the digital earth system show the presented method has higher efficiency and better rendering effect.

关 键 词：三维GIS 矢量数据 动态纹理金字塔 无约束各项异性滤波 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]