移动GIS中可视化技术研究

针对移动设备硬件特点,提出移动GIS中3D可视化简化模型,并设计简化的三维投影变换算法,描述根据已有的2D矢量数据创建3D地图的过程。接着针对移动设备有限的软硬件资源条件,提出了空间数据组织和处理原则。为了逼真地展现地理场景的立体视觉效果,给出了3D可视化预处理措施,并采取了必要的3D场景增强技术,以较少的时间和空间代价,完成3D变换。最后,通过实验,在移动G IS系统中实施了基于2D矢量空间数据的3D可视化技术,生成直观、逼真、实时的3D地图,同时给出了实验测试数据。

Research on visualization technology in mobile GIS

Firstly the paper proposes a pseudo visualization model and designs a simplified 3D projection transformation algorithm and describes a procedure for creating 3D map from existing 2D vector data according to the feature of mobile device hardware.Then due to the condition of limited software and hardware resource of mobile device,it presents a principle of spatial data organization and processing.In order to show the 3D scene with 2D data,it suggests a kind of method of 3D pre-processing,at the same time,it adopts necessary enhanced 3D technology,which fulfill the 3D transformation with less time complexity and low space complexity.Finally it makes an experiment to implements 3D visualization method based on 2D vector spatial data,which produce a real-time 3D map,and show some test result about the 3D visualization speed.