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三维地理场景的可视化是虚拟地理环境研究中展示各类复杂地学过程与现象的重要技术。目前,现实中地理场景大多具有复杂度高、规模大、交互性强等特点,故采用传统的单个计算机单屏显示方式,已无法满足用户对沉浸感、大视野、高分辨率的可视化应用需求,而多屏显示技术是一个解决该问题的有效途径。本文以福建长汀县水土流失治理过程中植被覆盖变化为例,开展了时序三维地理场景的单机多屏同步可视化技术和漫游系统研究。提出了系统的软件架构和开发流程,并引入多线程同步机制,实现了三视图场景的构建、三屏同步显示、三屏同步路径漫游、矢量图的差异符号化和三维场景实景图片嵌入播放等技术,设计并实现了一个以单个计算机控制三个显示屏幕的时序同步可视化漫游系统。采用3个时相的彩色遥感卫星影像,叠加数字高程模型形成反映不同时期水土流失程度变化的三维地理场景,在水土流失治理过程成果展示中得到了应用。系统除了三维场景沉浸感强、震撼力大之外,还具有动态变化、信息量大、表现力强等特点,在地理场景动态可视化方面有独特的应用前景。
The visualization of 3D geographic scene is an important technique to display all kinds of complex geosciences and phenomena in the research of virtual geographic environment. At present, in reality, most of the geographic scenes have the characteristics of high complexity, large scale and strong interaction. Therefore, the traditional single-screen single-screen mode can not meet the user’s visual application requirements of immersion, large field of view and high resolution , And multi-screen display technology is an effective way to solve this problem. Taking the vegetation cover change in soil erosion control of Changting County of Fujian Province as an example, the paper studies single-plane multi-screen synchronization visualization technology and roaming system of time-sequence three-dimensional geographic scene. The software architecture and development process of the system are introduced, and the multi-thread synchronization mechanism is introduced to realize the construction of three-view scene, three-screen synchronous display, three-screen synchronized path roaming, different symbolization of vector graphics, embedded real- Technology, design and implementation of a single computer control of the three display screen timing synchronization visual roaming system. The three-phase color remote sensing satellite images and the superimposed digital elevation model are used to form three-dimensional geographical scenes that reflect the changes of soil and water loss in different periods and are applied in the display of soil and water loss treatment process results. In addition to the strong sense of immersion and the great power of the 3D scene, the system also has the characteristics of dynamic changes, large amount of information and strong expressiveness, and has unique application prospect in the dynamic visualization of geographical scenes.