随着计算机软硬件和三维可视化等技术的发展，地图的表现形式越来越多，种类也越来越丰富。其中，基于三维地理空间模型的三维地图能够以更为直观、形象的三维方式来对地理空间进行表达，因而逐渐受到人们的重视。然而，目前对三维地理空间模型的设计大多停留在高仿真阶段，所建的地物模型往往不能代表一般性地物，无法重复利用，不利于地图整体的系统性，并且在制作过程中存在大量的重复性劳动，模型数据量也偏大。因此我们在需求方和制作方双方平衡的角度上去理解，三维模型的不同尺度的呈现在需求方面前是合适的。 三维数据模型的多尺度表达，是在建立同一地点，相同建筑的城市模型，通过对模型的纹理和建模的技术的研究，运用原始的编码，分类的原理，缩小图形负载量。从而通过Skyling的二次开发，能够按照需求方的要求来合理安排三维数字模型的负载量，从而能够让三维数字模型能够多尺度的流畅的表达出来。其主要研究成果： 1.以传统二维地图的多尺度，理解二维地图的变比例尺的理论，分析和比较与三维地图的比例尺。 2.通过讨论是三维数字模型的纹理和模型的负载量来减小三维地图的的负载量，达到流畅浏览地图。 3.对LOD模型的细节算法的理论进行深入研究，了解.x与.xpl的数据格式的区别。其次在基于Skyline的平台，实现三维数字模型的多比例尺。 4.建立不同比例尺的的区域和单独的模型，从而进行对三维数字模型多比例尺的表达进行研究。

With the development of computer hardware and software and 3D visualization techniques, forms the map more and more species are more abundant. Among them, three-dimensional map of the three-dimensional model based on the geographical space can be more intuitive, three-dimensional image of the way to express the geographic space, and gradually people's attention. However, the design of three-dimensional geospatial model simulation mostly stay in the high stage, the feature model is often not representative of the general construction of the feature can not be reused, is not conducive to the overall systemic map, and there are a lot in the production process repetitive work, the amount of data model is also large. So we go to understand the demand side and the production side of both balanced perspective, three-dimensional models of different scales presented before the demand side is right Multi-scale representation of three-dimensional data model is to establish the same place, the same architectural model of the city, through the study of the texture of the model and modeling techniques, the use of the original coding, classification theory, reduce the graphics load. Thus by secondary development SKYling of, in accordance with the requirements of the demand side to make reasonable arrangements load three-dimensional digital model, which allows three-dimensional digital model can smooth out expression multiscale. The main findings: 1 to multi-scale traditional 2D maps, understanding the theory of two-dimensional maps of varying scale, analysis, and compared with a three-dimensional map scale. 2 Through discussions load textures and three-dimensional digital model of the model to reduce the three-dimensional map of the load, to achieve smooth browsing maps. 3.The establishment of regional and individual models of different scales, and thus be on the three-dimensional digital model of multi-scale expression studies. 4.Research In TerraExplorer Pro environment, try to browse through its designated flight mode, navigate to the three-dimensional model.