分辨率和比例尺是地理空间数据的重要特征，二维地理空间数据在纸质的条件用比例尺表示，在数字条件下用分辨率表示；三维地理空间数据在数字条件下用分辨率表示。在三维建模时，怎么样把不同的地物用统一的标准去规范是本文探索的重点。论文的主要内容和成果概括如下： 1、介绍一些常用的三维地理空间数据模型，三维地表模型和三维地物模型，以及对DTM和DEM的区别进行比较找出共同点和不同点。并且对三维数字城市进行详细的阐述，为三维建模提供概念的支持。 2、阐述三维地理空间模型精确程度，为分辨率的概念的提出提供依据。三维模型的精确程度，不只是平面精度而且还包含三维模型的高程精度，结合数字高程模型（DEM）的精度指标，找出精度规律，以及描述了三维模型制作的产品规范，从而更好的为结论的得出创造条件。 3、通过对通视分析和日照分析两个限制因子的研究可以更好的约束三维空间模型的精度，进而提取较为准确的三维模型精度。 4、从二维图形的制图综合类推出三维地图的综合取舍，两者的区别就在于一个是平面图形一个是立体图形，在低分辨率的时候可以用标准的空间体代替真实的实体空间体。在进行三维地物形状取舍应该遵循宁可对地物放大也不能缩小的原则，以保证三维空间模型的安全性。 5、通过前五章的描述得到第六章的结论部分。第六章整体阐述了分辨率的概念，并且提出在分辨率多少的时候，显示的精度是多少？而且规定了不同成图比例尺下，地物表达的不同取舍。

Resolution and scale are important characteristics of geospatial data, two-dimensional geospatial data in the conditions of use scale paper that under the conditions used in the digital resolution representation; dimensional geospatial data under the conditions used in the digital resolution representation. In the three-dimensional modeling, how to use a different feature unified standard to regulate Modeling is the focus of this article to explore. The main contents and results are summarized as follows: 1 describes some commonly used three-dimensional geospatial data model, focusing on the three-dimensional surface model and 3D feature model, as well as the difference between DTM and DEM are compared to identify similarities and differences. And detailed, 3D digital city concept for three-dimensional modeling support. 2 of the degree of precision three-dimensional geospatial model to provide a basis for the resolution proposal of the concept. And the degree of precision of the three-dimensional model, not just a flat-screen accuracy and mainly contains the height accuracy of the model, the accuracy of the digital elevation model (DEM)study to find out the laws of accuracy, as well as description of the product specification for 3D modeling, and thus more good to create the conditions for the conclusions drawn. 3 through the pass, as the analysis and sunshine analysis of the accuracy of the two constraints limiting factors in the better three-dimensional model, and then extract more accurate three-dimensional model height, find a reliable basis for the proposed resolution. 4 three-dimensional map of choice, both in the difference lies in a plane figure is a three-dimensional graphics, in the low-resolution instead of the real with the standard space launch from the two-dimensional graphics cartographic generalization entity Spatial body. Should follow the principle of rather larger surface features can not be reduced during the three-dimensional feature shape trade-offs, in order to ensure the safety of the three-dimensional model. 5 the description of the first five chapters of the concluding part of the Chapter VI. Chapter overall elaborated the concept of the resolution, and raised in the number of resolution, the accuracy is how much? And provides for different mapping scales, the feature expression of different trade-offs.