Resolution Three-dimensional Geospatial Data

Resolution and scale are important characteristics of geospatial data, two-dimensionalgeospatial data in the conditions of use scale paper that under the conditions used in thedigital resolution representation; dimensional geospatial data under the conditions used in thedigital resolution representation. In the three-dimensional modeling, how to use a differentfeature unified standard to regulate Modeling is the focus of this article to explore. The maincontents and results are summarized as follows:1describes some commonly used three-dimensional geospatial data model, focusing onthe three-dimensional surface model and3D feature model, as well as the difference betweenDTM and DEM are compared to identify similarities and differences. And detailed,3D digitalcity concept for three-dimensional modeling support.2of the degree of precision three-dimensional geospatial model to provide a basis for theresolution proposal of the concept. And the degree of precision of the three-dimensionalmodel, 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, aswell as description of the product specification for3D modeling, and thus more good to createthe conditions for the conclusions drawn.3through the pass, as the analysis and sunshine analysis of the accuracy of the twoconstraints limiting factors in the better three-dimensional model, and then extract moreaccurate three-dimensional model height, find a reliable basis for the proposed resolution.4three-dimensional map of choice, both in the difference lies in a plane figure is athree-dimensional graphics, in the low-resolution instead of the real with the standard spacelaunch from the two-dimensional graphics cartographic generalization entity Spatial body.Should follow the principle of rather larger surface features can not be reduced during thethree-dimensional feature shape trade-offs, in order to ensure the safety of thethree-dimensional model.5the 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 ofresolution, the accuracy is how much? And provides for different mapping scales, the featureexpression of different trade-offs.