On The Model Of Three-dimensional Geographic Information Symbols

Nowadays, the expressive form and the species of maps are getting more. As our acquaintance, the traditional flat map is two-dimensional model system for map symbol to express the characteristics of geographical space to color. However, with the development of computer and the three-dimensional visualization technology, as well as its geographic information systems and applications that the traditional two-dimensional plane static map symbolic model that is to sign three-dimensional dynamic model of the direction of the scene. Symbolic model of the three-dimensional study of the performance of the map function can be more powerful, better performance of the image of the map, intuitive, easy to understand.This paper from the three-dimensional visualization technology, describes the three-dimensional visualization of static and dynamic visualization. Then the two-dimensional and three-dimensional geographic information geographic information transfer mode of study, thus completing the symbolic model of the three-dimensional design, including the definition of three-dimensionally symbols, three-dimensional model of the general visual symbol variables, and symbolic model of the dynamic three-dimensional visual variable, three-dimensionally Symbolic Model selection and classification. And three-dimensional symbolic model designed according to relevant content, for a simple example of making, producing a linear path model and the model of planar trees. Finally,3D symbol library for the design and establishment of three-dimensional sign described in the three-dimensional physical model library, symbols, symbolic model texturing, and two-dimensional use of three-dimensional scene and made a three-dimensional symbol of a basic framework for the design library.