基于SVG的多尺度空間數(shù)據(jù)組織和表達(dá)
[Abstract]:SVG is a scalable vector graphics language description specification based on XML language, which is designed to meet the needs of the development and application of Internet. It combines the advantages of vector graphics, raster images and plain text. It can well meet the requirements of GIS for spatial multi-scale data graphic display. Firstly, this paper analyzes the technical characteristics of SVG and the possibility of its application in WebGIS. At the same time, the organization method of SVG applied to multi-scale spatial data is studied. The idea of LOD layering is introduced to set the display level parameters of layer and figure, so as to make it accord with the needs of human visual scaling. The SVG technical specification also provides a good mechanism to implement the hierarchical organization of data. The g element defined in the specification is suitable for expressing the concept of "layer" in spatial data organization. Therefore, it can be applied to the hierarchical organization of multi-scale spatial data, and the coding scheme of map, layer and figure object is also given. Then the paper analyzes the realization technology of SVG applied to multi-scale data expression. Firstly, it introduces the map data source transformation and compression method. The emphasis is to give the realization scheme of spatial information visualization and multi-scale data representation. The document organization involved in the middle, the concrete expression realization and the relation between the multi-scale data are studied in detail. The display operation of each layer or figure element is controlled by the script language JavaScript. Realization in multi-scale representation. Finally, the realization of these functions by SVG is summarized and analyzed. The lightweight prototype system of WebGIS platform based on SVG is developed by using the above key technologies, and the feasibility of the technical scheme is verified.
【學(xué)位授予單位】:首都師范大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:P208
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