基于Oracle Spatial的SVG发布的研究与实现

RESEARCH AND REALIZATION OF SVG PUBLICATION BASED ON ORACLE SPATIAL

SVG是一种描述二维图形的语言,其众多的优点受到WebGIS界的广泛关注,然而如何利用空间数据管理引擎来动态发布该格式的图形一直没有得到解决。提出了在Oracle Spatial上发布SVG的解决方案,详细介绍了特殊空间数据对象坐标转换、SDO_GEOMETRY与SVG的对应关系及转换思路、投影坐标与屏幕坐标之间的变换等关键技术。

SVG is a language for describing two-dimensional graphics. It is attention-greeting in WebGIS domain for its different merit. However, the problem that how to dynamically publish SVG graphics by the spatial data management engine is not settled. A method is proposed to publish SVG on Oracle Spatial. Some important technologies are introduced, such as the special spatial object coordinates transform, the relationship between SDO_GEOMETRY and SVG,the method to transform SDO_GEOMETRY to SVG, the switch from projection coordinates to screen coordinates.