基于SVG的WebGIS的研究与实现

Study and realization of SVG-based WebGIS

传统的WebGIS大多数是基于XML的语言规范,对图像的描述主要是采用像PNG、JPEG等图像格式那样逐像素进行描述,存在对图像描述复杂、处理不方便和难以控制等问题。为此采用SVG矢量图构建WebGIS图,并利用SVG提供的DOM编程接口,使用JavaScript脚本语言对SVG进行开发,实现其交互功能,克服了传统WebGIS的缺点,并具有系统轻便、简单、传输速度快、交互强等特点。同时SVG的动画和交互功能也使依托SVG技术构建的WebGIS更加负有表现力、更加生动。

The traditional WebGIS are mostly based on XML standard, it describes the images by the image format ofPNG, JPEG and so on. The problem is complexity when image described in WebGIS, discommodiousnes to maage, and difficult to control. A method is brought to construct WebGIS map by SVG vector graph, In order to realize its mutual control and the WebGIS system, the character of SVG is borrowed, the interface of DOM program is used which is supplied by SVG at client and u.se the script language to develop SVG, It makes the WebGIS has more expressive force and more lifelikeness.