基于Silverlight的矢量地图符号模型设计与实践

摘要

传统WebGIS存在着交互操作不灵活和可视化表达不丰富等问题,束缚了Web地图制图技术的进一步发展.针对这一现状,研究基于Silverlight的矢量地图符号模型设计,从网络矢量地图符号化框架入手,采用SOA思想设计开放灵活通用的矢量地图点状、线状和面状符号模型,最后结合Silverlight4.0和WCF服务进行网络矢量地图符号库的加载和显示实践,通过地图符号库在线绘制的时间测试,验证基于Silverlight的矢量地图符号模型的设计与实践,在提高可视化效果的同时满足WebGIS的交互响应要求.%Traditional WebGIS is weak in inflexible interaction and rather simple expression, which restricts web cartographical technology from further development. To deal with this problem, the design of vector map symbol model based on Silverlight is studied. A vector map symbolization web framework is built and the open smart universal vector map point, line, and area symbol model is proposed based on SO A theory. Finally, a practice with loading and showing vector map symbol library with Silverlight 4. 0 and WCF is made. From the analysis of performance based on time computing of map symbol library online rendering, the design and practice of vector map symbol model based on Silverlight that can be proved to enhance the visual impression and meet with the interaction and response requirement of WebGIS.