虚拟地图

元数据MA服务器是地图MA服务器的目录服务器，负责虚拟地图的生成、提供空间元数据的注册与变更服务；

Metadata MA server as directory of Map MA Server provides service of generating virtual map , registering metadata , and updating metadata .

目前国内外的相关研究主要集中于对传统的二维地图和固定地图的研究，对三维虚拟地图和可旋转地图的研究还相对较少。

Current and relevant research focused mainly on the traditional two-dimensional maps and static map , and study to three-dimensional virtual map and rotated map relatively less .

但中国的用户却发现国内地图比国外地图更加详细。部分原因在于，他们的数据是由制作汽车导航系统、虚拟地图和卫星影像的中国地图公司高德软件有限公司（AutoNaviHoldings）提供的。

Customers in China , however , found more detailed maps covering their country than those overseas , in part because their data is provided by AutoNavi Holdings , a Chinese mapping company that makes auto navigation systems as well as virtual maps and satellite images .

模拟与虚拟地图符号及地理虚拟空间的数学定义

Mathematical Definitions for Imitative Map Symbol , Virtual Map Symbol and Geo-Cyberspace

在里面一张电脑化的虚拟地图涵盖了城市上方和下方地面结构的每一处角落，包括整个地铁系统前所未有的细节。

Inside , a computerized map of virtually every city 's structure above and below ground , including the entire subway system in unparalleled detail .

地图上，从某些网站合并与数据从另一个来源，使信息屋售予在某方面他们可以制造使用虚拟地图。

Maps from a certain website are merged with data from another source so that information about houses for sale in a certain area could be produced using a virtual map .

基于VRML的虚拟社区与二维地图互响应的研究

Dynamic Inter-response Between Virtual Community and 2D Digital Map Based on VRML

虚拟现实技术和因特网技术在现代地图学中的应用使赛博空间在虚拟地图中得以构造，从而使地图由原来的平面变成了含有属性的多维空间环境。

The application of virtual reality technology and internet technology makes the idea of building cyberspace in virtual map become possible . It changes the map from two dimension environment to many dimension spatial environment which includes property .

实现虚拟城市应用的其中一个基本问题就是如何有效的存储、读取、检索和更新大规模的场景数据，以及把虚拟场景和矢量地图、文字属性以及栅格数据进行统一管理。

The basic problems in realizing Virtual City are how to store , load , query and update large-scale 3D models efficiently , and how to manage 3D Model with the vector-graph , text attribute and raster data .