With the development of internet technology

internet GIS have applied popularly. Distribution

interoperability

component are the main characters of internet GIS. In order to access

manage

process and distributed geodata

the paper proposes a distributed geospatial data model

which is based on hypermap concepts and distributed database principle. According to the distributed geospatial model

various geospatial data including electronic maps

images

pictures

videos

attributes

hyper documents can be constructed in the model

and they are linked by a hyper link. Every medium can have one or more hyper nodes

which link another medium. A hyper node recodes some information including the IP address and catalog of linked medium. After clicking a hyper node

we can move to another IP address and browse linked medium. Furthermore

the paper defines data structure of different type hyper nodes and discusses its implementation. An internet GIS software-GeoSurf based on the distributed hypermap geospatial model have developed by our university. Many application systems based on GeoSurf have been built. These applications has shown many advantages of the distributed hypermap geospatial data model.