Large-size of spatial data and limited bandwidth of network make it restricted to transmit spatial data in WebGIS. This
paper employs IPv6 (Internet Protocol version 6), the successor of IPv4 running now, to transmit spatial data efficiently.
As the core of NGN (Next Generation Network), IPv6 brings us many advantages to resolve performance problems in
current IPv4 network applications. Multicast, which is mandatory in IPv6 routers, can make one server serve many
clients simultaneously efficiently, thus to improve capacity of network applications. The new type of anycast address in
IPv6 will make network client applications possible to find the nearest server. This makes data transmission between
client and server fastest. The paper introduces how to apply IPv6 multicast and anycast in WebGIS to transmit data
The inherent flaws in current network, especially the inadequate IP address space, make the born of NGN (Next
Generation Network). The NGN aims to enable the information sharing and inter-operation of heterogeneous networks.
As the core of NGN, IPv6 (Internet Protocol version 6), which is designed as the successor of IPv4 running now, brings
us many new features. It provides larger address space, supports mobile devices, and has built-in security policy, and so
on. Although it brings us so many advantages and the backbone of NGN also has been constructed in many countries, we
have difficulties moving to NGN. One of the main reasons is there are few killer applications for it. So what features can
be employed by GIS, and how to use them is the main content of this paper. The IPv6 certainly offers new entry to solve
some problems in GIS.