The Application of Prefetching in WebGIS
In current Web-based Geographic Information System "WebGIS", with the access request of users, lots of large data, such as spatial data, are usually transferred from remote servers to clients, which often makes data transmission delayed, prolongs user response time and leads to low efficiency. Prefetching is originally used in operation systems to improve cache performance, however, in WebGIS, proper prefetch policies can be utilized to reduce the latency perceived by users and achieve higher efficiency in clients. The paper analyzes several prefetch policies and makes a discussion for its application to WebGIS so that the perfor- mance of WebGIS can be meliorated.