G-Portal: a map-based digital library for distributed geospatial and georeferenced

As the World Wide Web evolves into an immense informa-tion network, it is tempting to build new digital library ser-vices and expand existing digital library services to make use of web content. In this paper, we present the design and implementation of G-Portal, a web portal that aims to provide digital library services over geospatial and georef-erenced content found on the World Wide Web. G-Portal adopts a map-based user interface to visualize and manip-ulate the distributed geospatial and georeferenced content. Annotation capabilities are supported, allowing users to con-tribute geospatial and georeferenced objects as well as their associated metadata. The other features included in G-Portal’s design are query support, content classification, and content maintenance. This paper will mainly focus on the architecture design, visualization and annotation capabili-ties of G-Portal