Efficient Web-based access to multiple geographic databases through automatically generated wrappers

Information Processing & Management

Yin

et al. 2005

In order to organise and manage geospatial and georeferenced information on the web making them convenient for searching and browsing, a digital portal known as G-Portal has been designed and implemented. Compared to other digital libraries, G-Portal is unique for several of its features. It maintains metadata resources in XML with flexible resource schemas. Logical groupings of metadata resources as projects and layers are possible to allow the entire metadata collection to be partitioned differently for users with different information needs. These metadata resources can be displayed in both the classification-based and map-based interfaces provided by G-Portal. G-Portal further incorporates both a query module and an annotation module for users to search metadata and to create additional knowledge for sharing respectively. G-Portal also includes a resource classification module that categorizes resources into one or more hierarchical category trees based on userdefined classification schemas. This paper gives an overview of the G-Portal design and implementation. The portal features will be illustrated using a collection of high school geography examination-related resources.

Section: Related Workmentioning

confidence: 99%

On organizing and accessing geospatial and georeferenced Web resources using the G-Portal system

Information Processing & Management

Yin

et al. 2005

“…There have been several ongoing research efforts making Web content available to users in a more structured and organized way [1,2,4,5,7,8,[12][13][14][15][16]18]. In this section, we give a brief review of those that are most closely related to our G-Portal project.…”

Section: Related Workmentioning

confidence: 99%

A Java-based digital library portal for geography education

Science of Computer Programming

et al. 2004

G-Portal is a Java-based digital library system for managing the metadata of geography related resources on the Web. In addition to providing a flexible repository subsystem to accommodate metadata of different formats using XML and XML Schemas, G-Portal organizes metadata into projects and layers, and supports an integrated and synchronized classification and mapbased interfaces over the stored metadata. G-Portal also includes a classification subsystem that creates category structures and classifies metadata resources into categories based on userspecified classification schemas. Furthermore, G-Portal users can annotate resources and make their annotations available to others. In this paper, we describe the design and implementation of G-Portal and elaborate how Java is used to implement its features. G-Portal has been designed to be modular and some of the modules can be used as stand-alone tools. In this paper, we use UML notation to describe the detailed design of G-Portal and highlight some of the design decisions.

“…For example, System for the Optimized Selection of Spatial Data (SOS-SD) [8] aims to investigate the possibility of building a data warehouse application that retrieves preliminary data from different GDLs and integrate them into a single database for user inquiry. MEADOW (Middleware for Efficient Web-based Access to Databases through OpenGIS Wrappers) [1] adopts the CORBA object model and OpenGIS standard and proposes an architecture for accessing multiple geographic databases.…”

Section: Related Workmentioning

confidence: 99%

G-Portal

Goh

Proceedings of the 2nd ACM/IEEE-CS Joint Conference on Digital Libraries

et al. 2002

As the World Wide Web evolves into an immense information network, it is tempting to build new digital library services 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 georeferenced content found on the World Wide Web. G-Portal adopts a map-based user interface to visualize and manipulate the distributed geospatial and georeferenced content. Annotation capabilities are supported, allowing users to contribute 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 capabilities of G-Portal.