GRID COMPUTING ENABLED GEOSPATIAL CATALOGUE WEB SERVICE Aijun Chen, Assistant Research Professor Liping Di, Associate Professor and Director Yaxing Wei, Ph.D. Student Yang Liu, Ph.D. Student Yuqi Bai, Post-doc Research Associate Laboratory for Advanced Infomation Technology and Standards (LATIS) George Mason University (GMU) 9801 Greenbelt Road, Suite 316-317, Lanham, MD 20706 achen6@,pu.edu 1difimnu.edu .ywei@mnu. edu yliu5@rrmu.edu ybai@pmu.edu Chaumin Hu, Senior Software Engineer Piyush Mehrotra, Senior Research Scientist NASA Ames Research Center MIS 258-6, Moffett Field, CA 94035 chaumin6nas .nasa. gov pivush.mehroh-a~nasa.gov ABSTRACT Geospatial Catalogue Web Service is a vital service for sharing and interoperating volumes of distributed heterogeneous geospatial resources, such as data, services, applications, and their replicas over the web. Based on the Grid technology and the Open Geospatial Consortium (0GC)’s Catalogue Service - Web Information Model, this paper proposes a new information model for Geospatial Catalogue Web Service, named as GCWS which can securely provides Grid-based publishing, managing and querying geospatial data and services, and the transparent access to the replica data and related services under the Grid environment. This information model integrates the information model of the Grid Replica Location Service (RLS)/Monitoring & Discovery Service (MDS) with the information model of OGC Catalogue Service (CSW), and refers to the geospatial data metadata standards from IS0 19115, FGDC and NASA EOS Core System and service metadata standards from IS0 19119 to extend itself for expressing geospatial resources. Using GCWS, any valid geospatial user, who belongs to an authorized Virtual Organization (VO), can securely publish and manage geospatial resources, especially query on-demand data in the virtual community and get back it through the data-related services which provide functions such as subsetting, reformatting, reprojection etc. This work facilitates the geospatial resources sharing and interoperating under the Grid environment, and implements geospatial resources Grid enabled and Grid technologies geospatial enabled. It 2!so makes resezrcher to focus on science, 2nd not cn issues with computing ability, data locztic~, processir,g and management. GCWS also is a key component for workflow-based virtual geospatial data producing. INTRODUCTION Grid computing has appeared as a new e-science information technology for addressing the formidable challenges associated with the complete integration of heterogeneous computing systems and data resources with the final aim of providing a global computing space with global resources. It brings together geographically and organizationally dispersed computational resources, such as CPUs, storage systems, communication systems, data and software sources, instruments, and human collaborators to securely provide advanced distributed high- performance computing to users among one or more Virtual Organizations (VOs) which use the Authority and Authentication security policy (Foster, 2001, 2002). Currently, the most popular and widely used Grid software for Grid researcher and scientist is named as Globus which is provided through The Globus Project. The Globus Project, cooperated with Global Grid Forum (GGF), proposes the Open Grid Service Architecture (OGSA), Open Grid Service Infrastructure (OGSI) for Globus 3.0 and Web Service Resource Framework (WSRF) for Globus 4.0 as the guidelines and specifications of system design and implementation to develop fundamental technologies needed to ASPRS 2005 Annual Conference Baltimore, Maryland o March 7-11,2005