The GIS Web Portal: Beyond Data Services Tong Zhang 1,2 , Keith C. Clarke 2 , Qingfeng Guan 2 1 Department of Geography, San Diego State University 2 Department of Geography, University of California, Santa Barbara Tong Zhang Department of Geography, San Diego State University 5500 Campanile Drive San Diego, CA 92182-4493 Tel: (805) 637-6129 Email: zhangt@rohan.sdsu.edu Keith C. Clarke Department of Geography, University of California, Santa Barbara Santa Barbara, CA 93106-4060 Tel: (805) 893-7961 FAX: (805) 893-3146 Email: kclarke@geog.ucsb.edu Qingfeng Guan Department of Geography, University of California, Santa Barbara Santa Barbara, CA 93106-4060 Tel: (805) 893-2705 Email: guan@geog.ucsb.edu 1