Recent advances in geospatial Web services and Service-Oriented Architecture (SOA) are shifting geospatial data and analysis from the everything-locally-owned-and-operated paradigm to the everything-shared-over-the-Web paradigm. By embracing geospatial content and capabilities within the context of SOA, we have developed a Geospatial Online Analysis System (GeOnAS), a fully extensible system designed for discovery, retrieval, analysis, and visualization of geospatial and other network data based on Web services. GeOnAS also is built as an open and collaborative system capable of integrating distributed services to implement all required functions. The more users are involved, the more powerful the system becomes. GeOnAS provides values in its overall efficiency of integrating and analyzing distributed geospatial data over the Web.