This monograph, which is the first book focusing on Digital Oil & Gas Pipeline, introduces the author long-term research and practice on this topic. It introduces the latest research on the core technologies of the Digital Oil & Gas Pipeline, such as WebGIS, GIS Web Services, pipeline supervisory control and data acquisition (SCADA), OLE for Process Control, networked virtual reality, and Extensible 3D. The keys to the Digital Oil & Gas Pipeline, including pipeline spatial data model, pipeline WebGIS, integrity of pipeline SCADA and pipeline GIS, pipeline networked virtual reality system, are also elaborated. The knowledge and experience delivered by this monograph will provide a useful reference for readers from the industries in Oil & Gas Storage and Transportation, pipeline automation, GIS, Virtual Reality, and related fields.