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Spatial database management has become an important subarea§of current database research. Research in this area is often§characterized by interdisciplinary cooperation: computer§scientists work with geographers andenvironmental§scientists to provide better access to spatial databases of§steadily increasing size. After the First Symposium on Large§Spatial Databases (SSD '89) was held in Santa Barbara,§California, in 1989 (and its proceedings published as Volume§409 of this series), a second symposium (SSD'91) was held in§Zurich, Switzerland. This proceedings volume contains the§papers presented at SSD '91. Topics include spatial data§models and access methods, performance studies, geometric§algorithms, spatial query languages and user interfaces,§geographic information systems, and object-oriented§techniques.