Spatial Data Databases can store data types such as lines,polygons,in addition to raster images allows relational databases to store and retrieve spatial information Queries can use spatial conditions (e.g.contains or overlaps). queries can mix spatial and nonspatial conditions ■ Nearest neighbor queries,given a point or an object,find the nearest object that satisfies given conditions. Range queries deal with spatial regions.e.g.,ask for objects that lie partially or fully inside a specified region. Queries that compute intersections or unions of regions. Spatial join of two spatial relations with the location playing the role of join attribute. Database System Concepts-7th Edition 24.17 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 24.17 ©Silberschatz, Korth and Sudarshan th Edition Spatial Data ▪ Databases can store data types such as lines, polygons, in addition to raster images • allows relational databases to store and retrieve spatial information • Queries can use spatial conditions (e.g. contains or overlaps). • queries can mix spatial and nonspatial conditions ▪ Nearest neighbor queries, given a point or an object, find the nearest object that satisfies given conditions. ▪ Range queries deal with spatial regions. e.g., ask for objects that lie partially or fully inside a specified region. ▪ Queries that compute intersections or unions of regions. ▪ Spatial join of two spatial relations with the location playing the role of join attribute