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Geographic database systems, known as geographic information systems (GISs) particularly among non-computer scientists, are one of the most important applications of the very active research area named,spatial database systems. Consequently following the database approach, a GIS hag to be seamless, i.e. store the complete area of interest (e.g. the whole,world) in one database map. For exhibiting acceptable performance,a seamless GIS hag to use spatial access methods. Due to the complexity,of query and analysis operations on geographic objects, state-of-the-art computational geomeny concepts have to be used in implementing these operations. In this paper, we present GIS operations based on the compuational geomeny technique plane sweep. Specifically, we show how the two ingredients spatial access methods,and computational,geomeny,concepts can be combined,für improving,the performance,of GIS operations. The fruitfulness of this combination is based on the fact that spatial access methods,efficiently provide the data at the time when computational geomeny algorithms need it für processing. Additionally, this combination avoids page faults and facilitates the parallelization of the algorithms.

The combination of spatial access methods and computational geometry in geographic database systems