Titlebook: Advances in Spatial Databases; Third International David Abel,Beng Chin Ooi Conference proceedings 1993 Springer-Verlag Berlin Heidelberg

勛章

Strong integration of spatial domains and operators in a relational database system,e spatial database system, integrating in a single model both alphanumeric and geometric data, is discussed. Such a database system, GéoSabrina, has been developed as an extension of an already existing relational database system. The system supports spatial data with corresponding spatial operators

Altitude

The transformation technique for spatial objects revisited, deletion and proximity queries can be carried out with reasonable performance. The basic idea is to transform the bounding boxes into points in higher dimensional space in order to apply data structures for points which are better understood and easier to handle. Even though the basic concept of th

去掉

A paging scheme for pointer-based quadtrees,e they support the efficient computation of traditional GIS spatial analysis algorithms. While the quadtree has many representations, the . has become the standard. Initially thought to be more space efficient than traditional . quadtree representations, its main operational virtue has been its abil

homocysteine

A hierarchical spatial index for cell complexes,ting of general .-dimensional spatial objects described by .-dimensional cell complexes. The new hierarchical spatial index, called a cellular .-tree, generalizes similar structures developed for planar maps, and is defined as a recursive subdivision of a universe containing the cell complex into re

Goblet-Cells

FISC

NAUT

A spatial data model and a topological sweep algorithm for map overlay,rs a new map by using an overlay function. Existing algorithms for vector-based map overlay operations suffer from one or more of the following disadvantages: lacking generality, inefficiency or poor adaptability to existing GIS-Systems. Furthermore only few proposals for parallel implementations of

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紅腫

Database support for multidimensional discrete data, the image, or they are designed as specialized systems providing sophisticated imaging functionality, but no general data modeling and retrieval capabilities; none of them provides full modeling support for arbitrary pixel data types. Still more important, no system offers enough data independence

北極人

From extensible databases to interoperability between multiple databases and GIS applications,w that its generalisation in an open distributed environment well supports the exchange of either (foreign) data or of (foreign) operations between multiple geo-databases and several GIS application systems and in particular between databases and application-specific computation services. This is a