Titlebook: Advances in Spatial Databases; 2nd Symposium, SSD ‘ Oliver Günther,Hans-Jörg Schek Conference proceedings 1991 Springer-Verlag Berlin Heide

Substitution

有限

熟练

Markus Oberweger,Mahdi Rad,Vincent Lepetit, the data model is very close to a functional data model. The model serves as the formal foundation of the VIMSYS (Visual Information Management SYStem) project, which aims to perform content and similarity based query processing of large image repositories.

起皱纹

Bo Zhao,Bo Chang,Zequn Jie,Leonid Sigal the development of a prototype relational image-based geographical information system. The application of this system is illustrated using a case study for land and resource management in the semi-arid zone of Australia.

Promotion

isotope

绿州

Vittorio Ferrari,Martial Hebert,Yair Weisserarchical) complex objects in a way compatible with the referential integrity feature of relational DBMS‘s, the possibility to define dynamically any complex object with a network structure and to navigate through such structures. The language also introduces abstract data types on scalar or structured columns, and on complex objects themselves.

coagulate

The management of the ambiguities in a graphical query language for geographical information systemal query language for geographical databases. We point out the various ambiguities due to the merging phase. These ambiguities mainly derive from the semantics of the operators and from the different levels of manipulation (logical or geometrical). We present the solutions we adopted in the context of the CIGALES project.

高歌

Geo-SAL: A query language for spatial data analysis,SAL being developed for spatial data analysis purposes..In addition to facilities needed for representation and retrieval of spatial data, Geo-SAL includes primitives and structures which permit the solution of complex, multi-step spatial analysis problems within a coherent, declarative language.

tackle

Performance comparison of segment access methods implemented on top of the buddy-tree,s methods can be judged with respect to their individual techniques. Besides the different versions of buddy-trees, the R*-tree (an improved approach of the R-tree) and the grid file participate in our experimental performance comparison.