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

赏钱

Qualitative and topological relationships in spatial databases,The main advantages of such a formalism are its rigorousness, clear semantics and sound inference mechanism. We also show how the formalism can be extended to include orientation and metrical information. Comparisons with other formalisms are discussed.

Invigorate

botany

Nikolaos Passalis,Anastasios Tefasan be a set of polygons with holes), (ii) have formally defined semantics, (iii) be defined in terms of finite representations available in computers, (iv) offer facilities to enforce geometric consistency of related spatial objects, and (v) be independent of a particular DBMS data model, but cooper

做事过头

Vittorio Ferrari,Martial Hebert,Yair Weissf objects to be modelled is an extension of the set of 2-dimensional objects which can be represented within the vector-based data model. The model aims to capture explicitly some important topological properties of the spatial objects, e.g. connectedness and region inclusion. The construction discu

缓和

Lecture Notes in Computer Sciencee 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

LVAD360

https://doi.org/10.1007/978-3-030-01231-1 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

门闩

Chen Liu,Jiaye Wu,Yasutaka Furukawae 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

patella

迫击炮

Lecture Notes in Computer Scienceion, whereas range queries and exact match queries are allowed for any version, present or past. The technique we present for transforming a (usual single version) B-tree into a multiversion B-tree is more general: it applies to a number of spatial and non-spatial hierarchical external access struct

渐变

Hao-Shu Fang,Jinkun Cao,Yu-Wing Tai,Cewu Lu as an index structure, and modify it to allow concurrent accesses. We investigate three different locking methods for concurrency control. The first method uses a single lock to lock the entire tree, allowing concurrent searches but only sequential updates. The second method locks the whole tree on