Titlebook: Advances in Spatial Databases; 4th International Sy Max J. Egenhofer,John R. Herring Conference proceedings 1995 Springer-Verlag Berlin Hei

PURG

FID

Towards a formal model for multiresolution spatial maps,tically modelled through ., and maps at different detail are related through continuous functions over such complexes. Metric aspects of multiresolution are controlled through the concept of homotopy. Two alternative multiresolution models are proposed, which are implicitly defined by a sequence of

NAVEN

Multi-Scale partitions: Application to spatial and statistical databases,lications, statistical databases also address this problem of data representation at various levels of abstraction. From these requirements, we propose a model which allows: (i) database querying without exact knowledge of the data abstraction level, (ii) the computation of multiple representations

跳脱衣舞的人

Specifying open GIS with functional languages,guages as specification and prototyping tools for Open GIS components. It shows how functional programming languages fulfill the key requirements for formal specification languages and allow for rapid prototyping in addition. So far, it has never been possible to integrate specification and prototyp

妨碍议事

Load-balancing in high performance GIS: Declustering polygonal maps,ontain gigabytes of geometric and feature data (e.g. location, elevation, soil type etc.) stored on a hierarchy of memory devices and represented as grids and large sets of polygons. The data is often accessed via range queries (like polygon clipping) and map-overlay queries. For example, a real-tim

LUT

Implementation of the ROSE algebra: Efficient algorithms for realm-based spatial data types,nes, and regions in the plane together with a comprehensive set of operations; semantics of types and operations have been formally defined. Values of these data types have a quite general structure, e.g. an object of type . may consist of several polygons with holes. All ROSE objects are . which me

Palpitation

A 3D molecular surface representation supporting neighborhood queries,rfaces of molecules become basic objects in molecular databases. We propose the neighborhood query on graphs such as molecular surfaces as a fundamental query class concerning topological information on patch adjacency. Furthermore, we suggest a patch-based data structure, called the ., first, to ef

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