Results 251 to 260 of about 3,193,900 (299)

Research of spatial database based on spatial database engine

SPIE Proceedings, 2007
With increasing demands of GIS applications system in a complex, integrated, and other areas, the spatial data are required rapid growth for the systems, and users are more and more on the demand spatial data. The method which traditional documents express spatial data is obviously unable to meet these needs.
Mengquan Wu, Wuihong Cui, Xiaodong Yang, Yongqi Huang   +3 more
openaire   +1 more source

Ranking in spatial databases

1995
An algorithm for ranking spatial objects according to increasing distance from a query object is introduced and analyzed. The algorithm makes use of a hierarchical spatial data structure. The intended application area is a database environment, where the spatial data structure serves as an index.
Gísli R. Hjaltason, Hanan Samet
openaire   +2 more sources

dedale, a spatial constraint database

1998
This paper presents a first prototype of a constraint database for spatial information, dedale. Implemented on top of the O2 DBMS, data is stored in an object-oriented framework, with spatial data represented using linear constraints over a dense domain. The query language is the standard OQL, with special functions for constraint solving and geometric
Grumbach, Stéphane, Rigaux, Philippe, Scholl, Michel, Segoufin, Luc   +3 more
openaire   +3 more sources

Spatial Databases

2005
Section I: Modeling and Systems, Chapter I. Survey on Spatial Data Modeling Approaches, Chapter II. Integrating Web Data and Geographic Knowledge into Spatial Databases, Section II: Indexing Techniques, Chapter III. Object-Relational Spatial Indexing, Chapter IV. Quadtree-Based Image Representation and Retrieval, Chapter V.
Shashi Shekhar, Pusheng Zhang, Sanjay Chawla   +2 more
openaire   +2 more sources

A spatial database as a component of integrated database system

Proceedings 1999 International Symposium on Database Applications in Non-Traditional Environments (DANTE'99) (Cat. No.PR00496), 2003
Huge amounts of spatial data have been accumulated by government agencies and other organizations for various kinds of applications, such as land information management, asset and facility management, resource management, and environment management. These data are typically collected, stored and used by different custodians for very specific purposes ...
Maria E. Orlowska, Xiaofang Zhou 0001
openaire   +4 more sources

Keyword Search on Spatial Databases

2008 IEEE 24th International Conference on Data Engineering, 2008
Many applications require finding objects closest to a specified location that contains a set of keywords. For example, online yellow pages allow users to specify an address and a set of keywords. In return, the user obtains a list of businesses whose description contains these keywords, ordered by their distance from the specified address.
Ian De Felipe, Vagelis Hristidis, Naphtali Rishe   +2 more
openaire   +1 more source

Communicating uncertainty in spatial databases

Transactions in GIS, 1996
As applications of spatial databases become more sophisticated and diverse, an issue of growing concern is the inability to communicate to users the uncertainty of products derived from their systems. This is important not only because users should be able to compare the quality of database outputs against the quality requirements of their tasks (in ...
Gary J. Hunter, Michael F. Goodchild
openaire   +2 more sources

Spatial Indexing for Video Databases

Journal of Visual Communication and Image Representation, 1996
Abstract Spatial reasoning techniques based on 2D string systems have been successfully applied to indexing pictorial databases. We demonstrate how similar techniques may be extended to represent video sequences, and how this representation may be compressed. Query schemes for both single frame queries, and full subsequence queries are presented. The
Kim Shearer, Svetha Venkatesh, Dorota H. Kieronska   +2 more
openaire   +1 more source

Watermarking Spatial Trajectory Database

2005
Protection of digital assets from piracy has received increasing interests where sensitive, valuable data need to be released. This paper addresses the problem of watermarking spatial trajectory database. The formal definition of the problem is given and the potential attacks are analyzed.
Xiaoming Jin, Zhihao Zhang, Jianmin Wang 0001, Deyi Li   +3 more
openaire   +1 more source

Spatial Browsing for Video Databases

1999
Time-series description data concerning a camera are expected to be automatically generated by various sensors in the near future, such as a camera's time-series positions, directions and zoom ratios so as to provide a rich environment for retrieving and browsing video data spatially.
Masatoshi Arikawa, Tetsu Kamiyama
openaire   +1 more source