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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Choi, A. Luk, W.S. |
| Copyright Year | 1990 |
| Description | Author affiliation: Sch. of Comput. Sci., Simon Fraser Univ., Burnaby, BC, Canada (Choi, A.; Luk, W.S.) |
| Abstract | A bi-level object-oriented data model together with a user query language called OFQL is designed which can support applications like GIS (geographic information systems). The data model is divided into two layers, the higher-level data model and the lower-level data model. The higher-level data model or the geographic object data model primarily consists of the geographic objects and a set of semantic spatial functions through which the topological relationships of the geographic objects are defined or derived. The lower-level data model or the geometric object data model has geometric objects which are the actual spatial representations of the geographic objects in the higher-level data model. It also has a set of geometric functions that retrieve, manipulate, and compute for geometric objects. The general architecture of a GIS system using this data modeling approach consists of two modules: the query processor and the function implementor. With the OFQL user-interface, the user is able to pose queries of a geographic nature without knowing the details of the spatial representation and computation of the geographic objects.< |
| Starting Page | 238 |
| Ending Page | 244 |
| File Size | 717981 |
| Page Count | 7 |
| File Format | |
| ISBN | 0818620544 |
| DOI | 10.1109/CMPSAC.1990.139357 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1990-10-31 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Data models Geographic Information Systems Object oriented modeling Spatial databases Database languages Design automation Object oriented databases Geoscience Application software Relational databases |
| Content Type | Text |
| Resource Type | Article |
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