| FRAMEWORKS FOR GENERALIZATION CONSTRAINTS AND OPERATIONS BASED ON OBJECT-ORIENTED DATA STRUCTURE IN DATABASE GENERALIZATION |
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| 作者姓名： | LIU Yaolin Martien Molenaar AI Tinghua LIU Yanfang |
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| 作者单位： | Professor,Ph.D candidate,School of Resou rce and Environment Science,Wuhan University,129 Luoyu Road,
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| 基金项目： | ProjectsupportedbytheInternationalInstituteforAerospaceSurveyandEarth
Science，MinistryofEducationandtheStateBureauofSurveyingandMapping. |
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| 摘 要： | 1 ＩｎｔｒｏｄｕｃｔｉｏｎＤａｔａｂａｓｅｇｅｎｅｒａｌｉｚａｔｉｏｎｃａｎｂｅｃｏｎｓｉｄｅｒｅｄａｓｔｈｅｔｒａｎｓｆｏｒｍａｔｉｏｎｏｆｔｈｅｃｏｎｔｅｎｔｏｆａｓｐａｔｉａｌｄａｔａｂａｓｅｆｒｏｍｈｉｇｈｒｅｓｏｌｕｔｉｏｎ (ｗｉｔｈｍｏｒｅｄｅｔａｉｌ)ｔｏａｌｏｗｅｒｒｅｓｏｌｕｔｉｏｎ (ｗｉｔｈｌｅｓｓｄｅｔａｉｌ)ｔｅｒｒａｉｎｒｅｐｒｅｓｅｎｔａｔｉｏｎ(Ｍｏｌｅｎａａｒ ,1 996 ) .Ｉｎｏｔｈｅｒｗｏｒｄｓ ,ｔｈｉｓｔｒａｎｓｆｏｒｍａ ｔｉｏｎｉｓｄｅｅｍｅｄａｓｃｈａｎｇｉｎ…
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| 收稿时间： | 26 November 2005 |
Frameworks for generalization constraints and operations based on object-oriented data structure in database generalization |
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| LIU Yaolin,Martien Molenaar,AI Tinghua,LIU Yanfang.FRAMEWORKS FOR GENERALIZATION CONSTRAINTS AND OPERATIONS BASED ON OBJECT-ORIENTED DATA STRUCTURE IN DATABASE GENERALIZATION[J].Geo-Spatial Information Science,2001,4(3):42-49. |
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| Authors: | Liu Yaolin Ph D candidate Martien Molenaar Al Tinghua LIU Yanfang |
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| Institution: | LIU Yaolin Martien Molenaar AI Tinghua LIU Yanfang |
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| Abstract: | The constraints and the operations play an important role in database generalization.They guide and govern database generalization.The constraints are translation of the required conditions that should take into account not only the objects and relationships among objects but also spatial data schema (classification and aggregation hierarchy) associated with the final existing database.The operations perform the actions of generalization in support of data reduction in the database.The constraints in database generalization are still lack of research.There is still the lack of frameworks to express the constraints and the operations on the basis of object_oriented data structure in database generalization.This paper focuses on the frameworks for generalization operations and constraints on the basis of object_oriented data structure in database generalization.The constraints as the attributes of the object and the operations as the methods of the object can be encapsulated in classes.They have the inheritance and polymorphism property.So the framework of the constraints and the operations which are based on object_oriented data structure can be easily understood and implemented.The constraint and the operations based on object_oriented database are proposed based on object_oriented database.The frameworks for generalization operations,constraints and relations among objects based on object_oriented data structure in database generalization are designed.The categorical database generalization is concentrated on in this paper. |
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| Keywords: | constraints database generalization operation spatial object hierarchy |
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