### An analysis of geometric modeling in database systemsAn analysis of geometric modeling in database systems

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 Author Kemper, Alfons ♦ Wallrath, Mechtild Source ACM Digital Library Content type Text Publisher Association for Computing Machinery (ACM) File Format PDF Copyright Year ©1987 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science Abstract The data-modeling and computational requirements for integrated computer aided manufacturing (CAM) databases are analyzed, and the most common representation schemes for modeling solid geometric objects in a computer are described. The primitive instancing model, the boundary representation, and the constructive solid geometry model are presented from the viewpoint of database representation. Depending on the representation scheme, one can apply geometric transformations to the stored geometric objects. The standard transformations, scaling, translation, and rotation, are outlined with respect to the data structure aspects. Some of the more recent developments in the area of engineering databases with regard to supporting these representation schemes are then explored, and a classification scheme for technical database management systems is presented that distinguishes the systems according to their level of object orientation: structural or behavioral object orientation. First, several systems that are extensions to the relational model are surveyed, then the functional data model DAPLEX, the nonnormalized relational model $NF^{2},$ and the database system $R^{2}D^{2}$ that provides abstract data types in the $NF^{2}$ model are described. ISSN 03600300 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 1987-03-01 Publisher Place New York e-ISSN 15577341 Journal ACM Computing Surveys (CSUR) Volume Number 19 Issue Number 1 Page Count 45 Starting Page 47 Ending Page 91

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Source: ACM Digital Library