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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 86
Edited by: B.H.V. Topping
Paper 84

Development of an SXF Data Identity Determination Component

K. Monobe1, S. Tanaka2, H. Furuta2 and T. Kashiyama3

1School of Project Design, Miyagi University, Japan
2Faculty of Informatics, 3Graduate School of Informatics,
Kansai University, Osaka, Japan

Full Bibliographic Reference for this paper
K. Monobe, S. Tanaka, H. Furuta, T. Kashiyama, "Development of an SXF Data Identity Determination Component", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 84, 2007. doi:10.4203/ccp.86.84
Keywords: construction CALS/EC, electronic delivery, two-dimensional CAD, SXF, originality, identity determination.

Recently, with the development of information technology, construction CALS/EC is being rapidly promoted. In order to introduce construction CALS/EC smoothly, the originality of the 2D-CAD data (SXF [1]) delivered electronically must be protected. Up until now, when determining if two CAD data are identical, one often verified them visually. This method took time, and could not determine their identity or difference very accurately. To solve this problem we have designed and developed a system, "Logical Smart", which can determine the identity of two CAD/SXF data and detect their difference, by using CAD vender's knowledge and the University's information technology.

Currently, an application that can determine the identity of two CAD data format does not exist. There are two main reasons for this. The first is that various CAD, each with different output parameters, produce various types of CAD data. The second reason is that tolerance level exists in CAD. Even for identical elements in the same design drawing, there is a possibility that the output results for each element differ from each other within the tolerance range.

In this research, during the development of Logical Smart, the following two aspects were focused on to determine the identity in CAD data. The first is aimed at SXF Ver.2.0 used in electronic delivery and determining the identity by comparing geometric data in P21 [2] or SFC format. By executing this, revision work between contractor and purchaser can be streamlined. The second uses a standard of OCF authorization sponsored by OCF when dealing with the problem of identity determination, which is the CAD-exclusive tolerance level problem. By employing this OCF authorization standard, any CAD can have its difference detected according to the same standard.

Logical Smart solved the problem of not being able to guarantee the originality of CAD data, facilitated data management, decreased the amount of time consumed in determining the identity of two CAD data, and increased the accuracy. Furthermore, Logical Smart increases efficiency of revision work carried out between users and streamlines data management. With this kind of accomplishment, we can anticipate that the system will rapidly expand in the construction field, and provide a great deal of incentives to the other industries.

Construction Information Standardization Committee, CAD Data Exchange Sub Committee, "SXF Ver.2.0 Feature Specifications", Japan Construction Information Center, 2001.
ISO10303-21, Industrial Automation System and Integration - Product Data Representation and Exchange - Part 21: Implementation Methods: Clear Text Encoding of the Exchange Structure, International Organization for Standardization, 1994.

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