15057 ca dcomputer

Is 15057:2001
ISO/TR 10127:1990
Indian Standard
COMPUTER-AIDED DESIGN (CAD) TECHNIQUE —
USE OF COMPUTERS FOR THE PREPARATION OF
CONSTRUCTION DRAWINGS
ICS :01.100.30:35.240.10
Q BIS 2001
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
November 200 I Price Group 7

Drawings Sectional Committee, BP 24
NATIONAL FOREWORD
This Indian Standard which is identical with ISO/TR 10127:1990 ‘Computer-Aided Design (CAD) Technique
— Use of computers for the preparation of construction drawings’ issued by the International Organization for
Standardization (1S0) was adopted by the Bureau of Indian Standards on the recommendation of Drawings
Sectional Committee and approval of the Basic and Production Engineering Division Council.
This standard will identify major differences between the manual drawing practice and the CAD Technique in
the construction industry.
The text of 1S0 Standard has been approved as suitable for publication as Indian Standard without deviations.
In this adopted standard, certain terminology and conventions are not identical to those used in Indian
Standards. Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as
‘Indian Standard’.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to
use a full point (.) as the decimal marker.
In this adopted standard, reference appears to certain International Standards in ‘Bibliography’ for which Indian
Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed
below along with their degree of equivalence for the editions indicated:
International
Standard
1S0 2382-1:1984
(Superseded by ISO/lEC
2382-1: 1993)
ISO 2382-4:1987
1S0 2382-5:1989
1S0 7498:1984
ISO 7942:1985
1S09179-1:1988
Corresponding
Indian Standard
IS 14692 (Part 1):1999 Information technology
— Vocabulary: Part 1 Fundamental terms
IS 13557 (Part 4):1993 Information processing
systems — Vocabulary : Part 4 Organization of
data
IS 13557 (Part 5):1993 Information processing
systems — Vocabulary: Part 5 Representation of
data
IS 12373 (Part 1):1987 Basic reference model of
open systems interconnection for information
processing systems: Part 1
IS 12369:1987 Specification for graphical Kernel
system for computer graphics
1S/1S0 9179-1:1988 Technical drawings —
Numerically controlled draughting machines:
Part 1 Vocabulary
Degree of
Equivalence
Identical
do
do
do
do
do
The concerned Sectional Committee has reviewed the provisions of the following 1S0 Standards referred in this
adopted standard and has decided that they are acceptable for use in conjunction with this standard:
International Title
Standard
1S0 2382-9:1984 Data processing — Vocabulary — Part 09: Data communication
1S02382-12:1988 Information processing systems — Vocabulary — Part 12: Peripheral equipment
(Continued on third cover)

IS 15057:2001
lSO/TR 10127:1990 Indian Standard
COMPUTER-AIDED DESIGN (CAD) TECHNIQUE —
USE OF COMPUTERS FOR THE PREPARATION OF CONSTRUCTION DRAWINGS
1 Definition of Drawings
Design documentation, including drawings, is the information required to produce a producG in the
construction industry this is a building projector a civil work, A drawing is conventionally viewed as an
analogical presentation of information; normally a graphical two-dimensional representation in plan and
elevation view of a product. There are various levels of abstraction for the product starting at the concept
drawings and proceeding to drawings for designing, production, manufacturing, consuuction,
administration, maintenance, etc. In addition to the graphical information (lines) in the form of drawings
are the xelated alphanumeric data (words) in the form of specifications and a wide accumulation of
discipline knowledge consisting of codes, company standards, discipline conventions, and design and site
changes. These may or may not be represented in the design documentation. In many countries, the
specifications, or written part of the construction documentation, take precedent over the “drawings” or
graphical part. Therefore one cannot conceive of drawings as simply the graphical representation but must
also include all the information necessary to produce a product.
In most countries, it is generally accepted that concept drawings and working drawings serve the function
of testing design concepts and recording design decisions, respectively, and that drawings for production
and manufacturing axea communication tool used to transfer information from the designer to the
1

IS 15057:2001
lSO/TR 10127:1990
constructor and to the fabricator. Drawings are recording devices and information transfer tools; therefore
one must not view drawings as an end in themselves, but rather as a growing information base of design
and site decisions used in the process of building a product.
In the manual world it is extremely difficult to imagine a static drawing as a growing information base; a
major dilemma with paper, erasers, and pens. The existing drawings are always supplemented by
additional information: speciilcations, detail lists, manufacturers guides, codes, and associated standards;
all of which augment the information provided on a set of drawings. This information also includes
updates to the drawings, new drawings, revisions, design change orders, site change orders, and
fabrication drawings; all of these forming part of the ever growing information database. In the past, this
information has been handled reasonably well by the construction industry; although an awkward
prccedure, it has served the construction indusuy well over the past millenia
There are, however, two major problem mess with these methods that take an inordinate amount of time:
Cross-refernng information and updating information. This is where the CAD Technique w-illprovide a
valuable tool for the designer, fabricator, and the constructor, not to mention the initiator and final recipient
in the design-build cycle, the owner.
l%e word “drawing” was derived from “withdrawing” as in “withdrawing information”, so “drawing”
could mean both the graphical and associated alphanumeric information this has considerable more
meaning and importance when dealing with computers. SpectiIcally, computer-aided design draughting has
precipitated a new question regarding the word “drawing”: - can a database be a drawing, or the reverse, is
a drawing a database?
Computer technology has also introduced new definition problems with terms such as: Computer-Aided
Design (CAD), Geometric Modelling, Computer-Aided Design Draughting (CADD), and Computer-Aided
Engineering (CAE).
Computers have introduced new parameters to the design process: a dynamic ability to rapidly access and
change information and a possibility to cross-mfertmce related pieces of information in art easy manner.
These are not new features recently introduced by CAD, but rather new opportunities to deal with
drawings in the conventional definition. In addition, the CAD technique will introduce different ways to
access building information and will develop new techniques for using the information, many of which are
unknown at this time.

Is 15057:2001
lSO/TR 10127:1990
To assist in the explanation of these concepts, Figuxe 1 has been &veloped to outline the layout of a
drawing system using the CAD Technique. This has an analogy to conventional draughting practice: the
database is the design representation in the mind of the designer(s), the fdtecs are the manual tasks to
produce specific information needed for evaluation or bidding procedures, the drawings are the output
product of the design cycle.
Building Information
*codes Ret)resentation
l Conventions Drawings for design
l CompanyStandards
l Company Details
l Specifications
l Drawings
l DesignChanges
l Site Changes
Drawings for production on
11~ of the database I 1 I % 1Drawings for 1nai
-. —-. —-.—-—- . 111 t
Drawings for manufacturing
4
I Drawings for
administration and I
1 management
,
-
a
Figure 1
2 CADD Paradox
2.1 Limitations of the CAD Techniques
The limitations of the CAD Technique fall into three categories: display and resolution deficiencies,
programming limitations, and functionality uncertainty. This is not inten&d to be an exhaustive lis~ but
3

is 15057:2001
lSO/TR 10127: 1990
one that identifies major limitations. These will be overcome in the near or intermediate future by
technological advancements.
Display Deficiencies: The manual drawing process has an advantage over the automated with respect to
the amount of information displayable at one time. Five sheets of AOdrawings can be placed on a table
and the information on all can be scanned and cross-refemd. The automated system only permits one
small portion of one drawing to be displayed on the screen at one time. This disadvantage is tempo~;
with the advent of better user interface techniques, faster disks, better software design, and larger
computer memory and disk space, this will eliminate the,existing restrictions in one or two generations of
hardware and software (3 to 5 years).
Resolution Deficiencies: Manual draughting displays all information at the same resolution: different scales
are used on the drawings to present smaller details, but all the information is readable by the “average”
reader, normally * 0,1 mm on the drawing. The CAD Technique permits the information to be displayed
at different scaling factors. Therefore, one can zoom into the drawing to obtain more information, The
closer one is, the more detailed is the data, however, there is a loss of information display because the
overall picture is not there at that small scale.
Programming Limitations: Not —all of the functionality curnmtly possible with the CAD Technique can be
made available in ~ CAD systems at w point in time. Them is now enough information about automated
draughting to know what is required for most production draughting operations. CAD systems will evolve to
meet the new speciilcations of the designers, so the existing problem is temporal. All CAD software
producers will try to make all of the required features available on their machine (or they will not succeed
financially).
Functionality Uncertainty: This is a new medium - the refinement of which may take several years. How
machines will be used or what will be the best way of performing specific draughting or design functions will
not be known until several generations of hardware implementations and softwaxc programs have been
tested and refined. An example is a graphical input device - a primary function for any graphical system;
various input devices were used for decades in research and practice before the digitizing tablet and the
mouse were accepted as a universal default for simple graphical entry. This brings forth a major dilemma,
how can one sbda.rdizt before a technology has matured?
4

Is 15057:2001
lSO/TR 10127:1990
2.2 Limitations of the manual system
In the manual system the drawing was the database and standards were developed according to accepted
conventional practice. Computer technology has rendered some standards obsolete, but has also
inmoduced the need for more standardization, such as data transfer between different CAD systems. The
manual system with its associated standards do not address the complex information world of the CAD
Technique and the standards will have to be augmented.
In the conventional manual system the overall structure of the information for any consuuction project is in
the mind of the designer and the user. At times the various information components are held together in a
few documents, but there is not an integrated database of information. Computers ~ deal with
information in an ordered, logical fashion, therefore there must be a structure for this construction data.
The manual system works fine as is, but if this loosely related system of information is applied to the
CAD Technique the automated system may not perform as well as its manual counterpart.
The teaching of a designer and draughtsman is a pure heuristic function, this learning evolvesover time and
with exp&ience in the construction industry. Many of the opportunities can not be duplicated in a school
setting and must be acquired through the trial and error process. Computers have advantages over the
manual system in that the system can hold the rules and the knowledge for the user and the user can supply
the facts and details. This could greatly xwlucethe time required to assimilate the knowledge essential for
producing technical drawings, thereby producing better designers and buildings.
2.3 Similarities of both systems, manual and automated
All technical innovations alter in a small way the conventional technology. In some way the application of
the CAD Technique to technical drawings is no different from the introduction of quill pens, french
curves, dry transfers, or micro-filming for construction drawings. It optimizes some operations and
makes the overall product more efficient. It produces the same results in a different process, format, or
time frame. The product is virtually the same for technical drawings: design and fabrication documentation
to assist in the construction of buildings or civil works. The main difference with the CAD Technique is
the process by which the information is entered and recorded. Experience in the CAD industty has shown
the output product of this new technology should duplicate the output of existing technologies.
5

Is 15057:2001
lSO/TR 10127:
2.4 Differences
1990
The CAD Technique is not only the automation of the manual process, but it also provides the opportunity
to do operations in new ways that were previously impossible or cost restrictive. Solids modelling is one
clear example, another is interference checking.
Another difference between the manual and the automated world is the framework of existing computer
systems and computer standards that are currently available internationally. This includes the Initial
Graphics Exchange Specification (IGES), Graphical Kernel System (GKS), Programmers Hierarchical
Interactive Graphics System (PHIGS) and the Open Systems Intercomection (0S1). In the automated
world all of the parts of the computer system must fit together properly, in the manual world many of the
parts could exist by themselves. Any standard developed using the CAD Technique will have to relate to
existing standards, specifically IGES, GKS, PHIGS, and 0S1. Anyone purchasing CAD systems will
have to base their purchase in some way on these standards, as a major feature of a CAD system is the
ability to upgrade information and capabilities and to transfer data from one CAD system to another and
from one designer to another. This provides compatibility with other systems and reduces obsolescence of
systems purchased. With current CAD technology it would be foolhardy to purchase an orphan CAD
system, running on an orphan machine with an orphan operating system and no data transfer mechanism.
In the future this will be even more foolhardy.
Other differences between the two include updates and revisions to plans and drawings on a computer
database. This is one that directly affects the technical drawing disciplines. ‘Ile information provided by
the CAD systems can be obtained faster and more accurately by users. This enables designers,
contractors, and fabricators to access data in new, innovative ways to date untied. Information access can
be considered as instantaneous, thereby providing the users with unlimited access to correct, cross-referred
data.
New methods and standards for archiving information will also be required with the CAD Technique.
Many questions arise: How long will the data on a disk stay curren~ will one be able to edit the data in 10
years, what will the cost be of keeping this information up-tdate, etc.? These problems have been
addressed with micro-filming standards, but will have to be addressed again with the advent of the CAD
Technique.

Is 15057:2001
lSO/TR 10127:1990
2.5 Correlation between existing manualdrawing practice and CAD
There is a strong correlation between the two methods specifically the output product and the information
entry. The current CAD systems rely heavily on the sraru.squo for the entry of information into the CAD
system and for the output product. It may be decades before the method of presentation of information for
technical drawings will be chartged drastically. Research into the relationships of data for buildings
information is currently on-going and it may be years before a untied structure for building information
will be available. Other similarities exist in both the manwd and the CAD Technique system: the two
produce designs for product fabrication, provide working models for development of design schemes,
enable the designer to compare alternatives in an easy, orderly fashion, and provide a working tool for
others to access and modify. It is hoped that the advantages of the computer systems will eliminate some
manual disadvantages and that the disadvantages of the CAD Technique discussed in the previous sections
will be overcome by technological innovations.
2.6 Dilemma
The discussions of the limitations of both the manual and CAD systems in addition to the presentation of
the differences and similarities of the two and the correlation between the two has provided insight into the
dilemma of the CAD Technique. These deficiencies a.hdconflicts can lx clearly identii5ed as the following:
l
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l
l
l
l
l
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Computer technology has limitations: display and resolution
Programmingg and functionality limitations exist with the CAD Technique
There is a need for the maturing of CAD Techniques
Manual recording methods and devices do not take advantage of the newer, faster, more
efficient computer technology
Manual standards need updating
There is a lack of strong structures in manual presentation of information
Heuristic nature of learning manual system is slow and time consuming
Common formats are needed for presentation of information: “tL-swings”
Similar data entry methods nee&d for CAD systems
Them is a need for relationships with other computer standards
New opportunities are provided by CAD Technique (3D, databases, etc)
There is an ability to tmnsfer CAD data between different designers/fins
Easy updates of information exist with the CAD Technique
Strong Cross-refernng is possible with CAD information
7

Is 15057:2001
lSO/TR 10127:1990
This is clearly a dilemma for designers and professionals in the construction industry, but these points also
affect standards organizations. The new technology has not matured to a point where all of the potential
methods and techniques have been clearly identified. In general, the key dilemmas with respect to
ISO/TC 10/SC 8 and its WG 12 appear to be:
l How does ISOflC 10/SC 8 or its WG 12 fit into the CAD picture?
l How can the industry optimize the CAD Technique when not everything is known about all
aspects of the technology?
l How can the industry and ISO replace outdated methods with the newer technologies?
l How can the industry structure construction data in a better form now that the CAD Technique
is available?
l How does or can ISOflC 10/WG 4 and ISO/TC 10/SC 8/WG 12 relate to other standards such
as IGES, STEP, PHIGS, 0S1, or GKS ?
l How can ISOflC 10/SC 8/WG 12 accon&mdate, encourage, or dittct CAD Technique
development and advancement through standardization?
3 Proposed Course of Action
The CAD Technique offers many new opportunities for technical drawing. It will drastically change the
presentation of information in the upcoming decades. It may create new professions or alter existing ones.
Standardization must follow the lead in specific fields or lead the way in others.
Based on the above discussions, ISO/I’C 10/SC 8/WG 12 has identified the following as principal
concerns for standards in technical drawings:
l Adopt existing manual draughting practice and standards
l Update manual standards to reflect CAD Techniques
8

IS 15057:2001
lSO/TR 10127:1990
l Work closely with existing automated standards
l Conrnbute to standards through the development of application CAD Techniques standards
l Create Data Structure needed for the Construction Industry
l Permit area for growth of CAD Technique and standards data in a better form now that the
CAD Technique is available.
4 Work Needed that can be Addressed by ISO/TC 10/SC 8/WG 12
4.1 Develop Vocabulary for CAD Techniques
A vocabulary has been developed by ISOnC 10/SC 8/WG 12 based on the work from the Canadian, draft
British, and existing 1S0 standards. This could be augmented by the vocabulary developed by
ISOflC 10/WG 4 and ISO/TC 10/WG 5.
4.2 Allocate Categories to drawings (e.g. layers, etc.)
This would outline methods for the structuring of CAD information. To date there has been no
standardization of the assignment of layers to CAD drawings nationally or internationally. Layering is a
common technique used by the majority of CAD systems and has been in usage for over 20 years in the
construction industry, although not standardized. Allocation of categories to drawings would be the fwst
step in the development of a structure for construction information.
4.3 Develop Data Structure for CAD Information for the Construction Industry
There is a need for the proper definition of the mandatory structuring of information for construction CAD
data. This should reflect the requirements of the construction industry, should be easy to use, should be
easy to maintain, should be portable, and should assist the designer and the building owner in their tasks.
The operative words for the definition of the database at this time are:
Structured ...... hierarchic with relational ties .... centralized.
9

IS 15057:2001
lSO/TR 10127:1990
The plan is as follows:
l Find out more information from practitioners and collect more practical experience
(Canada, Denmark, Finland, France, Germany F.R., Norway, Sweden, UK, USA, etc.)
l Study existing CAD database systems ---- wait one year
l Suggest Generic Data Structure
4.4 Data Interchange standards
Standards such as IGES, STEP, GKS and PHIGS have a direct impact on the use of application standards
and visa versa. It is then necessary to follow development in other ISO and National Committees by
having representation on:
l ISOnC 10/WG 4 ~echnical Drawings, CAD Technique)
l ANSI Y 14.26M (IGES)
l ISO/TC 184 (STEP)
l ANSC X3H3. 1 (PHIGS) and ISOflC 97 (GKS)
4.5 Check use of existing categories of systems
Owing to the close association between the work of Congress International du Biitiment (CIB) W 74,
Working Group in construction information, and that of ISO/I’C 10- Technical Drawings, it has been
deemed important to investigate and compare systems to i&ntify commonalties, overlaps, and conflicts.
10

IS 15057:2001
lSO/TR 10127:1990
of Term
Note: ~efollowhg temsadtieti description should beundersto~ forexplanation of thecontextof
this Technical Report only.
Alphanumeric Code
A code according to which data are represented using an alphabetic character set [a numeric character set]
[an alphanumeric character set] (ISO 2382/4)
CAD (abbreviation)~
Computer-Aided Design
CADD (abbreviation)
Computer-Aided Design Draughting
CAE (abbreviation)
Computer-Aided Engineering
Data
A representation of facts, concepts, or instructions in a formalized manner suitable for communication,
interpretation, or processing by humans or by automatic means. (1S0 2382/1)
Database
A set of data, part or the whole of another set of data and consisting of at least one file, that is sufficient for
a given purpose or for a given data processing system.(ISO 2382/4)
Data Transfer
Moving data from one computer process to another in an ordered form.
(to) Digitize
To express or represent in a digital form data that are not discrete data.
Example: To obtain a digital representation of the magnitude of a physical quantity from an analog
representation of the magnitude. (ISO 2382/5)
1 Abbreviations such as CAD, CAE, CAM, CADD have not been defined owing to their
specific definitions in the various technical disciplines. As a result the terms can be interpreted as
meaning the Use of Computers in the Design, Engineering, Manufacturing, or Design Draughting
disciplines.
11

is 15057:2001
lSO/TR 10127:1990
Digitizing Tablet
(or Tablet)
A special flat surface with a mechanism for indicating positions thereon, normally used as a locator
(1S0 2382/13).
(magnetic) Disk
A flat circular plate with a magnetizable surface layer on which data can be stored by magnetic recording.
(1S0 2382/12)
Graphical Kernel System (GKS)
1S0 7942-1985 Information Processing Systems - Computer Graphics - Graphical Kernel System -
Functional Description: The standard provides a set of functions for computer graphics programming.
GKS defines a graphics nucleus of a graphics system. It provides a functional interface between an
application program and a configuration of graphicaJ input and output devices.
Hierarchic
A tree-structured organization of data where each record is associated with a parent record.
Information
The meaning that humans assign to data by means of the conventions used in their representation.
(1S0 2382/1)
Initial Graphics Exchange Specification (IGES)
United States standard (ANSI Y14.26) for the transfer of CAD data from one application program to
another.
Interface
A shared boundary between two functional units, defined by functional characteristics, common physical
interconnection characteristics, signal characteristics, and other characteristics, as appropriate.
NOTE - The concept involves the application of two devices having different fimctions. (ISO 2382/9)
Layer
A self-contained group of data that can be manipulated or displayed individually,
12

Is 15057:2001
lSO/TR 10127:1990
Layering
The use of layers in computer-aided design draughting.
Mouse
A hand held locator operated by moving it on a surface. (ISO 2382/13)
(adjective) Modelling
The representation of a real-life situation with an analog model. In the CAD Technique, geometric
modelling is the physical representation of objects using computer graphics techniques.
Open Systems Interconnection (0S1)
1S0 7498-1984 Information processing systems - Open Systems Interconnection - Basic reference model
for the integration of the seven levels of computer systems architecture.
Programmers Hierarchical Interactive Graphics System (PHIGS) - ISOIEC 9592
PHIGS provi&s a set of functions for definition, display, and modi.tlcarion of 2D or 3D graphical data,
definition, display, and manipulation of geomerncally related objects, modification of graphical dat~ and
the relationships between the graphical data.
Relational Database
A pointer-based database permitting the independent cross referring of data fields with other characters,
data, or databases.
(screen) Resolution
The display accuracy of an output device such as a screen, printer, or plotter normally identified as the
number of addressable points per unit length on an output device.
Software
Computer programs, procedures, rules, and any associated documentation concerned with the operation of
a data processing system. (ISO 2382/1)
Solids Modelling
A mode of representation and display showing the solid properties of a three-dimensional object.
13

1S 15057:2001
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User Interface
The management routines of a data processing system that controls the methed, devices, and management
of the input and output of dat% normally handled by the application package or the operating system.
Zooming
Progressively scaling the entire (screen) display to give the visual impression of movement of all or part of
the display group toward or away from an observer.
Note - The scaling value should be the same in all directions. (1S0 2382/13)

Is 15057:2001
lSO/TR 10127:1990
Bibliography
ISO 2382-1:1984, Data processing — Vocabulary — Part 01: Fundamental terms.
ISO 2382-4:1987, Information processing systems — Vocabulary — Part 04: Organization of data.
ISO 2382-5:1989, Information processing systems — Vocabulary — Part 05: Representation of data.
ISO 2382-9:1984, Data processing — Vocabulary — Part 09: Data communication.
1S0 2382-12:1988, Information processing, systems — Vocabulary — Part 12: Peripheral equipment.
1S0 2382-13:1984, Data processing — Vocabulary — Part 13: Computer graphics.
1S0 7498:1984, Information processing systems — Open Systems Interconnection — Basic Reference Model.
1S0 7942:1985, Information processing systems — Computer graphics — Graphical Kernal System (GKS)
functional description.
1S0 9179-1:1988, Technical drawings — Numerically controlled draughting machines — Part 1:
Vocabulary.
ISO/IEC 9592-1:1989, Information processing systems — Computer graphics — Programmer’s Hierarchical
Interactive Graphics System (PHIGS) — Part 1: Functional description.
ISO/IEC 9592-2:1989, Information processing systems — Computer graphics — Programmer’s Hierarchical
Interactive Graphics System (PHIGS) — Part 2: Archive file format.
ISO/IEC 9592-3:1989, Information processing systems — Computer graphics — Programmer Hierarchical
Interactive Graphics System (PHIGS) — Part 3: Clear-text encoding of archive file. 15

(Continuedfrom second cover)
International
Standard
ISO 2382-13:1984
ISO/IEC 9592-1:1989
ISO/IEC 9592-2:1989
ISO/IEC 9592-3:1989
Title
Data processing — Vocabulary — Part 13: Computer graphics
Information processing systems — Computer graphics — Programmer’s Hierarchical
Interactive Graphics System (PHIGS) — Part 1: Functional description
Information processing systems — Computer graphics — Programmer’s
Hierarchical Interactive Graphics System (PHIGS): Part 2 Archive file format
Information processing systems — Computer graphics — Programmer’s Hierarchical
Interactive Graphics System (PHIGS) : Part 3 Clear-text encoding of archive file

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This [ndian Standard has been developed from Doc : No. BP 24 (O157).
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