CAD

This Guide to Good Practice is designed to provide direction for individuals and organizations involved in the creation, maintenance, use, and long-term preservation of computer-aided drafting or computer-aided design (CAD) resources in the humanities.

ACKNOWLEDGEMENTS

vii

SECTION 1: INTRODUCTION

1

(4)

1.1 Aims and objectives

1

(1)

1.2 Other Guides in the series

2

(1)

1.3 How to use this Guide

3

(2)

SECTION 2: A BRIEF INTRODUCTION TO CAD FOR THE HUMANITIES

5

(22)

2.1 An introduction to CAD

6

(1)

2.2 How CAD developed

6

(1)

2.3 CAD programs and important CAD features

7

(1)

2.4 Two-dimensional models

8

(1)

2.5 Three-dimensional drawings and models

9

(9)

2.6 Multiple CAD files

18

(1)

2.7 Connected data tables

19

(1)

2.8 CAD, virtual reality and other drawing programs

20

(1)

2.9 CAD and GIS

21

(6)

SECTION 3: CAPTURING DATA FOR CAD PROJECTS

27

(17)

3.1 Common sources of CAD data

27

(1)

3.2 Precision and accuracy

27

(2)

3.3 Survey, data density and CAD

29

(3)

3.4 Field survey for CAD models

32

(6)

3.5 Direct object scanning

38

(1)

3.6 Retrospective conversion to CAD from maps, plans and drawings

38

(3)

3.7 Photographs

41

(1)

3.8 Conclusions

42

(2)

SECTION 4: CAD SYSTEMS

44

(6)

4.1 Choosing CAD software

44

(1)

4.2 Choosing CAD hardware

45

(1)

4.3 CAD layers, naming conventions and drawing colours

46

(2)

4.4 Indicating precision on drawings and in CAD

48

(1)

4.5 CAD data formats

49

(1)

SECTION 5: DOCUMENTING DATA FROM CAD PROJECTS

50

(16)

5.1 Why document your data7

50

(1)

5.2 Documentation for projects

51

(2)

5.3 Documenting the conventions

53

(1)

5.4 Documenting field data capture

54

(2)

5.5 Documenting off-site data capture

56

(1)

5.6 Documenting CAD models

57

(2)

5.7 Documentation case study: Symon's Castle

59

(7)

SECTION 6: GOOD PRACTICE IN MANAGING CAD MODELS FOR DIGITAL ARCHIVING

66

(10)

6.1 Introduction

66

(1)

6.2 The archival need

67

(1)

6.3 Planning for the creation of digital data

67

(1)

6.4 Storing digital datasets

68

(2)

6.5 Digital archiving strategies

70

(2)

6.6 Metadata for resource discovery

72

(2)

6.7 Metadata case study

74

(2)

SECTION 7: DEPOSITING DATA FROM A CAD PROJECT IN A DIGITAL ARCHIVE

76

(6)

7.1 Possible digital archive facilities

76

(1)

7.2 Requirements for depositing data with archives

76

(1)

7.3 General considerations when depositing data

77

(2)

7.4 Depositing CAD data with the Archaeology Data Service

79

(3)

BIBLIOGRAPHY AND WEB REFERENCES

82

(3)

GLOSSARY

85

(4)

APPENDIX 1: ACCURACY AND INSTRUMENT TESTS

89

(1)

APPENDIX 2: THE CSA LAYER-NAMING CONVENTION

90

(3)

APPENDIX 3: THE ENGLISH HERITAGE LAYER-NAMING CONVENTION

93

(7)

APPENDIX 4: STANDARDS IN ARCHAEOLOGY

100

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