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Understand the surveying engineering
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Preface
This edition has some changes in the order of chapters. Reflecting the additional complexities in electronic distance measurement, the order of presentation of surveying topics has been revised as follows: The leveling chapter has been moved forward to Chapter 2, allowing instructors to introduce the simpler instruments before the more complex total stations; distance measurement has been moved to Chapter 3; total stations have been combined with electronic theodolites in Chapter 4 (optical theodolites have been moved to Appendix G); and satellite positioning has been revised and moved up in the presentation order to Chapter 7. Revision to the text and the addition of new material have been focused on the chapters describing topics where the technology and applications are still evolving. Revised text and new material are included in the following: Chapter 5, Total Stations—where the introduction has been re-written and the topics on combined total station/GPS instruments and ground-based lidar imag- ing have been revised and/or added; and Chapter 7—where the introductory topics were revised and the topics on wide area augmentation, CORS, OPUS, and real-time GPS networks were expanded. End-of-chapter problems have been expanded and refreshed. The websites given in selected chapters and in Appendix B have been updated and verified. The text continues to be divided into three parts:
As with the earlier editions of this text, material here is presented in a clear and logical fashion, a style that reflects the many years of surveying field experience and classroom instruction accumulated by the author.
iii
The following online supplements are available for instructors:
To access and download the above supplements, instructors need to request an instructor access code. Go to http://www.pearsonhighered.com/ric , where you can request an instructor access code. Within 48 hours after registering, you will receive a confirming e-mail. Once you have received your code, go to the site and log on for full instructions on downloading the materials you wish to use. Comments and suggestions about this text are welcomed by the author at barry. [email protected].
Barry F. Kavanagh
The author is grateful for the comments and suggestions received from those who adopted previous editions of this text and from the faculty of the Civil and Resources Engineering Technology School at Seneca College. In addition, particular thanks are due to Frank Corso, Illinois Central College; Deogratias Eustace, University of Dayton; Dennis Hughes, CS Mott Community College; Hesham Mahgoub, South Dakota State University; George Murgel, Boise State University; Dan Perry, Utah Valley University; Walid H. Shayya, Morrisville State College; Dianne Slattery, Southern Illinois University, Edwardsville; Brian L. Smith, University of Virginia; Eileen Young, Bristol Community College; Daniel Reed, Point Park University for their assistance with the seventh edition text reviews. The following surveying, engineering, and equipment manufacturers have provided generous assistance:
iv Preface
American Congress on Surveying and Mapping, Bethesda, Maryland American Society for Photogrammetry and Remote Sensing, Bethesda, Maryland Applanix, Richmond Hill, Ontario Bird and Hale, Ltd., Toronto, Ontario Canadian Institute of Geomatics, Ottawa, Ontario CST/Berger, Watseka, Illinois Environmental Systems Research Institute, Inc. (ESRI), Redlands, California Geomagnetic Laboratory, Geological Survey of Canada, Ottawa International Systemap Corp., Vancouver, British Columbia Laser Atlanta, Norcross, Georgia Leica Geosystems Inc., Norcross, Georgia
MicroSurvey International, Kelowna, British Columbia National Geodetic Survey (NGS), Silver Spring, Maryland OPTECH, Vaughn, Ontario Pacific Crest Corporation, Santa Clara, California Position Inc., Calgary, Alberta Sokkia Corporation, Olathe, Kansas Texas DOT, Austin, Texas Topcon Positioning Systems, Pleasanton, California Trimble, Sunnyvale, California Tripod Data Systems, Corvallis, Oregon U.S. Geological Survey, Denver, Colorado— John M. Quinn U.S. Geological Survey, Sioux Falls, South Dakota—Ron Beck
Contents xiii
FIELD NOTE INDEX Page Figure Title 38 2.15^ Leveling field notes and arithmetic check (data from Figure 2.14) 43 2.19 Profile field notes 44 2.21 Cross-section notes (municipal format) 45 2.22 Cross-section notes (highway format) 50 2.28 Survey notes for three-wire leveling 82 3.21 Taping field notes for a closed traverse 83 3.22 Taping field notes for building dimensions 103 4.6 Field notes for angles by repetition (closed traverse) 139 5.17 Field notes for total station graphics descriptors—MicroSurvey Software Inc. codes 141 5.18 Field notes for total station graphics descriptors—SOKKIA codes 159 6.3 Field notes for open traverse 160 6.4 Field notes for closed traverse 217 7.17 Station visibility diagram 220 7.18 GPS Field Log 246 8.3 Topographic field notes. (a) Single baseline (b) Split baseline 247 8.4 Original topographic field notes, 1907 (distances shown are in chains) 357 9.25 Field notes for control point directions and distances 358 9.26 Prepared polar coordinate layout notes 471 13.5 Property markers used to establish centerline 556 17.1 Example of the method of for recording sodding payment measurements 557 17.2 Field notes for fencing payment measurements 558 17.3 Example of field-book entries regarding removal of sewer pipe, etc. 559 17.4 Example of field notes for pile driving 606 D.1 Field book layout 607 D.2 Sample field notes for Project 1 (taping field notes building dimensions) 609 D.3 Sample field notes for Project 3 (traverse distances) 611 D.4 Sample field notes for Project 4 (differential leveling) 613 D.5 Sample field notes for Project 5 (traverse angles) 614 D.6 Sample field notes for Project 6 (topography tie-ins) 615 D.7 Sample field notes for Project 6 (topography cross sections) 617 D.9 Sample field notes for Project 6 (topography by theodolite/EDM) 618 D.10 Sample field notes for Project 6 (topography by total station) 621 D.11 Sample field notes for Project 7 (building layout) 658 G.17 Field notes for angles by direction 668 G.24 Stadia field notes
Part I, which includes Chapters 1–9, introduces you to traditional and state-of-the-art techniques in data collection, layout, and presentation of field data. Chapter 1 covers surveying fundamentals. Elevation determination is covered in the chapters on leveling (Chapter 2), total stations (Chapter 5), and satellite positioning (Chapter 7). Distance measurement, using both conventional taping techniques and electronic distance measurement (EDM), is covered in Chapter 3. Data presentation is covered in Chapters 5 and 8. Angle measurements and geometric analysis of field measurements are covered in Chapters 4–6. Horizontal positioning is covered in Chapter 7, and control for both data-gathering and layout surveys is covered in Chapter 9. Although most distance measurements are now done with EDM techniques, many applications still exist for steel taping on the short-distance measurements often found in construction layouts. Taping correction techniques can be found in Chapter 3 and Appendix F.
1
Chapter 1
Surveying
Fundamentals
2
Surveying is the art and science of taking field measurements on or near the surface of the Earth. Survey field measurements include horizontal and slope distances, vertical dis- tances, and horizontal and vertical angles. In addition to measuring distances and angles, surveyors can measure position as given by the northing, easting, and elevation of a survey station by using satellite-positioning and remote-sensing techniques. In addition to taking measurements in the field, the surveyor can derive related distances and directions through geometric and trigonometric analysis. Once a survey station has been located by angle and distance, or by positioning tech- niques, the surveyor then attaches to that survey station (in handwritten or electronic field notes) a suitable identifier or attribute that describes the nature of the survey station. In Chapter 8, you will see that attribute data for a survey station can be expanded from a sim- ple descriptive label to include a wide variety of related information that can be tagged specifically to that survey station. Since the 1980s, the term geomatics has come into popular usage to describe the computerization and digitization of data collection, data processing, data analysis, and data output. Geomatics includes traditional surveying as its cornerstone, but it also reflects the now-broadened scope of measurement science and information technology. Figure 8. shows a computerized surveying data model. This illustration gives you a sense of the diversity of the integrated scientific activities now covered by the term geomatics. The vast majority of engineering and construction projects are so limited in geographic size that the surface of the Earth is considered to be a plane for all X (easterly) and Y (northerly) dimensions. Z dimensions (height) are referred to a datum, usually mean sea level. Surveys that ignore the curvature of the Earth for horizontal dimensions are called plane surveys. Surveys that cover a large geographic area—for example, state or provincial
4 Chap. 1 Surveying Fundamentals
Surveys are usually performed for one of two reasons. First, surveys are made to collect data, which can then be plotted to scale on a plan or map (these surveys are called preliminary surveys or preengineering surveys ); second, field surveys are made to lay out dimensions taken from a design plan and thus define precisely, in the field, the location of the proposed construction works. The layouts of proposed property lines and corners as required in land division are called layout surveys ; the layouts of proposed construction features are called construction surveys. Preliminary and construction surveys for the same area must have this one characteristic in common: Measurements for both surveys must be referenced to a common base for X , Y , and Z dimensions. The establishment of a base for horizontal and vertical measurements is known as a control survey.
Control surveys establish reference points and reference lines for preliminary and construc- tion surveys. Vertical reference points, called benchmarks, are established using leveling surveys (Chapter 2) or satellite-positioning surveys (Chapter 7). Horizontal control surveys (Chapter 9) use any of a variety of measuring and positioning techniques capable of providing appropriately precise results; such surveys can be tied into (1) state or provincial coordinate grids, (2) property lines, (3) roadway centerlines, and (4) arbitrarily placed base- lines or grids. When using positioning satellites to establish or re-establish ground positions, the always-available satellite systems themselves can be considered as a control net—thus greatly reducing the need for numerous on-the-ground reference stations. At present, the only fully deployed satellite-positioning system is the United States’ Global Positioning System (GPS); the Russian system, called GLONASS, is about halfway to full deployment; and others plan to have positioning systems deployed within the next five or ten years—for exam- ple, Europe’s Galileo System, China’s Compass System, and an Indian positioning system.
Preliminary surveys (also known as preengineering surveys, location surveys, or data- gathering surveys) are used to collect measurements that locate the position of natural features, such as trees, rivers, hills, valleys, and the like, and the position of built features, such as roads, structures, pipelines, and so forth. Measured tie-ins can be accomplished by any of the following techniques.
The rectangular tie-in (also known as the right-angle offset tie) was once one of the most widely used field location techniques for preelectronic surveys. This technique, when used to locate point P in Figure 1.1(a) to baseline AB, requires distance AC (or BC), where C is on AB at 90° to point P, and it also requires measurement CP.
Sec. 1.5 Surveying Instruments 5
Polar tie-ins (also known as the angle/distance technique) are now the most (refer also to Section 1.4.4) widely used location technique (Chapters 4 and 5). Here, point P is located from point A on baseline AB by measuring angle u and distance AP [Figure 1.1(b)].
This technique is useful in specialized location surveys. Point P in Figure 1.1(c) is located to baseline AB either by measuring angles from A and B to P or by swinging out arc lengths AP and BP until they intersect. The angle intersection technique is useful for near- shore marine survey locations using theodolites or total stations set up on shore control points. The distance arc intersection technique is an effective method for replacing “lost” survey points from preestablished reference ties.
The second most widely used technique for locating topographic features utilizes direct posi- tioning techniques common to ground-scanning techniques (Chapter 5), satellite-positioning techniques (Chapter 7), and remote-sensing techniques (Chapter 8).
FIGURE 1.1 Location ties.
The instruments most commonly used in field surveying are (1) level and rod, (2) steel tapes, (3) theodolite, (4) total station, and (5) satellite-positioning receiver. The level and rod are used to determine differences in elevation and elevations in a wide variety of sur- veying, mapping, and engineering applications. Levels and rods are discussed in Chapter 2. Steel tapes are relatively precise measuring instruments and are used mostly for short measurements in both preliminary and layout surveys. Steel tapes and their use are dis- cussed in detail in Chapter 3. Theodolites (also called transits—short for transiting theodolites) are instruments designed for use in measuring horizontal and vertical angles and for establishing linear and