Podcast
Questions and Answers
Which instrument was designed for leveling work and consisted of a horizontal beam with a plumb line suspended from its center?
Which instrument was designed for leveling work and consisted of a horizontal beam with a plumb line suspended from its center?
What was the primary function of the Vernier?
What was the primary function of the Vernier?
Which instrument was perfected by Heron of Alexandria and was used for leveling and sighting?
Which instrument was perfected by Heron of Alexandria and was used for leveling and sighting?
What is the SI unit for plane angles?
What is the SI unit for plane angles?
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What is the prefix for 1000 in the metric system?
What is the prefix for 1000 in the metric system?
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Which of the following is NOT a type of surveying measurement?
Which of the following is NOT a type of surveying measurement?
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What is the primary difference between direct and indirect measurement in surveying?
What is the primary difference between direct and indirect measurement in surveying?
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What was the purpose of the Roman Groma?
What was the purpose of the Roman Groma?
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What is the formula for calculating the residual in a measurement?
What is the formula for calculating the residual in a measurement?
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What is the formula for calculating the probable error of the mean?
What is the formula for calculating the probable error of the mean?
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What is the formula for calculating the relative precision of a single measurement?
What is the formula for calculating the relative precision of a single measurement?
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What is the function of the rear tape man in a taping party?
What is the function of the rear tape man in a taping party?
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Which of the following is an indirect method of distance measurement?
Which of the following is an indirect method of distance measurement?
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What is the meaning of "stride" in pacing?
What is the meaning of "stride" in pacing?
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Which of the following is NOT a method for measuring horizontal distances?
Which of the following is NOT a method for measuring horizontal distances?
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What is the difference between a pedometer and a passometer?
What is the difference between a pedometer and a passometer?
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What is the signal used to indicate the rod should be faced towards the line of sight?
What is the signal used to indicate the rod should be faced towards the line of sight?
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Which of the following is NOT a common mistake in leveling?
Which of the following is NOT a common mistake in leveling?
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What signal does the instrumentman use to indicate a turning point has been established?
What signal does the instrumentman use to indicate a turning point has been established?
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What is the signal used to tell the rodman to reverse the rod?
What is the signal used to tell the rodman to reverse the rod?
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Which of the following is NOT a source of error in leveling related to the instrument?
Which of the following is NOT a source of error in leveling related to the instrument?
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Which signal is used to indicate that a surveyor should come in or assemble?
Which signal is used to indicate that a surveyor should come in or assemble?
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Which of the following is NOT a source of error in leveling related to the rod?
Which of the following is NOT a source of error in leveling related to the rod?
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What is the signal used to tell the rodman to raise or lower the target?
What is the signal used to tell the rodman to raise or lower the target?
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What type of survey is conducted for the purpose of planning expansions in a city?
What type of survey is conducted for the purpose of planning expansions in a city?
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Which type of survey is used to determine the position of underground workings?
Which type of survey is used to determine the position of underground workings?
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Which of these instruments is credited to Lippershey?
Which of these instruments is credited to Lippershey?
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Which type of survey is most closely related to measuring the flow of streams?
Which type of survey is most closely related to measuring the flow of streams?
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What is the main purpose of a Topographic Survey?
What is the main purpose of a Topographic Survey?
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Which of these is NOT a type of survey mentioned in the provided text?
Which of these is NOT a type of survey mentioned in the provided text?
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What is the main difference between Plane Surveying and other types of surveying?
What is the main difference between Plane Surveying and other types of surveying?
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What is the primary function of Cadastral surveys?
What is the primary function of Cadastral surveys?
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What is the role of a backsight (BS) in differential leveling?
What is the role of a backsight (BS) in differential leveling?
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What does 'vertical exaggeration' refer to in profile leveling?
What does 'vertical exaggeration' refer to in profile leveling?
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In the context of trigonometric leveling, how is the vertical distance (VD) calculated?
In the context of trigonometric leveling, how is the vertical distance (VD) calculated?
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What is a benchmark (BM) in leveling operations?
What is a benchmark (BM) in leveling operations?
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Which of the following statements about profile leveling is inaccurate?
Which of the following statements about profile leveling is inaccurate?
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What determines the direction of a line in surveying?
What determines the direction of a line in surveying?
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What is indicated by the formula $h = 0.0675K^2$ in relation to refraction?
What is indicated by the formula $h = 0.0675K^2$ in relation to refraction?
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What is the formula for correcting the measured length when using a tape that is too long?
What is the formula for correcting the measured length when using a tape that is too long?
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What is the formula for calculating the correction due to slope for gentle slopes (less than 20%)?
What is the formula for calculating the correction due to slope for gentle slopes (less than 20%)?
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What is the coefficient of thermal expansion for steel used in the correction due to temperature formula?
What is the coefficient of thermal expansion for steel used in the correction due to temperature formula?
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What is the formula for calculating the correction due to tension?
What is the formula for calculating the correction due to tension?
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What is the formula for calculating the correction due to sag?
What is the formula for calculating the correction due to sag?
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Which of the following methods is used for erecting a perpendicular to a line using a tape?
Which of the following methods is used for erecting a perpendicular to a line using a tape?
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According to the provided text, how is the horizontal distance calculated in a slope measurement?
According to the provided text, how is the horizontal distance calculated in a slope measurement?
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What is the primary purpose of leveling methods in surveying?
What is the primary purpose of leveling methods in surveying?
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Flashcards
Surveying
Surveying
Art and science of measuring and determining positions on earth.
Plane Surveying
Plane Surveying
Type of surveying treating the earth as a flat surface.
Cadastral Surveys
Cadastral Surveys
Surveys that determine property boundaries in urban/rural areas.
Construction Surveys
Construction Surveys
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Hydrographic Surveys
Hydrographic Surveys
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Photogrammetric Surveys
Photogrammetric Surveys
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Astrolabe
Astrolabe
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Telescope
Telescope
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Transit
Transit
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Semicircumferentor
Semicircumferentor
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Dioptra
Dioptra
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Gunter's Chain
Gunter's Chain
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Direct measurement
Direct measurement
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Meter
Meter
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Radian
Radian
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Significant figures
Significant figures
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Breaking tape
Breaking tape
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Correction due to incorrect tape length
Correction due to incorrect tape length
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Correction due to slope
Correction due to slope
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Ct formula
Ct formula
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Coefficient of thermal expansion
Coefficient of thermal expansion
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Correction due to tension
Correction due to tension
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Correction due to sag
Correction due to sag
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Erecting perpendicular lines
Erecting perpendicular lines
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Residual
Residual
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Probable Error (PE)
Probable Error (PE)
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Relative Error
Relative Error
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Pacing
Pacing
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Pedometer
Pedometer
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Tachymetry
Tachymetry
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Head Tape Man
Head Tape Man
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Optical Rangefinder
Optical Rangefinder
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Two-Peg Test
Two-Peg Test
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Curvature and Refraction
Curvature and Refraction
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Bench mark (BM)
Bench mark (BM)
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Backsight (BS)
Backsight (BS)
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Foresight (FS)
Foresight (FS)
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Turning Point (TP)
Turning Point (TP)
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Profile Leveling
Profile Leveling
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Vertical Exaggeration
Vertical Exaggeration
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Raise (or lower) target
Raise (or lower) target
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Come in (signal)
Come in (signal)
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Plumb the rod
Plumb the rod
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Establish a turning point
Establish a turning point
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This is a turning point
This is a turning point
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Wave the rod
Wave the rod
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Face the rod
Face the rod
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Reverse the rod
Reverse the rod
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Study Notes
Introduction to Surveying
- Surveying is the art and science of determining angular and linear measurements to establish the form, extent, and relative position of points, lines, and areas on or near the earth's surface.
Two General Classifications of Surveying
- Plane surveying: Assumes the Earth is flat, used for limited distances and areas.
- Geodetic surveying: Considers the Earth's spheroidal shape, used for large areas.
Types of Surveys
- Cadastral surveys: Determine property lines and boundaries in urban and rural areas.
- City surveys: Surveys of urban areas for planning, expansions, improvements, and map preparation.
- Construction surveys: Provide data for construction projects, including grades, reference lines, dimensions, and building locations.
- Forestry surveys: Data for forest management, including grades, and mensuration.
- Hydrographic surveys: Surveying bodies of water, including mapping shorelines, charting shapes of areas underwater, and measuring stream flow, important for navigation, water resource development, flood control, and recreation.
- Industrial surveys: Applying surveying techniques to industries to accurately measure and layout machines, shipbuilding, and aircraft assembly.
- Mine surveys: Determine underground mine excavations, surface structures, boundaries of mining claims, calculate excavated volumes, establishing lines and grades for mining projects.
- Photogrammetric surveys: Utilize photographs from aircraft or ground stations for mapping and measurements.
- Route surveys: Used for highways, railways, pipelines, canals, transmission lines for planning, design, and construction.
- Topographic surveys: Determine the shape of the ground and locations of natural and artificial features.
Development of Surveying Instruments
- Astrolabe: An early measuring instrument.
- Telescope: Used for astronomical observations.
- Transit: Used to measure and lay off angles, and establish lines of sight.
- Semicircumferentor: An early surveying instrument used for angle measurement.
- Plane table: A board attached to a tripod for leveling and measuring horizontal and vertical angles.
- Dioptra: An instrument for leveling and measuring angles, perfected by Heron.
- Roman Groma: An instrument used for aligning points.
- Libella: An instrument used to determine the horizontal plane.
- Vernier: An auxiliary scale for precise measurement of fractional parts of a main scale.
- Diopter: Another instrument for leveling and measuring angles.
- Compass: Used for determining directions and angles.
- Gunter's Chain: Early instrument for measuring distances.
- Chorobates: Instrument used for leveling work.
- Merchet: A device for time and meridian measurement.
Units of Measurements
- SI units for plane angles is the radian.
- Prefixes like kilo, mega, centi, milli, micro and nano are used to denote multiples or sub-multiples of units.
Significant Figures
- Rules for determining significant figures, including zeroes.
Types of Errors
- Systematic error: Errors consistently having the same sign and magnitude.
- Accidental error: Errors from external factors.
- Mistakes: Errors due to carelessness and poor judgment.
- Blunders: Large mistakes.
Sources of Errors in Surveying
- Instrument Errors: Errors arising (or introduced) from imperfections in instruments.
- Natural Errors: Errors from Natural phenomena like refraction, temperature, etc...
- Personal Errors: Errors caused by human limitations in observation, measurement, or execution.
Surveying Measurements
- Direct measurement: Comparison of measured quantity to a standard unit.
- Indirect measurement: Measuring a quantity by its relation to other known quantities.
Measurement of Horizontal Distances
- Pacing: Counting the number of steps (paces) for distance.
- Pace factor: Calculating the distance of one pace.
- Pedometer: A mechanical counter for paces.
- Passometer: A mechanical counter that counts paces strapped to the leg.
Measurement of Vertical Distances
- Direct or spirit leveling: Determining elevations of points by a series of leveling instrument setups.
- Reciprocal leveling: Establishing elevation differences between points that are far apart.
- Profile leveling: Obtaining elevations at specified intervals along a line.
- Trigonometric leveling: Calculating elevations using trigonometric relationships and measurements .
- Stadia leveling: Combining direct and trigonometric leveling for preliminary surveys or rough leveling.
- Barometric leveling: Determining elevations by measuring atmospheric pressure variations.
- Cross-section leveling: Creating short profile views (cross-sections) at regular intervals.
- Borrow-pit leveling: Determining relative elevations in excavation areas for calculating earthwork volumes.
Types of Levels
- Dumpy level: Widely used direct leveling instrument.
- Wye level: A leveling instrument with detachable telescopes.
- Builder's level: Used for building construction when precise measurement isn't required.
- Automatic level: Popular for conventional leveling work due to ease and speed of operation.
Measurement of Angles and Directions
- True meridian: Geographic north-south direction.
- Magnetic meridian: Direction given by freely suspended magnetic needle.
- Grid meridian: Reference direction aligned parallel with rectangular coordinates used in plane surveying.
- Assumed meridian: An arbitrarily selected reference line.
Units of Angular Measurement
- Degree: A unit in the sexagesimal system; a circle is divided into 360 degrees.
- Grad: A unit in the centesimal system; a circle is divided into 400 grads.
- Mil: A unit commonly used for military applications.
- Radian: One radian is equal to 180°/π, approximately 57.296 degrees.
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Description
Explore the fundamentals of surveying, including its definitions, classifications, and various types of surveys. Delve into the differences between plane and geodetic surveying and understand the applications of cadastral, city, construction, forestry, and hydrographic surveys.