Geodetic Engineering Overview
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Questions and Answers

What is the main focus of Geodetic Engineering?

  • Designing buildings and infrastructure
  • Collection and measurement of spatial data (correct)
  • Developing software for engineering applications
  • Conducting environmental impact assessments

    • Which of the following is NOT a responsibility of Geodetic Engineers?

  • Designing transportation systems (correct)
  • Establishment of geodetic control networks
  • Development of spatial information systems
  • Collection of ground data

    • Why is the scientific processing of data important in Geodetic Engineering?

  • It ensures accuracy for creating maps and charts (correct)
  • It helps in building physical structures
  • It improves visual aesthetics of documents
  • It allows for recreational activities in surveying

    • What type of skills are developed through studies in Geodetic Engineering?

    <p>Business entrepreneurial skills</p> Signup and view all the answers

    Which of the following methods is commonly used in Geodetic Engineering?

    <p>Precision instruments for data gathering</p> Signup and view all the answers

    What is the main focus of geodetic surveying?

    <p>To consider the geoid-spheroidal shape of the Earth.</p> Signup and view all the answers

    Which type of surveying disregards the curvature of the Earth?

    <p>Plane Surveying</p> Signup and view all the answers

    What do control surveys primarily establish?

    <p>The positions of reference points for large geographical projects.</p> Signup and view all the answers

    Which type of survey is used to determine the boundaries of all parcels within a city?

    <p>Cadastral Surveys</p> Signup and view all the answers

    What is the primary purpose of project control surveys?

    <p>To establish reference points for limited geographic areas.</p> Signup and view all the answers

    What characterizes isolated surveys?

    <p>They involve parcels of land for various purposes under 1,500 hectares.</p> Signup and view all the answers

    Which is NOT a classification under control surveys?

    <p>Climatic Control Surveys</p> Signup and view all the answers

    What is the purpose of establishing control networks in surveying?

    <p>To create a basis for determining rectangular coordinates in a specified area.</p> Signup and view all the answers

    What is the approximate horizontal distance between two points with the same elevation called?

    <p>Horizontal distance</p> Signup and view all the answers

    What is the most probable value of the line measured for the surveying teams' data?

    <p>100.16 m</p> Signup and view all the answers

    Which method is NOT commonly used for determining horizontal distances in surveying?

    <p>Stereoscopic measurements</p> Signup and view all the answers

    What is the standard deviation of the measured values if one of the options is 0.37?

    <p>0.40</p> Signup and view all the answers

    Which angles represent the most probable values of observed angles at point 1?

    <p>87°31’, 140°24’, 132°05’</p> Signup and view all the answers

    What is the error in the observation of angles given the measurements?

    <p>1°20’</p> Signup and view all the answers

    What is the most probable value of ∠AOD as per the given options?

    <p>86°50’</p> Signup and view all the answers

    Which of the following is NOT a procedure in taping operations?

    <p>Using a digital clinometer</p> Signup and view all the answers

    What is the correction to apply when the measured distance is too long?

    <p>Subtract the correction</p> Signup and view all the answers

    What does the pace factor represent in the context of distance measurement?

    <p>The average number of steps taken</p> Signup and view all the answers

    What is the unit of measurement for the corrections due to temperature?

    <p>Meters</p> Signup and view all the answers

    How should you adjust for a tape that is too short during laying out distance?

    <p>Add the correction</p> Signup and view all the answers

    What formula is used to calculate the correction due to temperature?

    <p>Ct = C(To - Ts)l</p> Signup and view all the answers

    What does the coefficient of thermal expansion represent?

    <p>Material length change per degree</p> Signup and view all the answers

    When should you apply a correction due to temperature?

    <p>Any time distance is measured</p> Signup and view all the answers

    What is the maximum error in using a tape graduated to the nearest unit?

    <p>0.01 m</p> Signup and view all the answers

    What is the temperature correction per tape length for a temperature of 35°C against a standard of 25°C over a tape length of 50 m?

    <p>0.003 m</p> Signup and view all the answers

    What is the correct length of the tape during measurement when measured length is 30 m and temperature correction is 0.003 m?

    <p>30.003 m</p> Signup and view all the answers

    What is the temperature correction for a measured line of 2125.30 m at 15°C against a standard of 27°C?

    <p>-0.296 m</p> Signup and view all the answers

    How much should the correct length of the line be adjusted if the measured length is 2125.30 m and the temperature correction is -0.296 m?

    <p>2125.004 m</p> Signup and view all the answers

    What is the correct length of the tape if the measured length is 30 m and the calculated temperature correction is 0.003 m?

    <p>30.003 m</p> Signup and view all the answers

    If a surveyor has to lay out two points 120 m apart, what must be the adjusted distance if the temperature changes from 20°C to 27°C with a coefficient of thermal expansion of 0.0000116/°C?

    <p>120.007 m</p> Signup and view all the answers

    What is the formula used to calculate the temperature correction for the measured line?

    <p>Ct = C(T0 - Ts)L</p> Signup and view all the answers

    What will be the temperature correction per tape length if the temperature changes from 15°C to 27°C for a tape length of 50 m?

    <p>0.002 m</p> Signup and view all the answers

    Study Notes

    Geodetic Engineering Overview

    • Geodetic Engineering involves collecting and measuring spatial data using technology and scientific methods to create maps, plans, and spatial information systems.
    • Key functions include establishing geodetic control networks, data collection and analysis, developing surveying standards, and conducting research.

    Types of Surveying Works

    • Geodetic Surveying:
      • Considers the earth's shape (geoid-spheroidal) for high-precision measurements over large areas.
    • Plane Surveying:
      • Assumes a flat plane, disregarding earth's curvature for smaller and less precise surveys.

    Classification of Land Surveys

    • Control Surveys:
      • Determine horizontal and vertical positions for geodetic networks. Includes Geodetic Control Surveys and Project Control Surveys.
    • Cadastral Surveys:
      • Define the boundaries of land parcels within municipalities for registration.
    • Isolated Surveys:
      • For smaller land parcels (≤1,500 hectares) used for various purposes like agriculture and residential layouts.

    Horizontal Distance Measurement

    • Horizontal distance is the measurement between two points at equal elevation.
    • Common error in measurements necessitates correction methods.
    • Methods include pacing, taping, stadia measurements, and electronic distance measurements (EDM).
    • A synchronous online meeting on Horizontal Distance Measurements is scheduled for August 28, 2020.

    Corrections in Taping

    • Taping Method:
      • Simple distance measurement using graduated tape.
    • Correction Rules:
      • Tape too long: add correction; tape too short: subtract correction.
    • Temperature affects measurements; use the formula for temperature correction ( Ct = C (To - Ts) l ) to adjust measurements based on thermal expansion.

    Temperature Corrections

    • Coefficient of Thermal Expansion:
      • ( C = 0.0000116/oC )
    • Example Calculation: A 30 m long steel tape found to be 340.25 m at 35°C requires corrections to determine accurate measurements for both the tape length and the measured line.

    Example Problems

    • Compute Corrections:
      • Given temperature and measured line, apply the thermal expansion coefficient to calculate corrections.
    • Correct Lengths:
      • Adjust the tape length and the measured line length after applying corrections.

    Practical Applications

    • Conduct fieldwork to gather data on pacing factors and measuring tape usage, documenting conditions and units used.
    • Perform calculations for temperature corrections and create presentations based on fieldwork findings.

    Important Formulas

    • Relative Precision Calculation:
      • Use the formula ( \text{Relative Precision} = \frac{\text{Tape Distance}}{60} ) for comparisons.
    • Temperature Corrections:
      • ( Ct = C (To - Ts) L ) for measured line corrections.

    This summary provides a comprehensive look at the essentials of Geodetic Engineering and surveying practices, relevant calculations, and methodologies.

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    Description

    This quiz focuses on the principles and significance of Geodetic Engineering. You will explore various types of surveying works and understand the vital role of this engineering profession. It's an essential resource for students and professionals in the field.

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