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What is the main focus of Geodetic Engineering?
Which of the following is NOT a responsibility of Geodetic Engineers?
Why is the scientific processing of data important in Geodetic Engineering?
What type of skills are developed through studies in Geodetic Engineering?
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Which of the following methods is commonly used in Geodetic Engineering?
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What is the main focus of geodetic surveying?
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Which type of surveying disregards the curvature of the Earth?
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What do control surveys primarily establish?
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Which type of survey is used to determine the boundaries of all parcels within a city?
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What is the primary purpose of project control surveys?
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What characterizes isolated surveys?
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Which is NOT a classification under control surveys?
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What is the purpose of establishing control networks in surveying?
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What is the approximate horizontal distance between two points with the same elevation called?
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What is the most probable value of the line measured for the surveying teams' data?
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Which method is NOT commonly used for determining horizontal distances in surveying?
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What is the standard deviation of the measured values if one of the options is 0.37?
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Which angles represent the most probable values of observed angles at point 1?
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What is the error in the observation of angles given the measurements?
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What is the most probable value of ∠AOD as per the given options?
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Which of the following is NOT a procedure in taping operations?
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What is the correction to apply when the measured distance is too long?
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What does the pace factor represent in the context of distance measurement?
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What is the unit of measurement for the corrections due to temperature?
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How should you adjust for a tape that is too short during laying out distance?
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What formula is used to calculate the correction due to temperature?
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What does the coefficient of thermal expansion represent?
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When should you apply a correction due to temperature?
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What is the maximum error in using a tape graduated to the nearest unit?
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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?
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What is the correct length of the tape during measurement when measured length is 30 m and temperature correction is 0.003 m?
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What is the temperature correction for a measured line of 2125.30 m at 15°C against a standard of 27°C?
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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?
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What is the correct length of the tape if the measured length is 30 m and the calculated temperature correction is 0.003 m?
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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?
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What is the formula used to calculate the temperature correction for the measured line?
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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?
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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
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Geodetic Surveying:
- Considers the earth's shape (geoid-spheroidal) for high-precision measurements over large areas.
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Plane Surveying:
- Assumes a flat plane, disregarding earth's curvature for smaller and less precise surveys.
Classification of Land Surveys
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Control Surveys:
- Determine horizontal and vertical positions for geodetic networks. Includes Geodetic Control Surveys and Project Control Surveys.
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Cadastral Surveys:
- Define the boundaries of land parcels within municipalities for registration.
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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
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Taping Method:
- Simple distance measurement using graduated tape.
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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
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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
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Compute Corrections:
- Given temperature and measured line, apply the thermal expansion coefficient to calculate corrections.
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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
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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.
