RPLS Surveying Principles and Methods 1 — Questions and Answers
Question 1: Which of the following is the most accurate method for determining elevations during a survey?
- Hand leveling with a sight level.
- Using a dumpy level and stadia rod.
- Differential leveling with an automatic level. (Correct answer)
- Measuring elevations using a tape and plumb bob.
Correct answer: Differential leveling with an automatic level.
Differential leveling is the most accurate and widely used method for determining precise elevations in surveying. It involves using an automatic level to establish a series of horizontal lines of sight and reading a graduated rod held at various points. This method systematically measures vertical differences between points, allowing for high precision in elevation determination compared to less precise methods.
Question 2: In a traverse survey, which of the following steps should be performed to ensure the accuracy of the data?
- Measure all angles in one direction only.
- Double-check all linear measurements and angles. (Correct answer)
- Assume distances between points are equal unless otherwise stated.
- Use GPS for angles and conventional equipment for distances.
Correct answer: Double-check all linear measurements and angles.
A traverse survey involves measuring a series of connected lines and angles to determine the positions of points. To ensure the accuracy of the data, it is crucial to meticulously double-check all measurements, both linear distances and angles. This redundancy helps identify and correct mistakes, leading to a more reliable and precise survey outcome.
Question 3: What is the primary purpose of a control survey?
- To measure distances and angles for small projects.
- To establish reference points for future surveys. (Correct answer)
- To calculate property boundaries based on deeds.
- To verify the dimensions of a constructed building.
Correct answer: To establish reference points for future surveys.
Control surveys establish a network of precisely determined points with known coordinates and elevations. These points serve as fundamental reference points for all subsequent surveys within an area, ensuring consistency and accuracy across different projects. They provide a stable and reliable framework upon which detailed surveys can be built.
Question 4: Which type of surveying method is best suited for mapping large, uneven terrains?
- Plane surveying.
- Topographic surveying. (Correct answer)
- Construction surveying.
- Hydrographic surveying.
Correct answer: Topographic surveying.
Topographic surveying is specifically designed to measure and map the natural and artificial features of a land area, including its relief (elevation changes). This makes it ideal for large, uneven terrains where detailed elevation data and contour lines are necessary to accurately represent the landscape. Other surveying types serve different primary purposes.
Question 5: When using a Total Station to measure distances, which of the following factors could affect the accuracy of the readings?
- The type of soil on the site.
- The weight of the equipment.
- Atmospheric conditions like temperature and pressure. (Correct answer)
- The speed at which measurements are taken.
Correct answer: Atmospheric conditions like temperature and pressure.
Total Stations use electromagnetic waves to measure distances, and the speed of these waves is affected by the refractive index of the atmosphere. Changes in atmospheric conditions, such as temperature, pressure, and humidity, alter the refractive index, which can introduce errors into distance measurements. Surveyors must input these atmospheric parameters or apply corrections to achieve accurate results.
RPLS Surveying Principles and Methods 1
Which of the following is the most accurate method for determining elevations during a survey?