What does LiDAR technology primarily use to measure distances?
A Light pulses
B Sound waves
C Radio waves
D Magnetic fields
LiDAR (Light Detection and Ranging) uses light pulses, typically in the form of lasers, to measure distances. These light pulses are emitted towards the Earth’s surface, and the time taken for the light to return is used to calculate precise distances, helping create detailed 3D maps.
Which system is used to define coordinates and provide geographic locations?
A LiDAR
B Total Station
C GPS
D GIS
GPS (Global Positioning System) is a satellite-based system used to determine geographic locations and coordinates. By receiving signals from multiple satellites, GPS provides accurate positioning data, which is essential in surveying, mapping, and geodetic applications.
Which technique is often used to measure the displacement of structures over time?
A Precision leveling
B Deformation monitoring
C Triangulation
D Bathymetric surveying
Deformation monitoring involves tracking changes in the position or shape of structures over time. It is crucial for detecting structural movement due to external factors like earthquakes, heavy traffic, or subsidence, ensuring safety and structural integrity.
What does a “geodetic datum” define in surveying?
A The shape of the Earth
B The elevation of buildings
C The angle of measurement
D A reference system for coordinates
A geodetic datum is a reference system used to define the location of points on the Earth’s surface. It provides a base for accurate surveying and mapping, ensuring consistency in spatial data by referencing the shape and size of the Earth.
What is the purpose of a cadastral survey?
A Mapping underground resources
B Determining land ownership and boundaries
C Measuring water depth
D Surveying forests
A cadastral survey is used to determine land boundaries, ownership, and legal descriptions. It is essential for property registration, taxation, and resolving land disputes, providing the official record of land parcels.
What is the primary use of photogrammetry in surveying?
A Measuring elevation
B Monitoring deformation
C Creating 3D models and maps
D Measuring water flow
Photogrammetry uses photographs taken from the air (drones or planes) to create accurate 3D models and maps. It combines photographic data with measurements from other sources like GPS to create highly detailed spatial representations of terrain and infrastructure.
Which tool is essential for measuring both horizontal and vertical angles in a survey?
A Theodolite
B GPS
C Laser scanner
D Compass
A theodolite is an instrument used for measuring both horizontal and vertical angles in surveying. It is essential for triangulation and other types of angle-based measurements in various surveys like land surveying and construction layout.
What does a “contour map” show?
A Underground utilities
B Land ownership boundaries
C Vegetation distribution
D Elevation and landforms
A contour map uses contour lines to represent the elevation of land above sea level. Each line represents a specific height, helping surveyors understand the slope, terrain features, and landforms, which is essential for construction and land planning.
What is a primary benefit of using drones in surveying?
A Expensive and slow
B Only suitable for urban areas
C High resolution aerial data
D Only for geological surveys
Drones provide high-resolution aerial data quickly and cost-effectively. They are equipped with cameras and sensors that capture detailed images and geospatial data, making them ideal for topographic surveys, land use mapping, and environmental monitoring.
What does precision leveling mainly measure?
A The vertical height differences
B The size of a construction site
C The distance between two points
D The slope of the land
Precision leveling is a technique used to measure the vertical height differences between two or more points with high accuracy. It is crucial in construction, engineering, and monitoring subsidence to ensure stability and proper design alignment.
What type of survey technique is used for collecting water depth information?
A Aerial surveying
B Geodetic surveying
C Digital mapping
D Hydrographic surveying
Hydrographic surveying involves measuring the physical characteristics of bodies of water, such as depth, water flow, and underwater features. It is essential for creating navigational charts, planning infrastructure like docks, and understanding aquatic environments.
What is the purpose of remote sensing in surveying?
A Collecting surface measurements
B Capturing images from satellites or aircraft
C Mapping geological layers
D Measuring building temperatures
Remote sensing involves capturing data from satellites or airborne sensors to gather information about the Earth’s surface. This technology is used for environmental monitoring, land use mapping, and disaster response, providing valuable data without direct physical contact.
Which of the following is used to measure the depth of water bodies?
A LiDAR
B GPS
C Bathymetric surveying
D Photogrammetry
Bathymetric surveying measures the underwater terrain, including depth, slope, and underwater features. It uses sonar technology and is vital for creating accurate maps of lakes, rivers, and oceans, assisting in navigation, construction, and environmental research.
What is the key application of 3D terrain modeling in surveying?
A Mapping soil types
B Measuring building heights
C Representing land surfaces in three dimensions
D Analyzing water quality
3D terrain modeling is used to create three-dimensional representations of land surfaces. This modeling is crucial for analyzing topography, planning construction, and simulating environmental changes, allowing for accurate visualization and decision-making.
Which type of survey involves creating detailed maps of underground resources?
A Subsurface surveying
B Geodetic surveying
C Topographic surveying
D Hydrographic surveying
Subsurface surveying focuses on mapping and analyzing underground resources, including soil composition, groundwater, and minerals. This type of survey is essential in construction, mining, and environmental studies, ensuring that underground features are accurately accounted for in project planning.