Surveying principles and techniques
Expert-defined terms from the Professional Certificate in Topographic Surveying course at London School of Business and Administration. Free to read, free to share, paired with a globally recognised certification pathway.
Surveying Principles and Techniques Glossary #
Surveying Principles and Techniques Glossary
Absolute Accuracy #
The closeness of a measurement to the true value. It is essential in surveying to ensure that measurements are as accurate as possible to avoid errors in the final survey results.
Alignment #
The process of positioning surveying instruments in a straight line to establish control points for accurate measurements. Proper alignment is crucial for ensuring the accuracy of survey data.
Baseline #
A fixed reference line used in surveying to measure distances and angles. Baselines are often established in topographic surveys to provide a basis for accurate measurements.
Contour Lines #
Lines on a map connecting points of equal elevation. Contour lines are used in topographic surveys to depict the shape and elevation of the land, providing valuable information for construction projects and land development.
Distance Measurement Techniques #
Various methods used in surveying to measure distances accurately, such as tape measure, electronic distance measurement (EDM), and total stations. Each technique has its advantages and limitations, depending on the surveying project's requirements.
Elevation #
The height of a point above a reference datum, usually sea level. Elevation data is crucial in topographic surveys for creating accurate maps and models of the terrain.
Field Notes #
Detailed records of surveying observations, measurements, and calculations made in the field. Field notes are essential for documenting survey data and ensuring accuracy in subsequent surveying tasks.
Horizontal Control #
Establishing accurate reference points in the horizontal plane for surveying measurements. Horizontal control is essential for ensuring the alignment and accuracy of survey data.
Intersection #
A surveying technique used to determine the position of a point by measuring angles from two known points. Intersections are commonly used in topographic surveys to locate features on the terrain accurately.
Leveling #
The process of measuring height differences between points on the ground to determine elevation changes. Leveling is essential in topographic surveys for creating accurate contour maps and profiles of the terrain.
Map Scale #
The ratio between distances on a map and actual distances on the ground. Map scale is crucial in topographic surveys for accurately representing the terrain's features and dimensions.
Orthophoto #
A geometrically corrected aerial photograph that accurately represents the terrain's features without distortion. Orthophotos are commonly used in topographic surveys for mapping and analysis purposes.
Parcel Boundary #
The legal boundary lines defining the limits of a property or land parcel. Surveyors use parcel boundaries in topographic surveys to determine property ownership and establish land-use boundaries.
Quadrant Bearing #
A method of expressing directions in surveying using compass directions (north, east, south, west) and angles measured clockwise from the north direction. Quadrant bearings are commonly used in topographic surveys for orientation and navigation.
Remote Sensing #
The process of collecting data from a distance using aerial photography, satellites, LiDAR, and other technologies. Remote sensing is essential in topographic surveys for obtaining accurate and up-to-date information about the terrain.
Survey Control #
Established reference points or markers used to control the accuracy and reliability of survey measurements. Survey control points are critical in topographic surveys for ensuring consistency and precision in the survey data.
Topographic Map #
A detailed map showing the physical features of the terrain, such as elevation, contour lines, vegetation, water bodies, and man-made structures. Topographic maps are essential in surveying for planning and design purposes.
Vertical Control #
Establishing accurate reference points in the vertical plane for surveying measurements. Vertical control is essential in topographic surveys for determining elevations and creating accurate topographic maps of the terrain.
Wetland Delineation #
The process of identifying and mapping wetland boundaries for regulatory and environmental purposes. Wetland delineation is often required in topographic surveys to assess the impact of land development projects on wetland ecosystems.
X, Y, Z Coordinates #
Three-dimensional coordinates used in surveying to represent the position of points on the Earth's surface. X, Y, Z coordinates are essential in topographic surveys for locating features accurately in three-dimensional space.
Yield Mapping #
The process of collecting and analyzing data on crop yields in agricultural fields. Yield mapping is often used in topographic surveys to assess the productivity of farmland and optimize crop management practices.
Zone System #
A method of dividing large survey areas into smaller zones for more efficient data collection and analysis. Zone systems are commonly used in topographic surveys to organize survey tasks and ensure comprehensive coverage of the terrain.