Surveying Glossary — Letter S

A satellite constellation is a coordinated system of multiple satellites orbiting Earth that work together to provide continuous global coverage for positioning, navigation, and surveying applications.

A satellite-based augmentation system that enhances the accuracy and integrity of GNSS positioning by transmitting correction signals and system status information to ground receivers.

A numerical correction applied to surveying measurements to account for the difference between ground distances and map or grid distances due to map projection, elevation, or instrument calibration effects.

Scan resolution is the precision and fineness of detail at which a 3D laser scanner or imaging device captures spatial data points during surveying operations.

Scan to BIM is a surveying and modelling process that converts point cloud data from laser scanning into structured Building Information Models for design, construction, and facility management.

Scanner Field of View (FOV) is the angular extent or total area that a surveying scanner can detect and measure from a single instrument position.

Scanner range accuracy is the degree of precision with which a laser scanner measures the distance from the instrument to surveyed objects or terrain surfaces.

Structure from Motion is a photogrammetric technique that reconstructs three-dimensional models and spatial data from multiple overlapping photographs taken from different positions without requiring direct distance measurements.

Shapefile format is a geospatial vector data structure developed by Esri that stores geometric location and attribute information for surveying and mapping data in a set of related files.

Spatial resolution is the ability of a surveying instrument or sensor to distinguish and precisely locate individual objects or features at the smallest measurable distance on the Earth's surface.

A surveying procedure that establishes and marks the precise locations of planned structures, utilities, or property boundaries on the ground by transferring design coordinates to physical points.

A surveying methodology that quantifies measurement precision and accuracy by calculating the statistical dispersion of repeated observations around their mean value.

A coordinate system that divides the United States into zones, projecting latitude and longitude onto a flat plane to provide accurate local surveying and mapping measurements.

A surveying method using stationary GNSS receivers at fixed locations to determine precise coordinates through extended observation periods.

A specialized surveying discipline that uses precision measurement techniques to detect, quantify, and document structural movements, deformations, and settlements in buildings, bridges, dams, and infrastructure over time.

Structure from Motion (SfM) is a photogrammetric technique that reconstructs three-dimensional models and spatial data from a series of overlapping two-dimensional images captured from different viewpoints.

A subdivision survey is a detailed land survey that divides a parcel of real property into smaller lots, creating legal boundaries and establishing lot lines for residential, commercial, or industrial development.

Survey accuracy standards are established specifications and tolerances that define the acceptable levels of precision and error in surveying measurements and deliverables.

A survey blunder is a significant error in surveying measurements caused by mistakes in procedure, instrument misuse, or faulty judgment that renders survey data unreliable and typically requires re-measurement.

A portable electronic device that automatically records and stores measurement data from surveying instruments during fieldwork operations.

A rechargeable or disposable power source that supplies electrical energy to surveying instruments such as total stations, GNSS receivers, and laser levels during field operations.

Survey metadata comprises descriptive information about surveying projects, including data collection methods, equipment specifications, accuracy standards, dates, locations, and personnel details that ensure data integrity and reproducibility.

A permanent or semi-permanent physical marker installed at a surveyed point to establish and preserve the location of property boundaries, control points, or reference stations for future surveying work.

A wireless communication device that transmits surveying data between field instruments and base stations using radio frequency technology.

Survey redundancy is the inclusion of excess measurements beyond the minimum required to determine a position, ensuring accuracy verification and error detection in surveying operations.

A mobile computing device designed for field surveyors to collect, process, and manage geospatial data in real-time during land surveying operations.

Survey tolerance is the acceptable range of error or deviation in measurements and positional accuracy allowed in surveying work before data is considered unacceptable or requires remeasurement.

A three-legged portable stand used to support surveying instruments such as theodolites, total stations, and levels at a fixed height and position during field measurements.

A consistent, predictable bias in measurements that occurs in the same direction and magnitude under identical conditions, reducible through calibration and correction procedures.