Glossary

Phase shift measurement is a surveying technique that determines distances and positions by analyzing the phase difference between transmitted and reflected electromagnetic signals.

Photogrammetry is the science and technology of obtaining reliable information about physical objects and the environment through the process of recording, measuring, and interpreting photographic images.

A high-resolution 3D point cloud generated from overlapping aerial or terrestrial photographs using photogrammetric processing to create detailed spatial data for surveying and mapping applications.

A preliminary three-dimensional point cloud generated during photogrammetric processing that contains relatively few calculated points, used as an intermediate step before dense cloud generation.

A distinctive feature or marked location visible in overlapping aerial or terrestrial photographs used to establish geometric relationships and coordinate connections between multiple images in photogrammetric processing.

A specialized surveying technique that establishes precise horizontal and vertical positioning of pipelines for design, construction, maintenance, and regulatory compliance purposes.

Pix4D Photogrammetry is a professional software platform that processes digital images captured by drones or cameras to generate precise 3D models, orthomosaics, and point clouds for surveying and mapping applications.

A detailed graphical representation of a surveyed parcel of land showing boundaries, dimensions, structures, and legal descriptions used for property documentation and conveyance.

A weighted string or cord suspended from a fixed point to establish a vertical reference line for surveying and construction measurements.

A plumb line is a simple surveying instrument consisting of a weight suspended from a string or wire used to establish a true vertical reference line for accurate measurements and construction layout.

A large collection of three-dimensional coordinate points captured by surveying instruments to represent the surface geometry of objects, terrain, or structures.

Point cloud classification is the process of automatically or manually assigning semantic labels to individual 3D points in a point cloud dataset to categorize them by object type, surface material, or functional purpose.

A computational technique that removes erroneous or extraneous data points from three-dimensional point cloud datasets to improve accuracy and clarity in surveying measurements.

Point cloud registration is the process of aligning multiple point clouds from different scans or sensors into a single coordinate system to create a unified 3D model.

Point cloud registration is the process of aligning multiple point clouds in a common coordinate system to create a unified, georeferenced 3D dataset.

The process of converting three-dimensional point cloud data acquired from laser scanning or photogrammetry into a structured Building Information Model for design, documentation, and facility management.

A GPS/GNSS surveying technique that processes satellite data after fieldwork is complete to achieve precise positioning with centimeter-level accuracy.

A surveying method using unmanned aerial vehicles equipped with GNSS receivers that processes positioning data after flight to achieve centimeter-level accuracy without real-time corrections.

Parts Per Million (PPM) is a unit of measurement expressing the ratio of one part of a substance to one million parts of the whole, commonly used in surveying to specify measurement accuracy and instrument precision.

Precise Point Positioning (PPP) is a GNSS technique that uses corrections from a single receiver to achieve centimeter-level or better positioning accuracy without requiring ground control stations or base stations.

Precise Point Positioning (PPP) is a GNSS technique that uses satellite orbit and clock corrections to achieve centimeter-level positioning accuracy without requiring a reference ground station.

Precision refers to the consistency and repeatability of measurements, while accuracy measures how close those measurements are to the true value.

The prism constant is a correction factor representing the offset distance between a reflective prism's physical center and its effective optical center used in electronic distance measurement.

A prism reflector is a retroreflective optical device used in surveying to reflect laser signals back to total stations and other electronic measuring instruments with high precision.

A surveyed point marking the boundary intersection of adjoining land parcels, established through precise measurements and legal documentation.

A legal survey that establishes and documents the exact boundaries, dimensions, and improvements of a property parcel based on recorded deed descriptions and field measurements.

QGIS is a free, open-source Geographic Information System software that enables surveyors and GIS professionals to capture, analyze, and visualize spatial data from various sources.

A specialized surveying discipline that establishes precise horizontal and vertical control along railway corridors to support design, construction, and maintenance of rail infrastructure.

Random error is an unpredictable deviation in measurement results caused by uncontrollable variables that affects surveying accuracy equally in all directions.

A range pole is a straight, slender surveying rod, typically 2 meters long, marked with alternating colored bands and used to establish sight lines and mark survey points in the field.

A GNSS surveying method that combines the accuracy of static positioning with reduced observation times, typically requiring 5-30 minutes of data collection depending on baseline length and satellite geometry.

Raster data is a digital image format composed of a grid of pixels or cells, each containing a single value representing geographic or spatial information used in surveying and mapping applications.

Unprocessed measurements and observations collected directly from surveying instruments in the field before adjustment, analysis, or conversion to final coordinates.

A mathematical model of Earth's shape used as a reference surface for geodetic measurements and coordinate system definitions in surveying.

A reflective target is a surveying accessory featuring retroreflective material designed to enhance the accuracy and range of electronic distance measurement instruments by returning light signals to their source.

Reflectorless EDM measurement is an electronic distance measurement technique that calculates distances by analyzing the intensity and return time of infrared light reflected from natural surfaces, eliminating the need for reflective prisms.

Reflectorless measurement is a surveying technique that uses infrared light to measure distances directly to natural surfaces without requiring a prism or reflector target.

Remote sensing is the science and technology of obtaining information about objects or areas on Earth's surface without physical contact, using satellite imagery, aerial photography, and sensor data.

Resection is a surveying method that determines the position of an unknown point by measuring angles from that point to three or more known reference points.

Revit Survey Integration is the process of importing and linking surveying data from field instruments into Autodesk Revit BIM software to establish accurate site coordinates and ground conditions for architectural and construction projects.

A right of way survey is a specialized land surveying procedure that establishes, documents, and marks the legal boundaries and physical extent of property rights granted for public or private passage, utilities, or infrastructure corridors.

RiSCAN PRO is advanced scanning software that processes and manages 3D laser scan data from terrestrial and mobile scanning systems for surveying and mapping applications.

Root Mean Square (RMS) is a statistical measure used in surveying to quantify the magnitude of measurement errors and assess the accuracy of survey data by calculating the square root of the average of squared deviations.

Root Mean Square Error (RMSE) is a statistical measure used in surveying to quantify the accuracy of measurements by calculating the square root of the average of squared differences between observed and true values.

A specialized surveying process that determines the horizontal and vertical alignment, dimensions, and physical characteristics of roads and transportation corridors for design, construction, and maintenance purposes.

A motorized surveying instrument that automatically tracks and measures distances and angles to a reflective prism, enabling remote operation and increased efficiency in field surveying.

Real-Time Kinematic positioning is a satellite-based surveying technique that provides centimeter-level accuracy by transmitting GPS/GNSS corrections in real-time to a rover receiver.

RTK drone surveying is an advanced geospatial method combining unmanned aerial vehicles with Real-Time Kinematic positioning technology to achieve centimeter-level accuracy in mapping and surveying applications.

Real-time kinematic GNSS positioning is a surveying technique using satellite signals and ground-based correction stations to achieve centimetre-level accuracy in real-time field measurements.

A real-time kinematic GNSS positioning technique that applies tidal corrections and vertical datum transformations to achieve accurate surveying measurements in tidal zones and coastal areas.