Surveying Glossary — Letter V
Βασικοί όροι στη δημοσιογραφική τοπογραφία και τη γεωχωρική τεχνολογία.
VDOP is a dimensionless factor that describes the degradation of vertical positioning accuracy in GNSS surveying based on satellite geometry relative to the observer.
Vector data represents geographic features as discrete points, lines, and polygons with precise coordinate values and associated attributes, forming the foundation of digital surveying and GIS applications.
Vegetation canopy filtering is a data processing technique used in surveying to remove or reduce the effects of tree canopy and dense vegetation on elevation measurements and positioning accuracy.
A vertical angle is the angle of inclination or declination measured from the horizontal plane to a line of sight, used to determine elevation differences and heights in surveying operations.
A measurement of the vertical angle or zenith distance from a surveying instrument's telescope to a target point, used to determine elevation differences and calculate vertical distances in surveying operations.
A vertical datum is a reference surface, typically mean sea level or a geoid model, used to establish elevations and heights in surveying and mapping projects.
A vertical datum shift is the transformation of vertical coordinate values from one reference system to another, accounting for differences in elevation datums used in surveying and mapping projects.
A specialized surveying method that determines the volume of earthwork, stockpiles, excavations, and other three-dimensional features through precise measurement and computational analysis.
A voxel is a three-dimensional pixel representing a single data point in a 3D spatial grid, widely used in surveying to store and analyze volumetric data from laser scanning and point cloud processing.
A computational technique that reduces the resolution and data volume of three-dimensional point clouds by aggregating multiple voxels into larger spatial units while preserving spatial relationships.
A network-based GNSS correction technique that generates virtual ground stations from a network of reference stations to provide precise real-time positioning data to rovers within a defined service area.