Surveying Glossary — Letter V

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VDOP

VDOP is a measure of the geometric quality of satellite positions used in GPS surveying that affects the accuracy of vertical positioning measurements.

Vector Data

Digital geographic information represented as discrete points, lines, and polygons with associated attributes.

Vertical Angle

A vertical angle is an angle of elevation or depression measured from the horizontal plane in surveying.

vertical circle reading

The measurement of vertical angles using the graduated circle on a surveying instrument to determine elevation differences and heights.

vertical datum

A reference surface or point used to measure vertical distances and elevations in surveying and mapping.

vertical datum shift

A change in the vertical reference system used to measure elevations and heights across a geographic area or survey project.

Visado de Campo

Ángulo horizontal máximo que puede ser observado desde un punto de estación en levantamientos topográficos y trabajos de agrimensura.

Volume Calculation

The process of determining the three-dimensional space occupied by excavated or filled material in surveying projects.

voxel

Yon volumetric pixel, a cubic unit of three-dimensional space used in surveying and spatial data representation.

voxel grid downsampling

A technique for reducing the resolution of 3D point cloud data by dividing space into cubic cells and aggregating points within each cell.

vrs

Vrs estas sistemo de pozicio-determinado uzanta satelitoj por preciza lokacio-mezurado en surlande aplikoj.