viitepiste

Viitepiste, or reference point, is a defined point on the ground that serves as an anchor for measurements, mapping, and construction. Its coordinates and, if relevant, height are known in a specific reference system. A viitepiste provides a stable basis for tying measurements to a coordinate framework, enabling consistent position determination and orientation across surveys and projects.

Viitepisteet can be natural or artificial. Natural points may be solid, stable landmarks, while artificial points are markers such as concrete pillars or steel pins installed for measurement purposes. They can be permanent or temporary, and are often part of a broader network of control points that establish a geodetic reference framework for a region or project.

In practice, a network of viitepisteet forms the basis for geospatial work. Surveying instruments are oriented to these points, and all subsequent measurements are referenced to them. This allows coordinate data to be transformed between local project coordinates and larger datums or global systems, ensuring consistency and interoperability of maps, plans, and GIS data.

Uses of viitepisteet include land surveying, construction layout (stakeouts for buildings, roads, or infrastructure), and cartographic or GIS work. Establishing reliable viitepisteet is essential for accuracy, repeatability, and quality control in surveying and engineering projects.

See also: geodetic control, datum, stakeout, benchmarking.