Lägesändring

Lägesändring is a term used in geodesy, surveying and cadastral work to describe a change in the spatial position of a point, feature or boundary within a geospatial reference framework. The change can involve the horizontal position, and in some contexts may be tied to updates in the reference system or datum used for coordinate values.

Causes of lägesändring vary. Natural processes such as tectonic movements, soil settlement or land uplift can alter the actual position of points over time. Practical measurements can yield revised coordinates for already established points, or a boundary may be redefined and relocated in the official records. In cadastral practice, lägesändring often results from new surveys, re-sampling of markers, or updates to align with a national or regional control network.

Determination and documentation typically rely on modern surveying methods, including GNSS (global navigation satellite systems) and total stations, tied to a network of control points. A lägesändring is usually accompanied by a geodetic adjustment or datum transformation to ensure consistency with the national reference frame. The new coordinates, the effective date, the measurement basis, and the sources are recorded, and the change is reflected in official maps and cadastral registers.

Implications of a lägesändring can include updates to property boundaries in cadastral records, revisions of mapped features, and potential effects on planning, land administration and legal documentation. Institutions such as national mapping or land registration authorities typically handle the formal approval, recording, and dissemination of the change.