Official surveying (AV)

Officiall surveying (AV), also known as land register surveying, is used to create and maintain the Land Register Division. It secures land ownership and is the basis for the development and operation of Liechtenstein's geodata infrastructure (GDI).

As the office responsible for official cadastral surveying, the Surveying and Geoinformation Division works closely with the Federal Directorate of Cadastral Surveying (V+D). Most of the official cadastral surveying work is entrusted to patented surveyors. These surveyors' offices work in compliance with the legal framework, in accordance with the technical guidelines, the data catalog and the level of detail of the country.

The components of the official cadastral survey are

• The control points and boundary markers
• The data according to the official cadastral survey data catalog
• The plan for the Land Register Division and other extracts from the official cadastral survey
• Other technical documents

The data catalog is divided into 11 levels. These are thematically separated and can be freely linked and combined with each other or with other spatially relevant layers. The data can also be obtained from private parties in INTERLIS format or common CAD and GIS formats.

The first land register surveys were created after the introduction of the Surveying Act in 1945. Over the last 60 years, rapid technical development has taken place, which has manifested itself in different surveying standards.

In 2017, with the first survey of the Eschner Riet (Tentscha, Teilig, Rheinau), the last old cadastral area was included in the Land Register Division. This means that the "Klafter" (better square fathoms) area measurement has become obsolete in the Principality of Liechtenstein.

In 2018, the last two renewal areas (on the Rhine Valley side of Triesenberg and Malbun) were declared legally binding. This means that the entire country is now available in accordance with the latest regulations for official surveying (AV93/DM01).