Homogenisation of the Austrian field of control points - preparatory work for a higher absolute accuracy in cadastre

摘要

Based on the points of EUREF all Austrian national control points will be calculated in the ETRS89 system using all measurements since 1920. The results will be used mostly to present the cadastre and other products in an international system best possible. Through the common recalculation of all measurements of one point from different epochs we get information about any ground motion within time. In the Western Austrian Provinces homogenisation is on the way and we do already have results. By means of APOS (Austrian Positioning Service) some points are controlled randomly to see whether the intended absolute accuracy of ±3cm (1 s) was reached. To homogenise the Austrian control points as a basis for the homogenisation of the cadastre and other GIS products will presumably take 2-3 years.