Byte från lokalt referenssystem till SWEREF 99 : fallstudie Gävle
On February 1st 2007 the National land survey of Sweden changed reference system to the Swedish realisation of European Terrestrial Reference System 1989 (ETRS 89), SWEREF 99. The reason why municipalities, authorities and other users should use SWEREF 99 instead of other reference systems is because the advantages outweigh the disadvantages. The change of reference system should be implemented in order to facilitate the exchange of information inside Sweden and so that the users of GNSS receivers (Global Navigation Satellite System) can refer to the municipality coordinate system easier.The aim with this 10 point thesis, on C-level, is to suggest solutions for municipalities and organizations that are changing reference system.The study results in a supervision for municipalities’ work procedures at a change of reference system, and show what they should consider during measuring of complement points to underlie their transformation. Geographic information is accessible in a large number of administrations and companies in the municipality. To avoid missing any organization at a change of reference system, an investigation of which data should be transformed has been made. A surveillance of two transformation functions in ArcMap and one in GTRANS are compared with GNSS technique measured coordinates for comparison divergence between the transformations in a future change of reference system.Measurements with GNSS technique are made to improve the present reference system in the municipality. The measurements are made because coordinates shall be present in SWEREF 99 as well as the from-system. These points shall keep a high accuracy with respect to equipment, method of measuring etc. The result from the transformations in ArcMap and GTRANS minimize the tensions and deformations in the municipal horizontal geodetic control network in different ways in relation to the coordinates. The numbers of known points in relationship for transformations are larger in ArcMap than GTRANS, a comparison in a small area in central Gävle shows that ArcMaps results are better than GTRANS.
School:Högskolan i Gävle
Source Type:Master's Thesis
Keywords:geomatics reference system sweref
Date of Publication:11/15/2007