Improvement and extension of ETRS 89 in Latvia and Lithuania based on the NKG 2003 GPS campaign

摘要

The present ETRS 89 realizations in Latvia and Lithuania are based on the EUREF-BAL'92 campaign, which has an estimated accuracy of the same level as the original EUREF 89 campaign (class C). Latvia and Lithuania wish to replace their EUREF-B AL '92 realization with an ETRS 89 realization based on the NKG 2003 GPS campaign. The NKG 2003 GPS campaign was carried out in GPS-week 1238 (September 28th to October 4th 2003) under the framework of the Nordic Geodetic Commission (NKG). The campaign included mainly permanent stations in the Nordic and Baltic area as well as Island, Greenland and Svalbard.