Analysis of mutual positions of geodetic observation points situated on the Śnieżka mountain based on GPS and total station technologies

On the Śniezka mountaintop in the Giant Mts. there are situated three GPS points. The first one situated on the Polish side (SNIE), a former fundamental trigonometric station, is an epoch site maintained by the Department of Geodesy and Photogrammetry AU Wroclaw that has been used for geodynamic research connected with the EXTENDED SAGET, CERGOP and CEGRN international programmes for the past 10 years. Since 2001 two other GPS sites are located on the Czech side of the Śniezka Mt. One of them (SNE1), placed on the Czech fundamental trigonometric point, serves for an occasional GPS epoch measurement point and the other one (SNEC) belongs to a permanent GPS observatory point maintained by the Institute of Rock Structure and Mechanics AS CR, Prague. Since GPS observations have been performed in 2001 and 2002 simultaneously within a few international research programmes, this fact enabled to transfer geodynamic observations from one site to another one, e.g. from the epoch site SNIE point to the permanent GPS observatory SNEC. From this viewpoint, several day observations were carried out at the same time on all three GPS points SNIE, SNEC and SNE1 in 2002. Afterwards range and angle measurements with precise Leica TCA 2003 Total Station were performed to verify and mutually link relative positions of all three GPS points.