It is necessary to understand the geo-tectonic recent movements and landslides and mining subsidence of the earth surface and the earth crust movements as a natural continuation of dynamic tectonic processes. Determined movements by means of using the geodetic terrestrial or satellite navigation technologies give information about displacements in concrete time information on the base of repeated geodetic measurements in concrete time intervals. 3D deformation investigation of the point of the monitoring station stabled in the Košice-city and the Košice Depression territory in East Slovakia is the main task of the presented paper. The obtained results are transformed into GIS in a frame of the environmental protection.
The terrestrial and GPS measurements are realised on points of the geodetic network (GN) localised in the Kosice Depression (Slovakia) (Fig.1). The aim of these measurements is determining recent geotectonic movements, landslides and subsidence of the earth surfaces caused by underground mine activity in the urban agglomeration of Kosice-city. The terrestrial and GPS measurements are periodically realised twice a year(spring and autumn). Altogether, 20points GN are measured by means of using the trigonometric and GPS kinematics method. The determined GN points are solved by double GPS vector technology always regarding two reference points, i.e. three GPS receivers are used for measurements. The main tectonic fault in the Kosice Depression, according to which two expressive geological faults of the Earth ground blocks should move, is assumed in the north south direction along the river Hornad. The secondary tectonic faults of smaller extent are in the direction perpendicular to the Hornad fault, i.e. in the east-west direction. These secondary tectonic faults are mutually parallel. The landslides are expected in the territory of košicka Nova Ves closed to košice-city. The mining subsidence is occurred in the Kosice-Bankov forest park, which is situated in the magnesite underground mine košice -Bankov(Fig.1).
The GPS receivers ASHTECH: ProMARK X-CM and the total stations TOPCON: GTS 6A were used for Satellite and terrestrial measurements. The non- linear rotary matrix method was applied to the adjustment. After transformation, the coordinates were consecutively adjusted by an adjustment with constraints (Frajt & Misovic 2001).
The Kosice Depression GN can be adjusted by two ways. If we consider datum parameters as absolutely accurate and we do not include them into an adjustment process, the adjustment with constraints is considered in this case. In fact, those datum parameters are also determined with a concrete accuracy that has an influence on an accuracy of adjustment parameters except for measurement accuracy. In this case a network can be adjusted by a free adjustment with consideration of datum parameters. Regarding the applied confinement adjustment in the Kosice Depression GN a theoretic procedure of this adjustment is presented, which is the most convenient for our national geodetic (Sedlak 2000, Sedlak et al.2002).
The least mean square method is chosen as an estimate principle, and the inverse solution as a mathematical principle (Gauss-Markov model), which is a standard procedure in an adjustment of the Kosice Depression GN.
