Water vapor is one of the most influential greenhouse gases, even it fills only 0-5% of the volume of the atmosphere. Around 50% of the total atmospheric water vapor is located in the boundary layer, which is about 1.5km above the surface, and less than 5-6% of the water vapor can be found above 5km. There are several ground based methods for detecting the atmospheric water vapor. The master project is focused on observations using water vapor radiometer and Global Navigation Satellite Systems (GNSS). An analysis of measurements of two different water vapor radiometers and the GNSS station, located at GFZ, was done.