If you would like to know more about the GNSS satellites and data, the following interactive tools provide you a great opportunity. Interested in more details?
Here is brief introduction that should help you to understand what these tools are for.
GNSS (Global Navigation Satellite Systems) basic objective is the precise positioning in real or near real time. However, GNSS data have proved to be useful in many applications such as deformation monitoring, snow depth determination, soil moisture estimation, and atmospheric sounding. In this work, we are interested in estimating the path delay of the GNSS signal, which is then used to provide accurate estimates of the precipitable water vapor (PWV) in the atmosphere.
Before installing the TRYAT stations in Germany, France, and Italy (panel A), we used the GNSS data collected and processed by the GFZ. There is a dense GNSS network in Germany as the map of panel F shows.
In order to estimate the delay, we need the satellite precise position (X, Y, Z). By clicking on panel B, the coordinates of, for example, 24 GPS satellites can be explored. You could by clicking on panel C show time series of the parametrs of a specific station. The data include variations of the azimuth and elevation angles with respect to a specific satellite, and the slant and zenith path delays.
To show time series of atmospheric parameters: PWV, pressure, and temperature, click on panel D. By clicking panel E, you can also select a station and show all data with the corresponding satellite. This include the elevation, azimuth angles, the slant path delay, and the zenith delay.
And to show the PWV from the entire network for a specific time, click panel F. This network can be used to obtain grids of PWV every 30 minutes. A time sequence of GNSS-based PWV maps interpolated at a spatial resolution of 12 km is shown in panel G. We can also run atmospheric models to produce PWV grids at a 3 km spatial resolution as seen in panel H.
For further details, please refer to the manuscripts/videos under the menu LEARNING MATERIALS. Should you have any further questions, do not hesitate to contact us.