The precise analysis of GNSS observation data is based upon a variety of metadata from different sources, including station and satellite metadata. A high evaluation quality must be ensured by the consistency and integrity of these metadata.

The station and satellite metadata are currently maintained in ASCII based files that makes the extraction of key information used for the data evaluation difficult. To get rid of the restrictions caused by the file based metadata management, the Operational Data Center (ODC) group of the GFZ developed a Sensor Meta Information System (SEMISYS) for the central, format independent and validated storage of station and satellite metadata based upon client/server technology (PHP, JavaScript) and a relational database (PostgreSQL).

The system is available under


Markus Bradke
IT Specialist
M. Eng. Markus Bradke
Space Geodetic Techniques
Building A 17, Room 10.09
14473 Potsdam
+49 331 288-1182