The HydroKIT is a research project carried out at the Institute of Photogrammetry and Remote Sensing (IPF) and the Geodetic Institute Karlsruhe (GIK). The research aims at monitoring of the water vapor in the earth’s neutral atmosphere. Water vapor affects microwave signals from spaceborne transmitters with an unknown delay. In this work, GNSS and InSAR signals will be investigated for water vapor estimation. Integrated water vapor is  accurately  estimated at the spatially-sparse GNSS stations. On the other hand, an atmospheric phase image of high spatial resolution is extracted from InSAR measurements covering the same area. Our objective is the fusion of pointwise GNSS and wide-area InSAR results for accurate high spatially resolved water vapor maps. The study is done on the area of Upper Rhine Graben where high dense permenant GNSS stations are available. Envisat as well as ERS-1/-2 data are employed for InSAR analyses. Research results will be evaluated and validated using external data sources (i.e., Weather data, Weather Models).

Monitoring of atmospheric water vapor by the analysis of GNSS signals and SAR data