Long-Term Subsidence Monitoring of City Areas at Nordic Latitudes using ERS SAR Data

Details Long-Term Subsidence Monitoring of City Areas at Nordic Latitudes using ERS SAR Data Long-Term Subsidence Monitoring of City Areas at Nordic Latitudes using ERS SAR Data

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..25l&link_type=abstract

Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish

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Scientific paper

The interferometric SAR (InSAR) technique may be a valuable tool for subsidence monitoring at different places of the Earth surface. Many results have been reported during the 1990 s where data from the ERS-1 and ERS-2 SAR sensors were used. This paper will present the ongoing long-term subsidence project in Norway, AO-1104, that are making use of ERS SAR data. The test area is located in the Oslo region in Norway. During the 1990 s, this area has undergone a lot of tunnel construction work, but also some smaller earthquakes have been registered in the region. Subsidence effects of several centimeters are connected to these events and documented by land surveillance. The changing topography from sea level to 700 m above sea level, the dominating coniferous forests outside the built-up areas, and the seasonal variations with snow, rain and temperatures below freezing at several months of the year, makes this project a real challenge when it comes to masking out the non-subsidence factors and interpreting the interferometric SAR signal. For this AO-project, a total of 45 ERS-1 and ERS-2 SAR raw data sets were obtained from ESA. The scenes are spanning a time interval from 1992 to 2000. Out of these scenes, 13 are from the winter, and 32 from the spring/summer/autumn period. The raw data sets are processed to single-look-complex SAR images using the phase preserving Extended Exact Transfer Function (EETF). Satellite orbit baselines are estimated using precise orbit data from ESA. Multiple differential interferograms are produced, as well as other products: coherence, lay-over and shadow masks and finally a simulated intensity map.

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