Linking InSAR-based deformation monitoring with the national geodetic infrastructure in Denmark
Abstract
With the launch of Sentinel-1 as part of the European Copernicus Earth Observation program, the use of InSAR data throughout Europe is rapidly growing. This is greatly supported by the multiple efforts towards establishing nationwide ground deformation services taking place in e.g. Norway, the Netherlands and Denmark. The services will be based on Sentinel-1 data and will be full, free and open.
The effort in Denmark is led by the Danish governmental Agency for Data Supply and Efficiency. Part of the motivation is the coupling between InSAR and geodesy to enable the use of the data in fulfilling the agency's responsibility for maintaining the geodetic height network. Here, we present the efforts towards reaching this goal. The SDFE have several years of experience with InSAR data and in 2018 acquired the first-ever nationwide deformation map over Denmark. It was generated by TRE Altamira who applied the SqueeSARTM algorithm to the full Sentinel-1 dataset, i.e. acquisitions from 2014 - 2018 in all available relative orbits (13). The deformation map was updated in 2019. The data have been made freely available for interested end-users in Denmark, such as engineering companies and local and national authorities. Applications are e.g. infrastructure monitoring and the optimisation of basis of decisions regarding climate change adaptation. As a mapping authority, one of the agency's goals is to datum connect the InSAR data using our network of permanent GNSS stations and tide gauges. This is expected to be possible by co-locating the instruments with reflectors (active/ passive) and then integrating the deformation rates from InSAR with those from the instruments whose locations and velocities are known with up to mm-accuracy. Having InSAR rates expressed in a geodetic reference frame is expected to allow for using the data to maintain the geodetic infrastructure. Further, the access to a nationwide deformation map will allow for optimising the planning of leveling campaigns as they can be focused in areas with deformations. The presentation will outline the work towards coupling InSAR and geodesy. A focus point will be some of the actions taken, such as Sentinel-1-based validation exercises of corner reflectors and Compact Active Transponders as well as efforts to ensure the co-location.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G11B0510B
- Keywords:
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- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 1211 Non-tectonic deformation;
- GEODESY AND GRAVITY;
- 1240 Satellite geodesy: results;
- GEODESY AND GRAVITY;
- 1241 Satellite geodesy: technical issues;
- GEODESY AND GRAVITY