Broge, N.H.

F. Levinsen, J.

Sørensen, Carlo Sass

Building upon decades of experience with deformation monitoring from repeated precision leveling and GNSS measurements as well as more recent time series analyses of ERS, Envisat, and Sentinel-1 imagery, we are now working towards a nationwide mapping using Sentinel-1 Interferometric Wide Swath (IWS) mode data. The mission’s high spatio-temporal resolution yields multiple new potentials, one of which is the focus of this work: The establishment of an operational service for a nationwide monitoring of vertical land deformations in Denmark. We present deformation rates over selected test sites, obtained by applying Persistent Scatterer Interferometry to nearly two years of Sentinel-1 IWS data. They clearly demonstrate the potential in using such observations to identify areas undergoing rapid changes, so-called hotspots. Close collaborations with end-users show that the high-resolution information is relevant for, e.g., climate change adaptation and for optimizing renovation works of subsurface pipelines. Other relevant end-users represent road authorities, insurance companies, local authorities, etc. A nationwide mapping therefore is associated with great potentials for optimizing processes in both the public and private sectors. This will inevitably lead to significant economic savings. The test study makes up part of the foundation for establishing a nationwide service. As such, the results over the test sites will be presented to a broad range of end-users to identify their needs for the full-scale, technical solution. Furthermore, we investigate how to optimally exploit our network of in-situ measurements as well as a national uplift model to generate absolute deformation rates with a mm-accuracy. Combined with the close involvement of end-users, we focus on developing a service tailored to specific needs, which increases the probability of its implementation in both the public and private sectors.Presenting the results obtained on the road to setting up a nationwide deformation monitoring will clearly demonstrate the potentials arising with the continuous stream of Sentinel-1 IWS data

Fredenslund Levinsen, Joanna

Broge, Niels Henrik

Online Research Database In Technology

Approaching target: A service for nationwide deformation monitoring in Denmark using Sentinel-1

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 20, 2017Approaching target: A service for nationwide deformation monitoring in Denmarkusing Sentinel-1F. Levinsen, J.; Sørensen, Carlo Sass; Broge, N.H.Publication date:2017Document VersionPeer reviewed versionLink back to DTU OrbitCitation (APA):F. Levinsen, J., Sørensen, C. S., & Broge, N. H. (2017). Approaching target: A service for nationwidedeformation monitoring in Denmark using Sentinel-1 [Sound/Visual production (digital)]. Fringe 2017 Workshop,Helsinki, Finland, 05/06/2017Approaching target: A service for nationwide deformation monitoring in Denmark using Sentinel-1 J. F. Levinsen1 (jofle@sdfe.dk), N. H. Broge2, C. S. Sørensen1,3 1) Agency for Data Supply and Efficiency, Danish Ministry of Energy, Utilities and Climate, Copenhagen, Denmark 2) Danish Ministry of Energy, Utilities and Climate, Copenhagen, Denmark 3) DTU Space, National Space Institute, Technical University of Denmark, Kongens Lyngby, Denmark Outline Why? Motivation What? Activities …and then what? Road map The ”why”: Motivation • Small country w/ long coastline and little topography • Issues:  Climate changes   Management of groundwater levels  Soil management   Coastal urbanisation  • Vertical ground motions yield:  Imminent risk of flooding   Broken pipes  Explosion of pipes  … The ”why”: Need for deformation monitoring Long-term experience with: Precision leveling + GNSS  Precision leveling (1885): Cycles of 1 yr, 3 yrs, 50 yrs GNSS: Permanent (1998) as well as semi-permanent (2007) stations with cycles of 1 yr, 3 yrs The ”why”: Need for deformation monitoring Long-term experience with: InSAR ERS-2 (1995-2001) Contains modified Copernicus Sentinel data 2014 - 2016 Various test studies with ERS, EV, S1 data. Activities: • QC over selected sites • Build up experience • Demonstrate potentials  Optimal climate change adaptation ↔ high spatial coverage + hotspot detection: possible with InSAR, particularly Sentinel-1! Ref: PPO.Labs, NORUT, NGU (2017) The ”why”: Motivation Summary: • Imminent risk of flooding. • InSAR ideal screening tool.  Copernicus program: • Sentinel-1: High spatio-temporal resolution and spatial coverage. • Data acquisition ensured until 2030. • Free and open data policy.   Great potential for nationwide deformation monitoring! Ref: PPO.Labs, NORUT, NGU (2017) Contains modified Copernicus Sentinel data 2014 - 2017 The ”what”: Activities Requirements for establishing operational service for nationwide deformation monitoring in Denmark? Process:  •Which technique is optimal for DK, and why? •How to update, and why? •How to include leveling, GNSS, corner reflectors? •How to expand network of corner reflectors? •Costs for service? •Processing: Esbjerg, Aarhus, first large-scale deformation map. How? Identify technical approach  (status: completed) •Point density? Error estimate? Data format? Type of visualisation? …? Why? Identify end-user requirements (status: on-going) How much? Cost-benefit analyses  (status: on-going) •If yes: EU tender (2018) When? Basis of decision    (status: November) The ”what”: Results • Integration of multitude of methods • PSI and SBAS • Utilisation of all relevant geometries • On-going R&D to resolve long-wavelength components: GIA signal and seasonal signal  • Preliminary, large-scale result: • PSI: Oct. 2014 – Mar. 2017 • Most infrastructure resolved • Islands and mainland well-connected • Expected errors: ± 3 mm/yr        En route to nationwide solution Contains modified Copernicus Sentinel data 2014 - 2017 The ”what”: Results Platform for dissemination • Web-interface essential • Must be profiled to end-user needs   Work-in-progress! Contains modified Copernicus Sentinel data 2014 - 2017 Ref: PPO.Labs, NORUT, NGU (2017) The ”what”: Results Corner reflectors • Test and permanent set-ups • Quality control • Demonstration • Integration • Geo-referencing Mount for GNSS receiver Leveling bolts Road map: Potentials with Sentinel-1 •Simple to confine AOI and avoids multiple, cross-border computations (ex: SNGMS). •Exploitation of regions facing similar issues (ex: climate changes). •Exploitation of other countries’ expertise/ knowledge. Cross-border collaborations •Inclusion of potential end-users to specify technical requirements Maximising output Q: How did DK make it this far? A: The possibility to establish operational services   Thank you! Agency for Data Supply and Efficiency Danish Ministry of Energy, Utilities and Climate The presentation contains modified Copernicus  Sentinel data 2014-2017 The authors would like to acknowledge ESA and the Copernicus programme for making data available, and PPO.Labs, NORUT, and NGU for processing and expert advice. 

http://orbit.dtu.dk/ws/files/134459438/presentation242.pdf

Approaching target: A service for nationwide deformation monitoring in Denmark using Sentinel-1

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology

Online Research Database In Technology