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VENEZIA

Subsidence monitoring service in the lagoon of Venice for regional administrative and water authorities

Definion and implementation of a land subsidence monitoring service in the Lagoon of Venice based on the combined used of differential SAR interferometry (DInSAR) and Interferometric Point-Target Analysis (IPTA) integrated with ground based levelling surveys and GPS measurements.

 
Project References
 Name VENEZIA
 Title Subsidence monitoring service in the lagoon of Venice for regional administrative and water authorities
 Programme DUP (Data User Programme)
 Theme Land
 Cost €250k
 Type Service Demonstration
 Status Completed (19/10/2001 – 10/2003)
 Sensors ENVISAT : ASAR
ERS-1/2 : SAR
 
Project Description
 Objectives

The main objectives of VENEZIA have been to define and implement a land subsidence monitoring service in the Lagoon of Venice based on the combined used of differential SAR interferometry (DInSAR) and Interferometric Point-Target Analysis (IPTA) integrated with ground based levelling surveys and GPS measurements. In the lagoon of Venice, traditionally subsidence rates are monitored with varying temporal and spatial frequency depending on the ground measurement networks.

The use of satellite derived subsidence measurements helps to improve the spatial and temporal frequency to every 25m and at least 35 days (repeat pass orbits in the case of ERS and ASAR) in the case of DInSAR and IPTA. The combination of ground and satellite measurements helps to confirm the accuracy and cross validation of the satellite derived measurements as well as providing improved and more detailed maps of subsidence in the Lagoon and surrounding area.

A new development for subsidence monitoring in the Lagoon of Venice, has been the use of IPTA processing and the generation of subsidence maps. DInSAR is limiting for subsidence mapping in rural areas due to temporal phase de-correlation. However through the use of long time series SAR images, phase stable point targets within a scene can be identified. These are usually returns from man-made structures or buildings. In the Lagoon and surrounding area, these are distributed in both urban and rural areas. So there is further potential to improve the spatial coverage for subsidence mapping. An important aspect of the study has been the development of the IPTA processing chain and removal of atmospheric artefacts that cause within scene and between scene random phase noise signal variations.

 
 Results ERS and ENVISAT SAR Interferometry to measure land subsidence
VENEZIA Final Report
 
 
Project Consortium
 Prime contractor GAMMA : GAMMA REMOTE SENSING A.G.
 Subcontractors CNR-ISMAR VE : Italian National Research Council (CNR) - Institute for Marine Science (ISMAR) - Venice Research Section: Marine and Coastal Systems
 
User Partnership
 Users CVN : Consortium Venezia Nuova
MAV : Venice Water Authority
 
Contact Points
 Project Manager Tazio Strozzi
GAMMA REMOTE SENSING
Thunstrasse 130
3074 Muri BE
Switzerland
Tel: +41 91-8261406
Fax: +41 31-9517008
Email: strozzi@gamma-rs.ch
 Technical Officer Frank Martin Seifert
European Space Agency - ESRIN D/EOP-SEP
via Galileo Galilei
I-00044 Frascati (Roma)
ITALY
Tel.: +39 06-941.80560
Fax: +39 06-941.80552
Email: frank.martin.seifert@esa.int
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