Monitoring land subsidence in the Venice Lagoon with
SAR interferometry on trihedral corner reflectors
T. Strozzi, U. Wegmuller, C. Werner
Gamma Remote Sensing, Muri (BE), Switzerland
L. Tosi
Institute of Marine Sciences, CNR, Venezia,
Italy
P. Teatini
Dept. Mathematical Methods and Models for Scientific
Applications, University of Padova, Padova, Italy
ABSTRACT
Before the summer of 2007 58 square Trihedral Corner Reflectors (TCR) were
installed in salt marshes within the Venice Lagoon where anthropogenic
structures completely lack or few constructions are scattered at a distance
from one another too large to reliably resolve the radar phase ambiguity on
ERS and ENVISAT interferometric point target analysis. An optimal TCR
network has been established taking into account the location of
natural point targets in ERS and ENVISAT SAR interferometric analyses and
keeping to a value of about 1 km the maximum distance between the TCR or
between an artificial and the adjacent natural reflectors. In this
contribution we discuss the set-up of the TCR, their backscattering intensity
response on ENVISAT ASAR and TerraSAR-X images, and the approach followed
to measure the ground displacement in areas of particular interest within
the Venice Lagoon.
