INVESTIGADORES
EUILLADES Leonardo Daniel
artículos
Título:
Atmospheric Corrections in Interferometric Synthetic Aperture Radar Surface Deformation - a Case Study of the City of Mendoza, Argentina
Autor/es:
SEBASTIAN BALBARANI; PABLO A. EUILLADES; LEONARDO D. EUILLADES; FRANCESCO CASU; NATALIA RIVEROS
Revista:
Advances in Geosciences (ADGEO)
Editorial:
Copernicus GmbH
Referencias:
Año: 2013 vol. 35 p. 105 - 113
ISSN:
1680-7340
Resumen:
Differential interferometry is a remote sensing
technique that allows studying crustal deformation produced
by several phenomena like earthquakes, landslides, land subsidence and volcanic eruptions. Advanced techniques, like
small baseline subsets (SBAS), exploit series of images acquired by synthetic aperture radar (SAR) sensors during a
given time span.
Phase propagation delay in the atmosphere is the main
systematic error of interferometric SAR measurements. It affects differently images acquired at different days or even at
different hours of the same day. So, datasets acquired during
the same time span from different sensors (or sensor configuration) often give diverging results. Here we processed
two datasets acquired from June 2010 to December 2011 by
COSMO-SkyMed satellites. One of them is HH-polarized,
and the other one is VV-polarized and acquired on different
days.
As expected, time series computed from these datasets
show differences. We attributed them to non-compensated atmospheric artifacts and tried to correct them by using ERAInterim global atmospheric model (GAM) data. With this
method, we were able to correct less than 50 % of the scenes,
considering an area where no phase unwrapping errors were
detected. We conclude that GAM-based corrections are not
enough for explaining differences in computed time series,
at least in the processed area of interest. We remark that no
direct meteorological data for the GAM-based corrections
were employed. Further research is needed in order to understand under what conditions this kind of data can be used.